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• I'm going to write 'Unit of Work', please help me find out all gimmicks

  - by o..o

  Hi everybody, I'm going to write my own DAL in C#. I decided to use 'Unit of Work' pattern (next mentioned as uow) with request as a scope and Identity map stored in HttpContext.Items. I have right now question about implementing of CRUD methods. How/where are they implemented? Are they implemented in every single business class (as in active records pattern) or are implemented somehow in uow class (if so, how)? I also suppose that I need to use as the scope not just the request, but also the db connection. But how? Should I open the connection a the start of the request and close it on uow disposing? Every advice is strongly appreciated, especially Your "real world" experiences. Thank you all :)

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• Bluescreen 0x0000003B during DownloadFileAsync?

  - by SeveQ

  Hello again, I've run into a problem with an application I'm developing in C#/.NET. A problem I can't trace down because it causes my system to crash with a BSOD. Here's the minidump: 060310-27066-01.dmp 03.06.2010 19:47:39 SYSTEM_SERVICE_EXCEPTION 0x0000003b 00000000c0000005 fffff8000306d4d0 fffff8800b107640 0000000000000000 ntoskrnl.exe ntoskrnl.exe+70600 NT Kernel & System Microsoft® Windows® Operating System Microsoft Corporation 6.1.7600.16539 (win7_gdr.100226-1909) x64 C:\Windows\Minidump\060310-27066-01.dmp 4 15 7600 It's not related specifically to DownloadFileAsync. Other methods of the System.Net assembly classes related to HTTP download also make my system crash. I really hope someone can help me with this. Just for info: other apps (browsers etc.) that download files work like a charm. If you need further information don't hesitate to ask! Thanks!

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• Setting the database connection when using a TransactionScope

  - by eych

  Does the database connection have to be set inside a TransactionScope? Or can I set it in the ctor and then have instance methods create up a TransactionScope? EDIT: e.g. Public Sub New() Dim conn = new SqlConnection(...connection string) Public Sub SomeClassMethod() using ts as new TransactionScope //conn has already been initialized //so, here you can set commands, ExecuteDataSet, etc. vs Public Sub New() //nothing here Public Sub SomeClassMethod() using ts as new TransactionScope conn = new SqlConnection(...connection string) set commands, ExecuteDataSet, etc. the question is do you need to create the connection to the database after you've created a TransactionScope or can it be done before?

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• Winforms Controlling Forms

  - by jack london

  How can i control all my forms from main () static void Main() { Form1 frm1 = new Form1(); Form1 frm2 = new Form1(); Form1 frm3 = new Form1(); frm1.Show(); while (frm1.Button.Clicked) { frm2.Show(); frm3.Show(); } } form.ShowDialog () helps much but the execution stack can overflow. Form.Show and Form.Hide methods runs when an application class has been set. In Application.Run (Form) way there's always a main form. and i dont want this one. Any other approach you use in this problem

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• How do you get Client IP Address in Grails controller?

  - by Andrew

  I had code like this in Ruby @clientipaddress = request.env["HTTP_CLIENT_IP"] if (@clientipaddress == nil) @clientipaddress = request.env["HTTP_X_FORWARDED_FOR"] end if (@clientipaddress == nil) @clientipaddress = request.env["REMOTE_ADDR"] end if (@clientipaddress != nil) comma = @clientipaddress.index(",") if (comma != nil && comma >= 0) @clientipaddress = @clientipaddress[0, comma] end end It took care of all the possible ways that the ip might show up. For instance, on my local development machine there is no proxy. But in QA and Production the proxies are there and sometimes they provide more than one address. I don't need to know the groovy syntax. Just which methods get me the equivalent of the three different ways I ask for the ip above.

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• How do I debug a DLL from VS2008?

  - by GregH

  I have a program written in VB.Net (Visual Studio 2008) that uses a DLL written in Visual C++ by another developer. I'd like to be able to step in to the C++ code as my code makes calls to methods in the DLL. Since the DLL is it's own solution, I don't think it can be included in my solution/project. I tried putting the DLLs pdb file in the debug/bin directory with the rest of my build and pdb files. However, when I get to the point in stepping through my code, and it gets to the dll call, it just steps right over the dll code. Do I have to manually load symbols? Not sure what I'm doing wrong. Thanks.

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• Unable to cast object of type 'System.Object[]' to type 'System.String[]'

  - by salvationishere

  I am developing a C# VS 2008 / SQL Server website application. I am a newbie to ASP.NET. I am getting the above error, however, on the last line of the following code. Can you give me advice on how to fix this? This compiles correctly, but I encounter this error after running it. DataTable dt; Hashtable ht; string[] SingleRow; ... SqlConnection conn2 = new SqlConnection(connString); SqlCommand cmd = conn2.CreateCommand(); cmd.CommandText = "dbo.AppendDataCT"; cmd.Connection = conn2; SingleRow = (string[])dt.Rows[1].ItemArray; My error: System.InvalidCastException was caught Message="Unable to cast object of type 'System.Object[]' to type 'System.String[]'." Source="App_Code.g68pyuml" StackTrace: at ADONET_namespace.ADONET_methods.AppendDataCT(DataTable dt, Hashtable ht) in c:\Documents and Settings\Admin\My Documents\Visual Studio 2008\WebSites\Jerry\App_Code\ADONET methods.cs:line 88 InnerException:

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• Objective C message dispatch mechanism

  - by Dolphin

  I am just staring to play around with Objective C (writing toy iPhone apps) and I am curious about the underlying mechanism used to dispatch messages. I have a good understanding of how virtual functions in C++ are generally implemented and what the costs are relative to a static or non-virtual method call, but I don't have any background with Obj-C to know how messages are sent. Browsing around I found this loose benchmark and it mentions IMP cached messages being faster than virtual function calls, which are in turn faster than a standard message send. I am not trying to optimize anything, just get deeper understanding of how exactly the messages get dispatched. How are Obj-C messages dispatched? How do Instance Method Pointers get cached and can you (in general) tell by reading the code if a message will get cached? Are class methods essentially the same as a C function (or static class method in C++), or is there something more to them? I know some of these questions may be 'implementation dependent' but there is only one implementation that really counts.

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• Excel VSTO ->Hide/Unhide Ribbon Button based on another Ribbon Button click

  - by Jignesh

  We are creating Excel 2007 AddIn using VSTO. Now we have a scenario where in there are 2 buttons. Button 'A' and Button 'B'. Button 'B'needs to be hidden based on the click on the button 'A'. But since the ribbon bar is not getting refreshed dynamically we are unable to see the change on the Ribbon Bar. I heard from some blods we need to use callback methods for the same. Could you please explain and put some code snippet on how to do that ? Will highly appreciate if anyone can help asap ...

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• Uploading images to a PHP server from Android

  - by Samuh

  I need to upload an image to a remote PHP server which expects the following parameters in HTTPPOST: *$_POST['title']* *$_POST['caption']* *$_FILES['fileatt']* Most of the internet searches suggested either : Download the following classes and trying MultiPartEntity to send the request: apache-mime4j-0.5.jar httpclient-4.0-beta2.jar httpcore-4.0-beta3.jar httpmime-4.0-beta2.jar OR Use URLconnection and handle multipart data myself. Btw, I am keen on using HttpClient class rather than java.net(or is it android.net) classes. Eventually, I downloaded the Multipart classes from the Android source code and used them in my project instead. Though this can be done by any of the above mentioned methods, I'd like to make sure if these are the only ways to achieve the said objective. I skimmed through the documentation and found a FileEntity class but I could not get it to work. What is the correct way to get this done in an Android application? Thanks.

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• Example of configuring wxStyledTextCtrl/wxScintilla control as code editor for custom language

  - by Greg

  How do you enable actions like Goto line number Find(/Replace) There don't appear to be default triggers for these actions. There are a bunch of methods on the control, but I'm missing the first step of how to get the 'events' that would trigger these. For instance, how does one hook ctrl+f or F3/Alt+F3 in the control and make them do a find? Should I be looking at each key using EVT_STC_KEY? Would also like any examples of using this control with Custom language definition (say something similar to C++, but not C++) Auto completion (basic keywords to start, or including variables)

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• Using WFC authentication service for web application

  - by user200295

  I am using a WFC authentication service I set up with a web application. I have successfully set up and tested the AuthenticationService and RolesService. The web application can successfully call methods like ValidateUser and GetRolesForCurrentUser through the WFC services. I want to integrate the WFC authentication service with my web.config and site.map. Do I need to write a custom provider, or is there some way I can modify the web.config of the web application to use the WFC authentication service as its membership provider? This way I can set what roles have access to what directories based off the WFC authentication service.

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• Is it possible to Embed Gecko or Webkit in a Windows Form just like a WebView?

  - by Martín Marconcini

  Hi, I'd love to know if there is such thing as a Gecko.NET ;) I mean, just like we can embed a WebView and that is an "instance" of IE7 inside any Windows Forms application (and tell it to "navigateto (fancy_url);", I'd love to use FireFox or WebKit. Anybody tried this? UPDATE: Please bear in mind that although it is possible to embed gecko using the mentioned controls, it is still impossible to print while using gecko. UPDATE March 2010: It’s still not possible to print natively using GeckoFX, however a couple of methods exist that may be enough, depending upon what you’re trying to do. See: http://geckofx.org/viewtopic.php?id=796 for more information.

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• Missing Java error on conditional expression?

  - by Federico Cristina

  With methods test1() and test2(), I get a Type Mismatch Error: Cannot convert from null to int, which is correct; but why am I not getting the same in method test3()? How does Java evaluates the conditional expression differently in that case? (obviusly, a NullPointerException will rise in runtime). Is it a missing error? public class Test { public int test1(int param) { return null; } public int test2(int param) { if (param > 0) return param; return null; } public int test3(int param) { return (param > 0 ? return param : return null); } } Thanks in advance!

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• Graphviz DOT arrange Nodes in circles, layout too "compact"

  - by Ivo Wetzel

  I'm halfway there please see the edit OK here's my problem, I'm generating a graph of a python module, including all the files with their functions/methods/classes. I want to arrange it so, that nodes gather in circles around their parent nodes, currently everything is on one gargantuan horizontal row, which makes the thing 50k pixels wide and also let's the svg converter fail(only renders about the half of the graph). I went trough the docs(http://www.graphviz.org/doc/info/attrs.html) but couldn't find anything that seems to do the trick. So the question is: Is there a simple way to do this or do I have to layout the whole thing by myself? :/ EDIT: Thanks to Andrews comment I've got the right layout, the only problem now is that it's a bit to "compact"... so the question now is, how to fix this?

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• Mapping table and a simple view with Fluent NHibernate

  - by adrin

  I have mapped a simple entity, let's say an invoice using Fluent NHibernate, everything works fine... after a while it turns out that very frequently i need to process 'sent invoices' (by sent invoices we mean all entities that fulfill invoice.sent==true condition)... is there a way to easily abstract 'sent invoices' in terms of my data access layer? I dont like the idea of having aforementioned condition repeated in half of my repository methods. I thought that using a simple filtering view would be optimal, but how could it be done? Maybe I am doing it terribly wrong and someone would help me realize it :)?

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• how to deep copy a class without marking it as serializable

  - by Gaddigesh

  I came across many questions on deep copy but non of them helped me I have a class say class A { ... public List<B> ListB; .... } where B is again another class which inturn may inherit/contain some other classes Take this scenario A is a very huge class and contain many reference types I can not mark B as serializable as i don't have access to source code of B(Though I can Mark A as serializable) Problem:below methods to perform deep copy does not work because I can not use Iclonable, memberwise clone technique as class A conatins many reference types I can not write a copy constructor for A , as the class is huge and keeps growing and contained classes (Like B) can't be deep copied I can't use serialization technique as i can not mark conatined class(like B, for which no source code avilaable) as serializable So how can I deep copy the object of Class A? (I read about "surrogate serialization" technique some where but not clear)

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• Core Location Best Placement and User Interruption

  - by b.dot

  Hi All, My application uses Core Location in three different views. It's working perfectly. In my first view, I subclass the CLLocationManager and use protocol methods for location updates to my calling class. Before I install the framework and code in my other classes, I was wondering: Is the protocol method the best way? What happens to the Core Location execution if the user exits the view or quits the app while it's trying to get a location fix? Is the location task terminated with the GPS system turned off immediately? If the user simply switches to another view, is it OK to assume that I can start Core Location in the next view without regard to the last? Where should the first update location call be placed. Should the application delegate instantiate the CLLocation Manager class using protocol so that it can update any of the views chosen or should each class instantiate the manager. Any feedback would be appreciated. Thanks.

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• describe class versions of primitive type data

  - by paula

  please some explain to me this.... Explain why java has class versios of primitive data types? describe the class versions of primitive java types and expain pros and cons? expalin why class versions of primitive java types are available, but why the primitive types are still frequently used? expalin how primitive and non-primitive data types are passed as parameters to methods in java and how that affects altering the value of data passed? primitve data types are: int, float, char, long, short, byte, boolean and double.

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• Can NSDictionary be used with TableView on iPhone?

  - by bobo

  In a UITableViewController subclass, there are some methods that need to be implemented in order to load the data and handle the row selection event: - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; //there is only one section needed for my table view } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [myList count]; //myList is a NSDictionary already populated in viewDidLoad method } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease ]; } // indexPath.row returns an integer index, // but myList uses keys that are not integer, // I don't know how I can retrieve the value and assign it to the cell.textLabel.text return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Handle row on select event, // but indexPath.row only returns the index, // not a key of the myList NSDictionary, // this prevents me from knowing which row is selected } How is NSDictionary supposed to work with TableView? What is the simplest way to get this done?

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• DataSource Control for List<T>

  - by diamandiev

  I know all the data source controls like LinqDataSource, ObjectDataSource etc. They are cool but they are intended to be used in conjunction with a database. I actually need a simple data source control that can work with a plain old List (That supports delete, update, select, insert ofcourse). I was thinking of using the objectdatasource but the select, update... methods are not present in the List. So is there such a control or do i have to roll my own? Should i inherit from the objectdatasource?

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• iPhone Core Data: request for member 'tableView' in something not a structure or union

  - by Nic Hubbard

  I am trying to use CoreData to populate a UITableView. I have been using the developer "Locations" project, and I think I have everything correct. But, now I am getting the following error when I build: request for member 'tableView' in something not a structure or union Why would it be confused about tableView? I am using it many times in the methods. The errors seem to be coming from: [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES]; Ideas?

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• iphone - testing if an object exists

  - by Mike

  I have several apps in my app that can become nil at some point and I have methods that in theory are used to put these objects to nil. But, if I try to put to nil an object that does not exist, the app will crash. for example... [object1 release]; object1 = nil; //... and after that [object removeFromSuperview]; // this will crash Then I thought, why not testing to see if the object exists before removing... if (object1 != nil) [object removeFromSuperview]; // this will crash too, because object1 cannot be tested for nil because it does not exist How can I check if the object exists before testing if it is nil? something as if (object exists( { if(object != nil)) [object removeFromSuperview) } is this possible?

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• Creating a specialised view filtering form in Rails

  - by Schroedinger

  G'day guys, I have a current set of data, and I generate multiple analyses of this data (each analysis into its own active record item called a pricing_interval) using a helper function at the moment. Currently to analyse the set of data, you need a start time(using datetime_select) an integer (using text_field) and a name (using text_field) I would like on submission of the form to be redirected to the index page of my pricing_interval, as the values will be re-generated. Manually generating a range proves that my helper methods work. How would I build a form that on submit would send parameters to a function in the form of (date,integer,name) so that it could immediately begin work whilst redirecting the user to server/pricing_intervals Anything at all would help, I've spent hours over the past few days trying to get the rails form syntax working properly to no avail, a really straightforward guide to what I would implement to get this working would be amazingly appreciated. I've looked through the form guides, as I'm not creating an object, but merely parsing params, there's got to be an easy way to do this, right?

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• How to Set a gridview column width when binding to a datatable

  - by Bob Avallone

  I am binding a table to a gridview in asp.net as such grdIssues.DataSource = mdtIssues; grdIssues.DataBind(); The problem is I cannot then control the column width, asp.net seems to decided on it's own what width each column should be. Methods such as grdIssues.Columns[0].ItemStyle.Width = 100; grdIssues.Columns[1].ItemStyle.Width = 100; don't work because the columns are created dynamically. I cannot believe there isn't a way to do this short of manually creating each column and filling each row. Regards, Bob Avallone

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