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• question about permut-by-sorting

  - by davit-datuashvili

  hi i have following question from book introduction in algorithms second edition there is such problem suppose we have some array A int a[]={1,2,3,4} and we have some random priorities array P={36,3,97,19} we shoud permut array a randomly using this priorities array here is pseudo code P ERMUTE -B Y-S ORTING ( A) 1 n ? length[A] 2 for i ? 1 to n do P[i] = R ANDOM(1, n 3 ) 3 4 sort A, using P as sort keys 5 return A and result will be permuted array B={2, 4, 1, 3}; please help any ideas i have done this code and need aideas how continue import java.util.*; public class Permut { public static void main(String[]args){ Random r=new Random(); int a[]=new int[]{1,2,3,4}; int n=a.length; int b[]=new int[a.length]; int p[]=new int[a.length]; for (int i=0;i<p.length;i++){ p[i]=r.nextInt(n*n*n)+1; } // for (int i=0;i<p.length;i++){ // System.out.println(p[i]); //} } } please help

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• Need help finding a unique value in array

  - by bardockyo

  My code is complete minus one little flaw. It searches the array and prints out which values are unique, however it always counts the first entry as unique even if it is followed by the same value. Can anyone look at my code and tell me which part is messing this up because it is driving me crazy. #include <stdio.h> #define size 7 int main(void) { int array1[size], target, answer, found, x, k, prev, count =1, i; printf("Please input %d integers: ", size); scanf("%d", &target); for(x = 0; x < size; x++) { scanf("%d", &array1[x]); } prev = array1[0]; for (i = 1; i < size; i++) { if (array1[i] == prev) { count++; } else { if (count < 2) printf("%d=%d\n", prev, count); prev = array1[i]; count = 1; } } if (count < 2) { printf("%d=%d\n", prev, count); } return 0; }

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• correct method "get next value"

  - by kapec

  Hello!! i need your help! this is my code, it not so good as i wander - it is not working. i have not idea anymore. </code>// need to get next parameter static double getParametr(){ Scanner scanner = new Scanner(System.in); param = scanner.nextDouble(); return param; } .......... ................ if (i==1){ System.out.println("vvedite storoni pryamougolnika: "); Shape parA = new Rectangle(); parA.a = Shape.getParametr(); --- this is ok double aa = parA.a; Shape parB = new Rectangle(); parB.b = Shape.getParametr(); ------ this is no work!!! double bb = parB.b; Rectangle rec = new Rectangle(aa, bb); arrayFigur[i] = rec.area(); } how fix mistake?

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• huge C file debugging problem

  - by valdo

  Hello all. I have a source file in my project, which has more than 65,536 code lines (112,444 to be exact). I'm using an "sqlite amalgamation", which comes in a single huge source file. I'm using MSVC 2005. The problems arrives during debugging. Everything compiles and links ok. But then when I'm trying to step into a function with the debugger - it shows an incorrect code line. What's interesting is that the difference between the correct line number and the one the debugger shows is exactly 65536. This makes me suspect (almost be sure in) some unsigned short overflow. I also suspect that it's not a bug in the MSVC itself. Perhaps it's the limitation of the debug information format. That is, the debug information format used by MSVC stores the line numbers as 2-byte shorts. Is there anything can be done about this (apart from cutting the huge file into several smaller ones) ?

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• What's best performance way to constantly change image on WP7?

  - by AlRodriguez

  I'm trying to make my own type of remote desktop for WP7. I have a WCF service that returns an image on what's on the target machine's screen. Here's the WCF Server Code: // Method to load desktop image Bitmap image = new Bitmap( ViewSize.Width, ViewSize.Height ); Graphics g = Graphics.FromImage( image ); g.CopyFromScreen( Position.X, Position.Y, 0, 0, ViewSize ); g.Dispose( ); return image; // Convert image to byte[] which is returned to client using ( MemoryStream ms = new MemoryStream( ) ) { Bitmap image = screenGrabber.LoadScreenImage( ); image.Save( ms, ImageFormat.Jpeg ); imageArray = ms.ToArray( ); } Here's the code for the WP7 client: MemoryStream stream = new MemoryStream( data ); BitmapImage image = new BitmapImage( ); image.SetSource( stream ); BackgroundImage.Source = image; The BackgroundImage variable is an Image control. I'm noticing this freeze on the emulator after a short while, and will eventually crash from an OutOfMemoryException. This is already pretty slow ( images show up a good half second later than what's on the screen ), and I'm wondering if there's a better/faster way of doing this? Any help would be great. Thanks in advance.

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• JPA entity relations are not populated after .persist()

  - by Tomik

  Hello, this is a sample of my two entities: @Entity public class Post implements Serializable { @OneToMany(mappedBy = "post", fetch = javax.persistence.FetchType.EAGER) @OrderBy("revision DESC") public List<PostRevision> revisions; @Entity(name="post_revision") public class PostRevision implements Serializable { @ManyToOne public Post post; private Integer revision; @PrePersist private void prePersist() { List<PostRevision> list = post.revisions; if(list.size() >= 1) revision = list.get(list.size() - 1).revision + 1; else revision = 1; } So, there's a "post" and it can have several revisions. During persisting of the revision, entity takes a look at the list of the existing revisions and finds the next revision number. Problem is that Post.revisions is NULL but I think it should be automatically populated. I guess there's some kind of problem in my source code but I don't know where. Here's my "persistence" code: Post post = new Post(); PostRevision revision = new PostRevision(); revision.post = post; em.persist(post); em.persist(revision); em.flush(); I think that after persisting "post", it becomes "managed" and all the relations should be populated from now on. Thanks for help! (Note: public attributes are just for demonstration)

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• is it good "form" to declare new classes in the same file ?

  - by hatorade

  I code in Python a lot, and I frequently create classes. Now, I'm not sure if this is good Python form, but I just declare a class in the same file as my main(). class foo { ... } I'm wondering if it's good form in Java to do the same? For example, class foo { public static int name; public static int numPoints; public static int[] points; } public class bar { public static void main(String[] args) { ... } } Does not throw errors in Eclipse, so it must be allowed. But is it okay to do? Would it be better to just declare this class in a separate file..? Edit: I just want to emphasize that my new class literally is just a container to hold the same type of data multiple times, and literally will only have like 3 values. So it's total about 5 lines of code. The question is - does this merit a new file?

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• Should I use an interface or factory (and interface) for a cross-platform implementation?

  - by nbolton

  Example A: // pseudo code interface IFoo { void bar(); } class FooPlatformA : IFoo { void bar() { /* ... */ } } class FooPlatformB : IFoo { void bar() { /* ... */ } } class Foo : IFoo { IFoo m_foo; public Foo() { if (detectPlatformA()} { m_foo = new FooPlatformA(); } else { m_foo = new FooPlatformB(); } } // wrapper function - downside is we'd have to create one // of these for each function, which doesn't seem right. void bar() { m_foo.bar(); } } Main() { Foo foo = new Foo(); foo.bar(); } Example B: // pseudo code interface IFoo { void bar(); } class FooPlatformA : IFoo { void bar() { /* ... */ } } class FooPlatformB : IFoo { void bar() { /* ... */ } } class FooFactory { IFoo newFoo() { if (detectPlatformA()} { return new FooPlatformA(); } else { return new FooPlatformB(); } } } Main() { FooFactory factory = new FooFactory(); IFoo foo = factory.newFoo(); foo.bar(); } Which is the better option, example A, B, neither, or "it depends"?

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• Is it possible to submit data into a SQL database, wait for that to finish, and then return the ID g

  - by user322478

  I have an ASP form that needs to submit data to two different systems. First the data needs to go into an MS SQL database, which will get an ID. I then need to submit all that form data to an external system, along with that ID. Pretty much everything in the code works just fine, the data goes into the database, and the data will go to the external system. The problem is I am not getting my ID back from SQL when I execute that query. I am under the impression this is happening because of how fast everything occurs in the code. The database is adding it's row at the same time my post page runs it's query to get the ID back, I think. I need to know of a way to wait until SQL finished the insert or wait for a specific amount of time maybe. I already tried using the hacks to "sleep" with ASP, that did not help. I am sure I could accomplish this in .Net, my background is more .Net than ASP, but this is what I have to work with on my current project. Any ideas?

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• iphone app working on most devices but not a few

  - by Matt Facer

  Hi there. I have recently been rewriting some of my iphone app because a couple of users have said it was crashing on certain events. The event in question is when I add a new XIB to the view using the following code AddItemViewController * add_item = [[AddItemViewController alloc] initWithNibName:@"AddItem" bundle:[NSBundle mainBundle]]; [self presentModalViewController:add_item animated:YES]; [add_item setViewFormat:2]; [add_item release]; it works perfectly on my iphone and a mate's ipod touch (both running 3.1.3) but another user on an ipod touch also with 3.1.3 says it crashes when the function above is called. Why could this be happening? Surely if it works on one device it should work on another?! Is there a better way to add a view which maybe doesnt crash? I have also disabled all the code on the loading xib - so it literally is loading a near blank page. It's SO annoying!! Thanks for any help.

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• select k th mimimum from array a[0..n-1]

  - by davit-datuashvili

  i have done folloing code from progrmming pearls here is code import java.util.*; public class select { public static int select1(int x[],int l,int u,int k){ //pre l<=k<=u //post x[l..k-1]<=x[k]<=x[k+1..u] Random r=new Random(); int t=r.nextInt(u-1-l)+l; if (l>=u) return -1 ; swap(l,t); int s=x[l]; int i=l; int j=u+1; while (true){ do { i++; }while (i<=u && x[i]<t); do { j--; }while (x[j]>t); if (i>j) break; int temp=x[i]; x[i]=x[j];x[j]=t; swap(l,j); if (j<k){ return select1(x,j+1,u,k); } } return select1(x,l,j-1,k); } public static void main(String[] args) { int x[]=new int[]{4,7,9,3,2,12,13,10,20}; select1(x,0,x.length-1,5); } public static void swap(int i,int j){ int c=i; i=j; j=c; } } but here is mistake Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1 at select.select1(select.java:21) at select.main(select.java:36) Java Result: 1 please help

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• How to open a chat window in sender and receiver side [on hold]

  - by DEEPS

  When i am trying to send a message from sender the chat window is always opening in senders side instead of receiver side.so please give a correct code to display chat box in both side. (HTML 5, JAVASCRIPT,JQUERY). This is client side code: //Send private message function sendPvtMsg(data) { var pvtmsg = data; socket.emit('message',JSON.stringify({msg: 'pvtMsg', data: { from: userName, to: toChat, pvtmsg: data }}),roomId); } socket.on('message',function(data) { var command = JSON.parse(data); var itemName = command.msg; var rec_data = command.data.message; var sender = command.data.name; //Receive message from server if (itemName == "message") { document.getElementById("chat").value += sender + " : " + rec_data + "\n"; } //Receive private message else if (itemName == "pvtMsg") { var to = command.data.to; var from = command.data.from; //To display message to sender and receiver if (userName == to || userName == from) { var pvtmsg = command.data.pvtmsg; document.getElementById("chat").value += from + "( to " + to + ")" + " : " + pvtmsg + "\n"; } } function createChatBox(chatboxtitle,minimizeChatBox) { if ($("#chatbox_"+chatboxtitle).length > 0) { if ($("#chatbox_"+chatboxtitle).css('display') == 'none') { $("#chatbox_"+chatboxtitle).css('display','block'); restructureChatBoxes(); } $("#chatbox_"+chatboxtitle+" .chatboxtextarea").focus(); return; }

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• getting duplicate array output - java

  - by dowln

  Hello, Can someone could be kind and help me out here. Thanks in advance... My code below outputs the string as duplicates. I don't want to use Sets or ArrayList. I am using java.util.Random. I am trying to write a code that checks if string has already been randomly outputted and if it does, then it won't display. Where I am going wrong and how do I fix this. public class Worldcountries { private static Random nums = new Random(); private static String[] countries = { "America", "Candada", "Chile", "Argentina" }; public static int Dice() { return (generator.nums.nextInt(6) + 1); } public String randomCounties() { String aTemp = " "; int numOfTimes = Dice(); int dup = 0; for(int i=0 ; i<numOfTimes; i++) { // I think it's in the if statement where I am going wrong. if (!countries[i].equals(countries[i])) { i = i + 1; } else { dup--; } // and maybe here aTemp = aTemp + countries[nums.nextInt(countries.length)]; aTemp = aTemp + ","; } return aTemp; } } So the output I am getting (randomly) is, "America, America, Chile" when it should be "America, Chile".

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• Rails form not creating object

  - by user2136807

  I have created a simple form to create an instance of a modle and for some reason it is not calling the create method in the controller. Here is the form code: <% @house.mates.each do |mate| %> <p><%= mate.name %></p> <% end %> <h2>Add a new mate:</h2> <%= form_for @mate do |f| %> <p><%= f.label "Name" %> <%= f.text_field :name %> <%= f.hidden_field :house_id %> </p> <%= f.submit "Submit", :action => :create %> <% end %> Here is the controller code: class MatesController < ApplicationController def new @mate = Mate.new end def create @mate = Mate.new(params[:mate]) @mate.save redirect_to house_path(current_house) end end There is a many to one relationship between the Mate model and the House model... I am fairly new to rails but I have made other apps with similar forms, and I have never had this problem before. I can create and save Mate objects in the console, and I am not getting any errors, so it seem that somehow the controller method is not being called. Any help is much appreciated!

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• Problem in thread pool implementation(C#3.0)

  - by Newbie

  Hi Experts, I have done the below thread pool program but the problem is that the WaitCallBackMethod(here ThreadPoolCallback) is getting called 2 times(which ideally should be called 1ce). what is the misktake I am making? public class Calculation { #region Private variable declaration ManualResetEvent[] factorManualResetEvent = null; #endregion public void Compute() { factorManualResetEvent = new ManualResetEvent[2]; for (int i = 0; i < 2; i++){ factorManualResetEvent[i] = new ManualResetEvent(false); ThreadPool.QueueUserWorkItem(ThreadPoolCallback, i);} //Wait for all the threads to complete WaitHandle.WaitAll(factorManualResetEvent); //Proceed with the next task(s) NEXT_TASK_TO_BE_EXECUTED(); } #region Private Methods // Wrapper method for use with thread pool. public void ThreadPoolCallback(Object threadContext) { int threadIndex = (int)threadContext; Method1(); Method2(); factorManualResetEvent[threadIndex].Set(); } private void Method1 () { //Code of method 1} private void Method2 () { //Code of method 2 } #endregion } I am using C#3.0 Thanks

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• Aborting $.post() / responsive search results

  - by Emphram Stavanger

  I have the following kludgey code; HTML <input type="search" id="search_box" /> <div id="search_results"></div> JS var search_timeout, search_xhr; $("#search_box").bind("textchange", function(){ clearTimeout(search_timeout); search_xhr.abort(); search_term = $(this).val(); search_results = $("#search_results"); if(search_term == "") { if(search_results.is(":visible")) search_results.stop().hide("blind", 200); } else { if(search_results.is(":hidden")) search_results.stop().show("blind", 200); } search_timeout = setTimeout(function () { search_xhr = $.post("search.php", { q: search_term }, function(data){ search_results.html(data); }); }, 100); }); (uses the textchange plugin by Zurb) The problem I had with my original more simple code was that it was horribly unresponsive. Results would appear seconds later, especially when typed slower, or when Backspace was used, etc. I made all this, and the situation isn't much better. Requests pile up. My original intention is to use .abort() to cancel out whatever previous request is still running as the textchange event is fired again (as per 446594). This doesn't work, as I get repeated errors like this in console; Uncaught TypeError: Cannot call method 'abort' of undefined How can I make .abort() work in my case? Furthermore, is this approach the best way to fetch 'realtime' search results? Much like Facebook's search bar, which gives results as the user types, and seems to be very quick on its feet.

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• Parallel features in .Net 4.0

  - by Jonathan.Peppers

  I have been going over the practicality of some of the new parallel features in .Net 4.0. Say I have code like so: foreach (var item in myEnumerable) myDatabase.Insert(item.ConvertToDatabase()); Imagine myDatabase.Insert is performing some work to insert to a SQL database. Theoretically you could write: Parallel.ForEach(myEnumerable, item => myDatabase.Insert(item.ConvertToDatabase())); And automatically you get code that takes advantage of multiple cores. But what if myEnumerable can only be interacted with by a single thread? Will the Parallel class enumerate by a single thread and only dispatch the result to worker threads in the loop? What if myDatabase can only be interacted with by a single thread? It would certainly not be better to make a database connection per iteration of the loop. Finally, what if my "var item" happens to be a UserControl or something that must be interacted with on the UI thread? What design pattern should I follow to solve these problems? It's looking to me that switching over to Parallel/PLinq/etc is not exactly easy when you are dealing with real-world applications.

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• C++: Shortest and best way to "reinitialize"/clean a class instance

  - by Oper

  I will keep it short and just show you a code example: class myClass { public: myClass(); int a; int b; int c; } // In the myClass.cpp or whatever myClass::myClass( ) { a = 0; b = 0; c = 0; } Okay. If I know have an instance of myClass and set some random garbage to a, b and c. What is the best way to reset them all to the state after the class constructor was called, so: 0, 0 and 0? I came up with this way: myClass emptyInstance; myUsedInstance = emptyInstance; // Ewww.. code smell? Or.. myUsedInstance.a = 0; myUsedInstance.c = 0; myUsedInstance.c = 0; I think you know what I want, is there any better way to achieve this?

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• Question about <foreach> task and the failonerror attribute?

  - by Mike M

  Hi guys, I have made a build file for the automated compilation of Oracle Forms files. An excerpt of the code is as follows: <target name="build" description="compiles the source code"> ... <foreach item="File" property="filename" failonerror="false" > <in> <items basedir="${source.directory}\${project.type}\Forms"> <include name="*.fmb" /> </items> </in> <do> <exec program="${forms.path}" workingdir="${source.directory}\${project.type}\Forms" commandline="module=${filename} userid=${username}/${password}@${database} batch=yes module_type=form compile_all=yes window_state=minimize" /> </do> </foreach> ... </target> The build file navigates to the directory containing the forms that the user desires fo compile and attempts to compile each form. The failonerror attribute is set to false so that the build file does not exit if a compilation error occurs. Unfortunately, however, though this prevents the build file from exiting when a compilation error occurs, it also appears to make the build file exit the task. This is a problem because, unless the form that does not compile successfully is the last to be tested (based on the filename of the form in alphanumerical decsending order), there will be one or more forms that the build file does not attempt to compile. So, for example, if the folder containing the forms that are desired to be compiled contains 10 forms and the first form does not compile successfully, the build file will not attempt to compile the remaining 9 forms (ie exit the task). Is there a way to make the build file attempt to compile remaining forms after encountering after failing to compile a form? Thanks in advance!

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• Failing to use Array.Copy() in my WPF App

  - by Steven Wilson

  I am a C++ developer and recently started working on WPF. Well I am using Array.Copy() in my app and looks like I am not able to completely get the desired result. I had done in my C++ app as follows: static const signed char version[40] = { 'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E', // name 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // reserved, firmware size 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // board number 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , // variant, version, serial 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 // date code, reserved }; unsigned char sendBuf[256] = {}; int memloc = 0; sendBuf[memloc++] = 0; sendBuf[memloc++] = 0; // fill in the audience header memcpy(sendBuf+memloc, version, 8); // the first 8 bytes memloc += 16; // the 8 copied, plus 8 reserved bytes I did the similar operation in my WPF (C#) app as follows: Byte[] sendBuf = new Byte[256]; char[] version = { 'A', 'U', 'D', 'I', 'E', 'N', 'C', 'E', // name '0', '0', '0', '0', '0', '0', '0', '0' , // reserved, firmware size '0', '0', '0', '0', '0', '0', '0', '0' , // board number '0', '0', '0', '0', '0', '0', '0', '0' , // variant, version, serial '0', '0', '0', '0', '0', '0', '0', '0' // date code, reserved }; // fill in the address to write to -- 0 sendBuf[memloc++] = 0; sendBuf[memloc++] = 0; // fill in the audience header Array.Copy(sendBuf + memloc, version, 8); // the first 8 bytes memloc += 16; But it throws me an error at Array.Copy(sendBuf + memloc, version, 8); as Operator '+' cannot be applied to operands of type 'byte[]' and 'int'. How can achieve this???? :) please help :)

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• April 14th Links: ASP.NET, ASP.NET MVC, ASP.NET Web API and Visual Studio

  - by ScottGu

  Here is the latest in my link-listing blog series: ASP.NET Easily overlooked features in VS 11 Express for Web: Good post by Scott Hanselman that highlights a bunch of easily overlooked improvements that are coming to VS 11 (and specifically the free express editions) for web development: unit testing, browser chooser/launcher, IIS Express, CSS Color Picker, Image Preview in Solution Explorer and more. Get Started with ASP.NET 4.5 Web Forms: Good 5-part tutorial that walks-through building an application using ASP.NET Web Forms and highlights some of the nice improvements coming with ASP.NET 4.5. What is New in Razor V2 and What Else is New in Razor V2: Great posts by Andrew Nurse, a dev on the ASP.NET team, about some of the new improvements coming with ASP.NET Razor v2. ASP.NET MVC 4 AllowAnonymous Attribute: Nice post from David Hayden that talks about the new [AllowAnonymous] filter introduced with ASP.NET MVC 4. Introduction to the ASP.NET Web API: Great tutorial by Stephen Walher that covers how to use the new ASP.NET Web API support built-into ASP.NET 4.5 and ASP.NET MVC 4. Comprehensive List of ASP.NET Web API Tutorials and Articles: Tugberk Ugurlu links to a huge collection of articles, tutorials, and samples about the new ASP.NET Web API capability. Async Mashups using ASP.NET Web API: Nice post by Henrik on how you can use the new async language support coming with .NET 4.5 to easily and efficiently make asynchronous network requests that do not block threads within ASP.NET. ASP.NET and Front-End Web Development Visual Studio 11 and Front End Web Development - JavaScript/HTML5/CSS3: Nice post by Scott Hanselman that highlights some of the great improvements coming with VS 11 (including the free express edition) for front-end web development. HTML5 Drag/Drop and Async Multi-file Upload with ASP.NET Web API: Great post by Filip W. that demonstrates how to implement an async file drag/drop uploader using HTML5 and ASP.NET Web API. Device Emulator Guide for Mobile Development with ASP.NET: Good post from Rachel Appel that covers how to use various device emulators with ASP.NET and VS to develop cross platform mobile sites. Fixing these jQuery: A Guide to Debugging: Great presentation by Adam Sontag on debugging with JavaScript and jQuery.  Some really good tips, tricks and gotchas that can save a lot of time. ASP.NET and Open Source Getting Started with ASP.NET Web Stack Source on CodePlex: Fantastic post by Henrik (an architect on the ASP.NET team) that provides step by step instructions on how to work with the ASP.NET source code we recently open sourced. Contributing to ASP.NET Web Stack Source on CodePlex: Follow-on to the post above (also by Henrik) that walks-through how you can submit a code contribution to the ASP.NET MVC, Web API and Razor projects. Overview of the WebApiContrib project: Nice post by Pedro Reys on the new open source WebApiContrib project that has been started to deliver cool extensions and libraries for use with ASP.NET Web API. Entity Framework Entity Framework 5 Performance Improvements and Performance Considerations for EF5:  Good articles that describes some of the big performance wins coming with EF5 (which will ship with both .NET 4.5 and ASP.NET MVC 4). Automatic compilation of LINQ queries will yield some significant performance wins (up to 600% faster). ASP.NET MVC 4 and EF Database Migrations: Good post by David Hayden that covers the new database migrations support within EF 4.3 which allows you to easily update your database schema during development - without losing any of the data within it. Visual Studio What's New in Visual Studio 11 Unit Testing: Nice post by Peter Provost (from the VS team) that talks about some of the great improvements coming to VS11 for unit testing - including built-in VS tooling support for a broad set of unit test frameworks (including NUnit, XUnit, Jasmine, QUnit and more) Hope this helps, Scott

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• Creating a Build Definition using the TFS 2010 API

  - by Jakob Ehn

  In this post I will show how to create a new build definition in TFS 2010 using the TFS API. When creating a build definition manually, using Team Explorer, the necessary steps are lined out in the New Build Definition Wizard:     So, lets see how the code looks like, using the same order. To start off, we need to connect to TFS and get a reference to the IBuildServer object: TfsTeamProjectCollection server = newTfsTeamProjectCollection(newUri("http://<tfs>:<port>/tfs")); server.EnsureAuthenticated(); IBuildServer buildServer = (IBuildServer) server.GetService(typeof (IBuildServer)); General First we create a IBuildDefinition object for the team project and set a name and description for it: var buildDefinition = buildServer.CreateBuildDefinition(teamProject); buildDefinition.Name = "TestBuild"; buildDefinition.Description = "description here..."; Trigger Next up, we set the trigger type. For this one, we set it to individual which corresponds to the Continuous Integration - Build each check-in trigger option buildDefinition.ContinuousIntegrationType = ContinuousIntegrationType.Individual; Workspace For the workspace mappings, we create two mappings here, where one is a cloak. Note the user of $(SourceDir) variable, which is expanded by Team Build into the sources directory when running the build. buildDefinition.Workspace.AddMapping("$/Path/project.sln", "$(SourceDir)", WorkspaceMappingType.Map); buildDefinition.Workspace.AddMapping("$/OtherPath/", "", WorkspaceMappingType.Cloak); Build Defaults In the build defaults, we set the build controller and the drop location. To get a build controller, we can (for example) use the GetBuildController method to get an existing build controller by name: buildDefinition.BuildController = buildServer.GetBuildController(buildController); buildDefinition.DefaultDropLocation = @\\SERVER\Drop\TestBuild; Process So far, this wasy easy. Now we get to the tricky part. TFS 2010 Build is based on Windows Workflow 4.0. The build process is defined in a separate .XAML file called a Build Process Template. By default, every new team team project containtwo build process templates called DefaultTemplate and UpgradeTemplate. In this sample, we want to create a build definition using the default template. We use te QueryProcessTemplates method to get a reference to the default for the current team project   //Get default template var defaultTemplate = buildServer.QueryProcessTemplates(teamProject).Where(p => p.TemplateType == ProcessTemplateType.Default).First(); buildDefinition.Process = defaultTemplate;   There are several build process templates that can be set for the default build process template. Only one of these are required, the ProjectsToBuild parameters which contains the solution(s) and configuration(s) that should be built. To set this info, we use the ProcessParameters property of thhe IBuildDefinition interface. The format of this property is actually just a serialized dictionary (IDictionary<string, object>) that maps a key (parameter name) to a value which can be any kind of object. This is rather messy, but fortunately, there is a helper class called WorkflowHelpers inthe Microsoft.TeamFoundation.Build.Workflow namespace, that simplifies working with this persistence format a bit. The following code shows how to set the BuildSettings information for a build definition: //Set process parameters varprocess = WorkflowHelpers.DeserializeProcessParameters(buildDefinition.ProcessParameters); //Set BuildSettings properties BuildSettings settings = newBuildSettings(); settings.ProjectsToBuild = newStringList("$/pathToProject/project.sln"); settings.PlatformConfigurations = newPlatformConfigurationList(); settings.PlatformConfigurations.Add(newPlatformConfiguration("Any CPU", "Debug")); process.Add("BuildSettings", settings); buildDefinition.ProcessParameters = WorkflowHelpers.SerializeProcessParameters(process); The other build process parameters of a build definition can be set using the same approach   Retention  Policy This one is easy, we just clear the default settings and set our own: buildDefinition.RetentionPolicyList.Clear(); buildDefinition.AddRetentionPolicy(BuildReason.Triggered, BuildStatus.Succeeded, 10, DeleteOptions.All); buildDefinition.AddRetentionPolicy(BuildReason.Triggered, BuildStatus.Failed, 10, DeleteOptions.All); buildDefinition.AddRetentionPolicy(BuildReason.Triggered, BuildStatus.Stopped, 1, DeleteOptions.All); buildDefinition.AddRetentionPolicy(BuildReason.Triggered, BuildStatus.PartiallySucceeded, 10, DeleteOptions.All); Save It! And we’re done, lets save the build definition: buildDefinition.Save(); That’s it!

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• Using an alternate JSON Serializer in ASP.NET Web API

  - by Rick Strahl

  The new ASP.NET Web API that Microsoft released alongside MVC 4.0 Beta last week is a great framework for building REST and AJAX APIs. I've been working with it for quite a while now and I really like the way it works and the complete set of features it provides 'in the box'. It's about time that Microsoft gets a decent API for building generic HTTP endpoints into the framework. DataContractJsonSerializer sucks As nice as Web API's overall design is one thing still sucks: The built-in JSON Serialization uses the DataContractJsonSerializer which is just too limiting for many scenarios. The biggest issues I have with it are: No support for untyped values (object, dynamic, Anonymous Types) MS AJAX style Date Formatting Ugly serialization formats for types like Dictionaries To me the most serious issue is dealing with serialization of untyped objects. I have number of applications with AJAX front ends that dynamically reformat data from business objects to fit a specific message format that certain UI components require. The most common scenario I have there are IEnumerable query results from a database with fields from the result set rearranged to fit the sometimes unconventional formats required for the UI components (like jqGrid for example). Creating custom types to fit these messages seems like overkill and projections using Linq makes this much easier to code up. Alas DataContractJsonSerializer doesn't support it. Neither does DataContractSerializer for XML output for that matter. What this means is that you can't do stuff like this in Web API out of the box:public object GetAnonymousType() { return new { name = "Rick", company = "West Wind", entered= DateTime.Now }; } Basically anything that doesn't have an explicit type DataContractJsonSerializer will not let you return. FWIW, the same is true for XmlSerializer which also doesn't work with non-typed values for serialization. The example above is obviously contrived with a hardcoded object graph, but it's not uncommon to get dynamic values returned from queries that have anonymous types for their result projections. Apparently there's a good possibility that Microsoft will ship Json.NET as part of Web API RTM release.  Scott Hanselman confirmed this as a footnote in his JSON Dates post a few days ago. I've heard several other people from Microsoft confirm that Json.NET will be included and be the default JSON serializer, but no details yet in what capacity it will show up. Let's hope it ends up as the default in the box. Meanwhile this post will show you how you can use it today with the beta and get JSON that matches what you should see in the RTM version. What about JsonValue? To be fair Web API DOES include a new JsonValue/JsonObject/JsonArray type that allow you to address some of these scenarios. JsonValue is a new type in the System.Json assembly that can be used to build up an object graph based on a dictionary. It's actually a really cool implementation of a dynamic type that allows you to create an object graph and spit it out to JSON without having to create .NET type first. JsonValue can also receive a JSON string and parse it without having to actually load it into a .NET type (which is something that's been missing in the core framework). This is really useful if you get a JSON result from an arbitrary service and you don't want to explicitly create a mapping type for the data returned. For serialization you can create an object structure on the fly and pass it back as part of an Web API action method like this:public JsonValue GetJsonValue() { dynamic json = new JsonObject(); json.name = "Rick"; json.company = "West Wind"; json.entered = DateTime.Now; dynamic address = new JsonObject(); address.street = "32 Kaiea"; address.zip = "96779"; json.address = address; dynamic phones = new JsonArray(); json.phoneNumbers = phones; dynamic phone = new JsonObject(); phone.type = "Home"; phone.number = "808 123-1233"; phones.Add(phone); phone = new JsonObject(); phone.type = "Home"; phone.number = "808 123-1233"; phones.Add(phone); //var jsonString = json.ToString(); return json; } which produces the following output (formatted here for easier reading):{ name: "rick", company: "West Wind", entered: "2012-03-08T15:33:19.673-10:00", address: { street: "32 Kaiea", zip: "96779" }, phoneNumbers: [ { type: "Home", number: "808 123-1233" }, { type: "Mobile", number: "808 123-1234" }] } If you need to build a simple JSON type on the fly these types work great. But if you have an existing type - or worse a query result/list that's already formatted JsonValue et al. become a pain to work with. As far as I can see there's no way to just throw an object instance at JsonValue and have it convert into JsonValue dictionary. It's a manual process. Using alternate Serializers in Web API So, currently the default serializer in WebAPI is DataContractJsonSeriaizer and I don't like it. You may not either, but luckily you can swap the serializer fairly easily. If you'd rather use the JavaScriptSerializer built into System.Web.Extensions or Json.NET today, it's not too difficult to create a custom MediaTypeFormatter that uses these serializers and can replace or partially replace the native serializer. Here's a MediaTypeFormatter implementation using the ASP.NET JavaScriptSerializer:using System; using System.Net.Http.Formatting; using System.Threading.Tasks; using System.Web.Script.Serialization; using System.Json; using System.IO; namespace Westwind.Web.WebApi { public class JavaScriptSerializerFormatter : MediaTypeFormatter { public JavaScriptSerializerFormatter() { SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("application/json")); } protected override bool CanWriteType(Type type) { // don't serialize JsonValue structure use default for that if (type == typeof(JsonValue) || type == typeof(JsonObject) || type== typeof(JsonArray) ) return false; return true; } protected override bool CanReadType(Type type) { if (type == typeof(IKeyValueModel)) return false; return true; } protected override System.Threading.Tasks.Taskobject OnReadFromStreamAsync(Type type, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext) { var task = Taskobject.Factory.StartNew(() = { var ser = new JavaScriptSerializer(); string json; using (var sr = new StreamReader(stream)) { json = sr.ReadToEnd(); sr.Close(); } object val = ser.Deserialize(json,type); return val; }); return task; } protected override System.Threading.Tasks.Task OnWriteToStreamAsync(Type type, object value, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext, System.Net.TransportContext transportContext) { var task = Task.Factory.StartNew( () = { var ser = new JavaScriptSerializer(); var json = ser.Serialize(value); byte[] buf = System.Text.Encoding.Default.GetBytes(json); stream.Write(buf,0,buf.Length); stream.Flush(); }); return task; } } } Formatter implementation is pretty simple: You override 4 methods to tell which types you can handle and then handle the input or output streams to create/parse the JSON data. Note that when creating output you want to take care to still allow JsonValue/JsonObject/JsonArray types to be handled by the default serializer so those objects serialize properly - if you let either JavaScriptSerializer or JSON.NET handle them they'd try to render the dictionaries which is very undesirable. If you'd rather use Json.NET here's the JSON.NET version of the formatter:// this code requires a reference to JSON.NET in your project #if true using System; using System.Net.Http.Formatting; using System.Threading.Tasks; using System.Web.Script.Serialization; using System.Json; using Newtonsoft.Json; using System.IO; using Newtonsoft.Json.Converters; namespace Westwind.Web.WebApi { public class JsonNetFormatter : MediaTypeFormatter { public JsonNetFormatter() { SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("application/json")); } protected override bool CanWriteType(Type type) { // don't serialize JsonValue structure use default for that if (type == typeof(JsonValue) || type == typeof(JsonObject) || type == typeof(JsonArray)) return false; return true; } protected override bool CanReadType(Type type) { if (type == typeof(IKeyValueModel)) return false; return true; } protected override System.Threading.Tasks.Taskobject OnReadFromStreamAsync(Type type, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext) { var task = Taskobject.Factory.StartNew(() = { var settings = new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore, }; var sr = new StreamReader(stream); var jreader = new JsonTextReader(sr); var ser = new JsonSerializer(); ser.Converters.Add(new IsoDateTimeConverter()); object val = ser.Deserialize(jreader, type); return val; }); return task; } protected override System.Threading.Tasks.Task OnWriteToStreamAsync(Type type, object value, System.IO.Stream stream, System.Net.Http.Headers.HttpContentHeaders contentHeaders, FormatterContext formatterContext, System.Net.TransportContext transportContext) { var task = Task.Factory.StartNew( () = { var settings = new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore, }; string json = JsonConvert.SerializeObject(value, Formatting.Indented, new JsonConverter[1] { new IsoDateTimeConverter() } ); byte[] buf = System.Text.Encoding.Default.GetBytes(json); stream.Write(buf,0,buf.Length); stream.Flush(); }); return task; } } } #endif   One advantage of the Json.NET serializer is that you can specify a few options on how things are formatted and handled. You get null value handling and you can plug in the IsoDateTimeConverter which is nice to product proper ISO dates that I would expect any Json serializer to output these days. Hooking up the Formatters Once you've created the custom formatters you need to enable them for your Web API application. To do this use the GlobalConfiguration.Configuration object and add the formatter to the Formatters collection. Here's what this looks like hooked up from Application_Start in a Web project:protected void Application_Start(object sender, EventArgs e) { // Action based routing (used for RPC calls) RouteTable.Routes.MapHttpRoute( name: "StockApi", routeTemplate: "stocks/{action}/{symbol}", defaults: new { symbol = RouteParameter.Optional, controller = "StockApi" } ); // WebApi Configuration to hook up formatters and message handlers // optional RegisterApis(GlobalConfiguration.Configuration); } public static void RegisterApis(HttpConfiguration config) { // Add JavaScriptSerializer formatter instead - add at top to make default //config.Formatters.Insert(0, new JavaScriptSerializerFormatter()); // Add Json.net formatter - add at the top so it fires first! // This leaves the old one in place so JsonValue/JsonObject/JsonArray still are handled config.Formatters.Insert(0, new JsonNetFormatter()); } One thing to remember here is the GlobalConfiguration object which is Web API's static configuration instance. I think this thing is seriously misnamed given that GlobalConfiguration could stand for anything and so is hard to discover if you don't know what you're looking for. How about WebApiConfiguration or something more descriptive? Anyway, once you know what it is you can use the Formatters collection to insert your custom formatter. Note that I insert my formatter at the top of the list so it takes precedence over the default formatter. I also am not removing the old formatter because I still want JsonValue/JsonObject/JsonArray to be handled by the default serialization mechanism. Since they process in sequence and I exclude processing for these types JsonValue et al. still get properly serialized/deserialized. Summary Currently DataContractJsonSerializer in Web API is a pain, but at least we have the ability with relatively limited effort to replace the MediaTypeFormatter and plug in our own JSON serializer. This is useful for many scenarios - if you have existing client applications that used MVC JsonResult or ASP.NET AJAX results from ASMX AJAX services you can plug in the JavaScript serializer and get exactly the same serializer you used in the past so your results will be the same and don't potentially break clients. JSON serializers do vary a bit in how they serialize some of the more complex types (like Dictionaries and dates for example) and so if you're migrating it might be helpful to ensure your client code doesn't break when you switch to ASP.NET Web API. Going forward it looks like Microsoft is planning on plugging in Json.Net into Web API and make that the default. I think that's an awesome choice since Json.net has been around forever, is fast and easy to use and provides a ton of functionality as part of this great library. I just wish Microsoft would have figured this out sooner instead of now at the last minute integrating with it especially given that Json.Net has a similar set of lower level JSON objects JsonValue/JsonObject etc. which now will end up being duplicated by the native System.Json stuff. It's not like we don't already have enough confusion regarding which JSON serializer to use (JavaScriptSerializer, DataContractJsonSerializer, JsonValue/JsonObject/JsonArray and now Json.net). For years I've been using my own JSON serializer because the built in choices are both limited. However, with an official encorsement of Json.Net I'm happily moving on to use that in my applications. Let's see and hope Microsoft gets this right before ASP.NET Web API goes gold.© Rick Strahl, West Wind Technologies, 2005-2012Posted in Web Api  AJAX  ASP.NET   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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• Using jQuery to Insert a New Database Record

  - by Stephen Walther

  The goal of this blog entry is to explore the easiest way of inserting a new record into a database using jQuery and .NET. I’m going to explore two approaches: using Generic Handlers and using a WCF service (In a future blog entry I’ll take a look at OData and WCF Data Services). Create the ASP.NET Project I’ll start by creating a new empty ASP.NET application with Visual Studio 2010. Select the menu option File, New Project and select the ASP.NET Empty Web Application project template. Setup the Database and Data Model I’ll use my standard MoviesDB.mdf movies database. This database contains one table named Movies that looks like this: I’ll use the ADO.NET Entity Framework to represent my database data: Select the menu option Project, Add New Item and select the ADO.NET Entity Data Model project item. Name the data model MoviesDB.edmx and click the Add button. In the Choose Model Contents step, select Generate from database and click the Next button. In the Choose Your Data Connection step, leave all of the defaults and click the Next button. In the Choose Your Data Objects step, select the Movies table and click the Finish button. Unfortunately, Visual Studio 2010 cannot spell movie correctly :) You need to click on Movy and change the name of the class to Movie. In the Properties window, change the Entity Set Name to Movies. Using a Generic Handler In this section, we’ll use jQuery with an ASP.NET generic handler to insert a new record into the database. A generic handler is similar to an ASP.NET page, but it does not have any of the overhead. It consists of one method named ProcessRequest(). Select the menu option Project, Add New Item and select the Generic Handler project item. Name your new generic handler InsertMovie.ashx and click the Add button. Modify your handler so it looks like Listing 1: Listing 1 – InsertMovie.ashx using System.Web; namespace WebApplication1 { /// <summary> /// Inserts a new movie into the database /// </summary> public class InsertMovie : IHttpHandler { private MoviesDBEntities _dataContext = new MoviesDBEntities(); public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; // Extract form fields var title = context.Request["title"]; var director = context.Request["director"]; // Create movie to insert var movieToInsert = new Movie { Title = title, Director = director }; // Save new movie to DB _dataContext.AddToMovies(movieToInsert); _dataContext.SaveChanges(); // Return success context.Response.Write("success"); } public bool IsReusable { get { return true; } } } } In Listing 1, the ProcessRequest() method is used to retrieve a title and director from form parameters. Next, a new Movie is created with the form values. Finally, the new movie is saved to the database and the string “success” is returned. Using jQuery with the Generic Handler We can call the InsertMovie.ashx generic handler from jQuery by using the standard jQuery post() method. The following HTML page illustrates how you can retrieve form field values and post the values to the generic handler: Listing 2 – Default.htm <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Add Movie</title> <script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.js" type="text/javascript"></script> </head> <body> <form> <label>Title:</label> <input name="title" /> <br /> <label>Director:</label> <input name="director" /> </form> <button id="btnAdd">Add Movie</button> <script type="text/javascript"> $("#btnAdd").click(function () { $.post("InsertMovie.ashx", $("form").serialize(), insertCallback); }); function insertCallback(result) { if (result == "success") { alert("Movie added!"); } else { alert("Could not add movie!"); } } </script> </body> </html>     When you open the page in Listing 2 in a web browser, you get a simple HTML form: Notice that the page in Listing 2 includes the jQuery library. The jQuery library is included with the following SCRIPT tag: <script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.js" type="text/javascript"></script> The jQuery library is included on the Microsoft Ajax CDN so you can always easily include the jQuery library in your applications. You can learn more about the CDN at this website: http://www.asp.net/ajaxLibrary/cdn.ashx When you click the Add Movie button, the jQuery post() method is called to post the form data to the InsertMovie.ashx generic handler. Notice that the form values are serialized into a URL encoded string by calling the jQuery serialize() method. The serialize() method uses the name attribute of form fields and not the id attribute. Notes on this Approach This is a very low-level approach to interacting with .NET through jQuery – but it is simple and it works! And, you don’t need to use any JavaScript libraries in addition to the jQuery library to use this approach. The signature for the jQuery post() callback method looks like this: callback(data, textStatus, XmlHttpRequest) The second parameter, textStatus, returns the HTTP status code from the server. I tried returning different status codes from the generic handler with an eye towards implementing server validation by returning a status code such as 400 Bad Request when validation fails (see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html ). I finally figured out that the callback is not invoked when the textStatus has any value other than “success”. Using a WCF Service As an alternative to posting to a generic handler, you can create a WCF service. You create a new WCF service by selecting the menu option Project, Add New Item and selecting the Ajax-enabled WCF Service project item. Name your WCF service InsertMovie.svc and click the Add button. Modify the WCF service so that it looks like Listing 3: Listing 3 – InsertMovie.svc using System.ServiceModel; using System.ServiceModel.Activation; namespace WebApplication1 { [ServiceBehavior(IncludeExceptionDetailInFaults=true)] [ServiceContract(Namespace = "")] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class MovieService { private MoviesDBEntities _dataContext = new MoviesDBEntities(); [OperationContract] public bool Insert(string title, string director) { // Create movie to insert var movieToInsert = new Movie { Title = title, Director = director }; // Save new movie to DB _dataContext.AddToMovies(movieToInsert); _dataContext.SaveChanges(); // Return movie (with primary key) return true; } } }   The WCF service in Listing 3 uses the Entity Framework to insert a record into the Movies database table. The service always returns the value true. Notice that the service in Listing 3 includes the following attribute: [ServiceBehavior(IncludeExceptionDetailInFaults=true)] You need to include this attribute if you want to get detailed error information back to the client. When you are building an application, you should always include this attribute. When you are ready to release your application, you should remove this attribute for security reasons. Using jQuery with the WCF Service Calling a WCF service from jQuery requires a little more work than calling a generic handler from jQuery. Here are some good blog posts on some of the issues with using jQuery with WCF: http://encosia.com/2008/06/05/3-mistakes-to-avoid-when-using-jquery-with-aspnet-ajax/ http://encosia.com/2008/03/27/using-jquery-to-consume-aspnet-json-web-services/ http://weblogs.asp.net/scottgu/archive/2007/04/04/json-hijacking-and-how-asp-net-ajax-1-0-mitigates-these-attacks.aspx http://www.west-wind.com/Weblog/posts/896411.aspx http://www.west-wind.com/weblog/posts/324917.aspx http://professionalaspnet.com/archive/tags/WCF/default.aspx The primary requirement when calling WCF from jQuery is that the request use JSON: The request must include a content-type:application/json header. Any parameters included with the request must be JSON encoded. Unfortunately, jQuery does not include a method for serializing JSON (Although, oddly, jQuery does include a parseJSON() method for deserializing JSON). Therefore, we need to use an additional library to handle the JSON serialization. The page in Listing 4 illustrates how you can call a WCF service from jQuery. Listing 4 – Default2.aspx <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Add Movie</title> <script src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.js" type="text/javascript"></script> <script src="Scripts/json2.js" type="text/javascript"></script> </head> <body> <form> <label>Title:</label> <input id="title" /> <br /> <label>Director:</label> <input id="director" /> </form> <button id="btnAdd">Add Movie</button> <script type="text/javascript"> $("#btnAdd").click(function () { // Convert the form into an object var data = { title: $("#title").val(), director: $("#director").val() }; // JSONify the data data = JSON.stringify(data); // Post it $.ajax({ type: "POST", contentType: "application/json; charset=utf-8", url: "MovieService.svc/Insert", data: data, dataType: "json", success: insertCallback }); }); function insertCallback(result) { // unwrap result result = result["d"]; if (result === true) { alert("Movie added!"); } else { alert("Could not add movie!"); } } </script> </body> </html> There are several things to notice about Listing 4. First, notice that the page includes both the jQuery library and Douglas Crockford’s JSON2 library: <script src="Scripts/json2.js" type="text/javascript"></script> You need to include the JSON2 library to serialize the form values into JSON. You can download the JSON2 library from the following location: http://www.json.org/js.html When you click the button to submit the form, the form data is converted into a JavaScript object: // Convert the form into an object var data = { title: $("#title").val(), director: $("#director").val() }; Next, the data is serialized into JSON using the JSON2 library: // JSONify the data var data = JSON.stringify(data); Finally, the form data is posted to the WCF service by calling the jQuery ajax() method: // Post it $.ajax({   type: "POST",   contentType: "application/json; charset=utf-8",   url: "MovieService.svc/Insert",   data: data,   dataType: "json",   success: insertCallback }); You can’t use the standard jQuery post() method because you must set the content-type of the request to be application/json. Otherwise, the WCF service will reject the request for security reasons. For details, see the Scott Guthrie blog post: http://weblogs.asp.net/scottgu/archive/2007/04/04/json-hijacking-and-how-asp-net-ajax-1-0-mitigates-these-attacks.aspx The insertCallback() method is called when the WCF service returns a response. This method looks like this: function insertCallback(result) {   // unwrap result   result = result["d"];   if (result === true) {       alert("Movie added!");   } else {     alert("Could not add movie!");   } } When we called the jQuery ajax() method, we set the dataType to JSON. That causes the jQuery ajax() method to deserialize the response from the WCF service from JSON into a JavaScript object automatically. The following value is passed to the insertCallback method: {"d":true} For security reasons, a WCF service always returns a response with a “d” wrapper. The following line of code removes the “d” wrapper: // unwrap result result = result["d"]; To learn more about the “d” wrapper, I recommend that you read the following blog posts: http://encosia.com/2009/02/10/a-breaking-change-between-versions-of-aspnet-ajax/ http://encosia.com/2009/06/29/never-worry-about-asp-net-ajaxs-d-again/ Summary In this blog entry, I explored two methods of inserting a database record using jQuery and .NET. First, we created a generic handler and called the handler from jQuery. This is a very low-level approach. However, it is a simple approach that works. Next, we looked at how you can call a WCF service using jQuery. This approach required a little more work because you need to serialize objects into JSON. We used the JSON2 library to perform the serialization. In the next blog post, I want to explore how you can use jQuery with OData and WCF Data Services.

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• Feb 2nd Links: Visual Studio, ASP.NET, ASP.NET MVC, JQuery, Windows Phone

  - by ScottGu

  Here is the latest in my link-listing series.  Also check out my Best of 2010 Summary for links to 100+ other posts I’ve done in the last year. [I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu] Community News MVCConf Conference Next Wednesday: Attend the free, online ASP.NET MVC Conference being organized by the community next Wednesday.  Here is a list of some of the talks you can watch live. Visual Studio HTML5 and CSS3 in VS 2010 SP1: Good post from the Visual Studio web tools team that talks about the new support coming in VS 2010 SP1 for HTML5 and CSS3. Database Deployment with the VS 2010 Package/Publish Database Tool: Rachel Appel has a nice post that covers how to enable database deployment using the built-in VS 2010 web deployment support.  Also check out her ASP.NET web deployment post from last month. VsVim Update Released: Jared posts about the latest update of his VsVim extension for Visual Studio 2010.  This free extension enables VIM based key-bindings within VS. ASP.NET How to Add Mobile Pages to your ASP.NET Web Forms / MVC Apps: Great whitepaper by Steve Sanderson that covers how to mobile-enable your ASP.NET and ASP.NET MVC based applications. New Entity Framework Tutorials for ASP.NET Developers: The ASP.NET and EF teams have put together a bunch of nice tutorials on using the Entity Framework data library with ASP.NET Web Forms. Using ASP.NET Dynamic Data with EF Code First (via NuGet): Nice post from David Ebbo that talks about how to use the new EF Code First Library with ASP.NET Dynamic Data. Common Performance Issues with ASP.NET Web Sites: Good post with lots of performance tuning suggestions (mostly deployment settings) for ASP.NET apps. ASP.NET MVC Razor View Converter: Free, automated tool from Terlik that can convert existing .aspx view templates to Razor view templates. ASP.NET MVC 3 Internationalization: Nadeem has a great post that talks about a variety of techniques you can use to enable Globalization and Localization within your ASP.NET MVC 3 applications. ASP.NET MVC 3 Tutorials by David Hayden: Great set of tutorials and posts by David Hayden on some of the new ASP.NET MVC 3 features. EF Fixed Concurrency Mode and MVC: Chris Sells has a nice post that talks about how to handle concurrency with updates done with EF using ASP.NET MVC. ASP.NET and jQuery jQuery Performance Tips and Tricks: A free 30 minute video that covers some great tips and tricks to keep in mind when using jQuery. jQuery 1.5’s AJAX rewrite and ASP.NET services - All is well: Nice post by Dave Ward that talks about using the new jQuery 1.5 to call ASP.NET ASMX Services. Good news according to Dave is that all is well :-) jQuery UI Modal Dialogs for ASP.NET MVC: Nice post by Rob Regan that talks about a few approaches you can use to implement dialogs with jQuery UI and ASP.NET MVC.  Windows Phone 7 Free PDF eBook on Building Windows Phone 7 Applications with Silverlight: Free book that walksthrough how to use Silverlight and Visual Studio to build Windows Phone 7 applications. Hope this helps, Scott

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