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  • Building an ASP.Net 4.5 Web forms application - part 4

    - by nikolaosk
    ?his is the fourth post in a series of posts on how to design and implement an ASP.Net 4.5 Web Forms store that sells posters on line.There are 3 more posts in this series of posts.Please make sure you read them first.You can find the first post here. You can find the second post here. You can find the third post here.  In this new post we will build on the previous posts and we will demonstrate how to display the posters per category.We will add a ListView control on the PosterList.aspx and will bind data from the database. We will use the various templates.Then we will write code in the PosterList.aspx.cs to fetch data from the database.1) Launch Visual Studio and open your solution where your project lives2) Open the PosterList.aspx page. We will add some markup in this page. Have a look at the code below  <section class="posters-featured">                    <ul>                         <asp:ListView ID="posterList" runat="server"                            DataKeyNames="PosterID"                            GroupItemCount="3" ItemType="PostersOnLine.DAL.Poster" SelectMethod="GetPosters">                            <EmptyDataTemplate>                                      <table id="Table1" runat="server">                                            <tr>                                                  <td>We have no data.</td>                                            </tr>                                     </table>                              </EmptyDataTemplate>                              <EmptyItemTemplate>                                     <td id="Td1" runat="server" />                              </EmptyItemTemplate>                              <GroupTemplate>                                    <tr ID="itemPlaceholderContainer" runat="server">                                          <td ID="itemPlaceholder" runat="server"></td>                                    </tr>                              </GroupTemplate>                              <ItemTemplate>                                    <td id="Td2" runat="server">                                          <table>                                                <tr>                                                      <td>&nbsp;</td>                                                      <td>                                                <a href="PosterDetails.aspx?posterID=<%#:Item.PosterID%>">                                                    <img src="<%#:Item.PosterImgpath%>"                                                        width="100" height="75" border="1"/></a>                                             </td>                                            <td>                                                <a href="PosterDetails.aspx?posterID=<%#:Item.PosterID%>">                                                    <span class="PosterName">                                                        <%#:Item.PosterName%>                                                    </span>                                                </a>                                                            <br />                                                <span class="PosterPrice">                                                               <b>Price: </b><%#:String.Format("{0:c}", Item.PosterPrice)%>                                                </span>                                                <br />                                                        </td>                                                </tr>                                          </table>                                    </td>                              </ItemTemplate>                              <LayoutTemplate>                                    <table id="Table2" runat="server">                                          <tr id="Tr1" runat="server">                                                <td id="Td3" runat="server">                                                      <table ID="groupPlaceholderContainer" runat="server">                                                            <tr ID="groupPlaceholder" runat="server"></tr>                                                      </table>                                                </td>                                          </tr>                                          <tr id="Tr2" runat="server"><td id="Td4" runat="server"></td></tr>                                    </table>                              </LayoutTemplate>                        </asp:ListView>                    </ul>               </section>  3) We have a ListView control on the page called PosterList. I set the ItemType property to the Poster class and then the SelectMethod to the GetPosters method.  I will create this method later on.   (ItemType="PostersOnLine.DAL.Poster" SelectMethod="GetPosters")Then in the code below  I have the data-binding expression Item  available and the control becomes strongly typed.So when the user clicks on the link of the poster's category the relevant information will be displayed (photo,name and price)                                            <td>                                                <a href="PosterDetails.aspx?posterID=<%#:Item.PosterID%>">                                                    <img src="<%#:Item.PosterImgpath%>"                                                        width="100" height="75" border="1"/></a>                                             </td>4)  Now we need to write the simple method to populate the ListView control.It is called GetPosters method.The code follows   public IQueryable<Poster> GetPosters([QueryString("id")] int? PosterCatID)        {            PosterContext ctx = new PosterContext();            IQueryable<Poster> query = ctx.Posters;            if (PosterCatID.HasValue && PosterCatID > 0)            {                query = query.Where(p=>p.PosterCategoryID==PosterCatID);            }            return query;                    } This is a very simple method that returns information about posters related to the PosterCatID passed to it.I bind the value from the query string to the PosterCatID parameter at run time.This is all possible due to the QueryStringAttribute class that lives inside the System.Web.ModelBinding and gets the value of the query string variable id.5) I run my application and then click on the "Midfilders" link. Have a look at the picture below to see the results.  In the Site.css file I added some new CSS rules to make everything more presentable. .posters-featured {    width:840px;    background-color:#efefef;}.posters-featured   a:link, a:visited,    a:active, a:hover {        color: #000033;    }.posters-featured    a:hover {        background-color: #85c465;    }  6) I run the application again and this time I do not choose any category, I simply navigate to the PosterList.aspx page. I see all the posters since no query string was passed as a parameter.Have a look at the picture below   ?ake sure you place breakpoints in the code so you can see what is really going on.In the next post I will show you how to display poster details.Hope it helps!!!

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  • BuildManager.CreateInstanceFromVirtualPath ignores compiled code

    - by Vnuk
    This question is related to http://stackoverflow.com/questions/2158425/why-cant-i-publish-mvc-project I've replaced System.Web.MVC with its source version. After some debugging I pinpointed my problem to line 50 of WebFormViewEngine.cs: protected override bool FileExists(ControllerContext controllerContext, string virtualPath) { try { object viewInstance = BuildManager.CreateInstanceFromVirtualPath(virtualPath, typeof(object)); return viewInstance != null; } For reasons unknown to me, BuildManager.CreateInstanceFromVirtualPath tries to find masterpage.aspx.vb file which does not exist because MVC application is published. What makes BuildManager.CreateInstanceFromVirtualPath behave this way, and how to debug? I've tried this with new blank MVC project. After publishing it and stopping at above location, BuildManager.CreateInstanceFromVirtualPath creates an instance without trying to compile anything.

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  • How To debug Android app on Emulator using NetBeans IDE

    - by tobrien
    I recently downloaded the latest NetBeans IDE (for MACOSX) and imported/migrated a project over from the ECLIPSE environment. Everything looks, and works well... except that EMULATOR gets stuck "waiting for the debugger to attach." I tried "Attaching Debugger..." and set the PORT value to every case I've ever read about (8200, 8700, 5555, etc.) but the connection is refused. I am of the opinion that this is not the preferred way to start a debugging session in NetBeans for Android. What am I missing?

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  • pdb show different variable values than print statements

    - by martin
    Hi, everyone. I am debugging a python module with homemade c extensions. The output seems correct when I print it with 'p' in pdb. But if I use a normal print statement or pickle it, the output is wrong. What could be causing pdb to show different values than normal execution? I can even step to the print statement in debug mode, and pdb will show the correct value but the program will print the wrong one. The problem seems to happen only when I have called a certain c extension earlier. Glad to post code if that helps. Thank you.

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  • eclipse debugger: attaching source-code of maven managed libraries

    - by meriton
    I'd like to use the source code of maven-managed dependencies when debugging our webapp in eclipse. I have managed to attach the sources to the libraries in the "Maven Managed Depedencies" classpath container, i.e. when I open a class file from a depedency (e.g. using Ctrl-Shift-T), I see the source code. However, when I launch the tomcat within eclipse, and execution halts on a breakpoint in that same class, the editor pane only displays the text "source not found", and a button to edit the "source lookup path". I have attempted to manually add the "Maven Managed Dependencies" classpath container, only to be told "Use maven project settings to configure depedency resolution". However, I see no useful setting in that property pane ... How can I attach those sources?

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  • clicking the debug button in Eclipse will not start debug mode

    - by iHorse
    i am running Eclipse 3.5.0 on a MacBook Pro using the Android SDK. i noticed that on this particular project i am working on i cant seem to actually enter debug mode. i click the little green bug icon in the tool bar and the app starts and runs. but if i switch over to the Debug Perspective i see no indication that it is running in debug mode. furthermore i can not hit any brake points that i have set. this makes debugging code a bit hard. Other projects that i am working on don't have this issue. any ideas on what i need to change in the project to get this to work?

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  • How does a debug build make reverse engineering easy?

    - by danny
    Some answer here stated that debug info would make it easier to reverse engineer the software. When I use Visual C++ and distribute an executable with debugging information but without other files (.pdb), will it contain any interesting things? I looked to the executable with a hex editor and found nothing like symbol names, for now I assume the .exe file just links to information in the .pdb files, right? Do you know whether it contains variable names? function/member names? line numbers? anything interesting? Thanks!

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  • Core dump equivalence for Java

    - by m3rLinEz
    So far I have learned about generating thread dump and heap dump using jstack and and jmap respectively. However, jstack thread dump contains only texts describing the stack on each thread. And opening heap dump (.hprof file) with Java VisualVM only shows the objects allocated in the heap. What I actually want is to be able see the stack, to switch to particular stack frame, and watch local variables. This kind of post-mortem debugging can be done normally with tools like WinDbg, gdb and a core file (for a native C++ program.) I wonder if such 'core' file (which will allow me to debug in non-live environment) exists in Java?

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  • Performance analysis strategies

    - by Bernd
    I am assigned to a performance-tuning-debugging-troubleshooting task. Scenario: a multi-application environment running on several networked machines using databases. OS is Unix, DB is Oracle. Business logic is implemented across applications using synchronous/asynchronous communication. Applications are multi-user with several hundred call center users at peak time. User interfaces are web-based. Applications are third party, I can get access to developers and source code. I only have the production system and a functional test environment, no load test environment. Problem: bad performance! I need fast results. Management is going crazy. I got symptom examples like these: user interface actions taking minutes to complete. Seaching for a customer usually takes 6 seconds but an immediate subsequent search with same parameters may take 6 minutes. What would be your strategy for finding root causes?

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  • changing Python code in the debugger

    - by max
    Is there any debugger that allows Python code to be changed while debugging? In other words: run-time exception occurs, debugger stops, I change the code any way I like, and tell the program to continue. I am aware of the problems with this approach, such that references to functions would still point to the old definitions if I redefine the function on the fly, and so on. I am ok with that, since I just want to be able to make small fixes in very simple circumstances. On the other hand, I'm also interested in whether it's theoretically possible to allow changes to Python code without running into these problems: i.e., somehow update all the references to the objects that changed, etc. I'm nearly sure the answer to the second question is no, but if I'm wrong, I'd like to know. EDIT: If my goal (changing the code interactively when an exception occurred, and then continuing execution), is achievable without a debugger - that would be good as well. I don't need to use the debugger.

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  • Reading Stacktrace in Objective-C?

    - by yar
    I don't like real-time debugging much, but if it's necessary I'll do it. Is there any way to figure out what line of code a StackTrace in Objective-C refers to? What about the variable it refers to? For instance: 2010-05-13 19:39:11.673 Thingers[21003:207] *** -[NSCFString count]: unrecognized selector sent to instance 0x3b0ebb0 2010-05-13 19:39:11.674 Thingers[21003:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString count]: unrecognized selector sent to instance 0x3b0ebb0' 2010-05-13 19:39:11.675 Thingers[21003:207] Stack: ( 29303899 ... 11130 ) I see that we're talking about sending a count message to something that doesn't have it (maybe it's a NSCFString?), but is there any way to figure out what a/the named reference to that instance (0x3b0ebb0) refers to?

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  • null != null - any ideas on how to re-arrange the code or prevent this?

    - by Alex
    Currently debugging, and found an if-statement which for no (I thought...) reason gave me an NPE, obviously for a reason. Which seemed to be that the statement turned out to be if(false && (null != null || null != Color)). if(destination != null && (destination.getPiece() != null || destination.getPiece().getColour() != pieceColour)) - the if-statement Both destination can be null and piece can be. The getColour() method returns an attribute of type Color from piece, which must be null if the piece is null. The piece at destination has a different pieceColour attribute then the one in the if-statement. Specifically, how do I re-arrange (destination.getPiece() != null) ?

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  • Is there any way to set or code breakpoints conditionally?

    - by froadie
    I've been wondering this for a while - is there a way to code/program breakpoints...? Conditionally? For example, can I specify something like - "when this variable becomes this value, break and open the debugger"? (Would be quite useful, especially in long loops when you want to debug loop execution of a late loop value.) I suppose this may be IDE-specific since debugging is implemented differently in different IDEs... I'd be interested to know how to do this in any IDE, but specifically in Eclipse and Visual Studio.

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  • Interactive pyDev console at breakpoint

    - by fest
    I'm using Aptana Studio with Pydev 1.5.3 to debug my Django applications. I use PyDev's remote debugger and some code in manage.py and for most of the time this setup is working successfully- I can set breakpoints, inspect variables and step/continue through my code. However, I'd like to execute arbitrary code at the breakpoint- the thing I really miss after switching from pdb to Eclipse debugging. There is an interactive console available in debug perspective but it is inactive for me. So my question- is it possible to set up an interactive console in PyDev with remote debugger which could "inject" code at breakpoint?

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  • How to debug GWT using Ant

    - by Phuong Nguyen de ManCity fan
    I know that the job would be simpler if I use Google Plugin for Eclipse. However, in my situation, I heavily adapted Maven and thus, the plugin cannot suit me. (In fact, it gave me the whole week of headache). Rather, I relied on a ant script that I learned from http://code.google.com/webtoolkit/doc/latest/tutorial/appengine.html The document was very clear; I follow the article and successfully invoked DevMode using ant devmode. However, the document didn't tell me about debugging GWT (like Google Plugin for Eclipse can do). Basically, I want to add some parameter to an ant task that expose a debug port (something like (com.google.gwt.dev.DevMode at localhost:58807)) so that I can connect my eclipse to. How can I do that?

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  • How to debug a GWT application running on OSGi?

    - by Jaime Soriano
    I'm developing a web UI using GWT. While working only with the widgets I could debug from Eclipse using the Firefox extension, but now that I'm integrating the UI with other OSGi bundles I cannot use this solution. For deploying the GWT application I create the .war and convert it to an OSGi bundle using BND. Then I launch the OSGi container with all the bundles using Pax Runner and Pax Web and the application works correctly, but when something fails in the generated javascript code I don't have any decent output error or debugging facility. Is there any way to launch the GWT application in "debug mode" from OSGi? Any other idea that could help in this scenario?

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  • JavaScript data formatting/pretty printer

    - by Dan
    I'm trying to find a way to 'pretty print' a JavaScript data structure in a human-readable form for debugging. I have a rather big and complicated data structure being stored in JS and I need to write some code to manipulate it. In order to work out what I'm doing and where I'm going wrong, what I really need is to be able to see the data structure in its entirety, and update it whenever I make changes through the UI. All of this stuff I can handle myself, apart from finding a nice way to dump a JavaScript data structure to a human-readable string. JSON would do, but it really needs to be nicely formatted and indented. I'd usually use Firebug's excellent DOM dumping stuff for this, but I really need to be able to see the entire structure at once, which doesn't seem to be possible in Firebug. Any suggestions welcome, thanks in advance.

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  • Deliberately adding bugs to assess QA processes

    - by bgbg
    How do you know that as many bugs as possiblle have been discovered and solved in a program? Couple of years ago I have read a document about debugging (I think it was some sort of HOWTO). Among other things, that document described a technique in which the programming team deliberately adds bugs into the code and passes it to the QA team. The QA process is considered completed when all the deliberately known bugs have been discovered. Unfortunately, I cannot find this document, or any similar one with description of this trick. Can someone please point me to such a document?

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  • Is it possible to change where things are in Chrome's Developer Tools Script panel?

    - by T.J. Crowder
    When debugging browser-based apps using Google Chrome's Developer Tools, is there a way to change the locations of the various panes? Specifically in the Scripts panel (though I suppose it's a general question). E.g., the Watch Expressions, the Call Stack, the code pane, etc.? The defaults are okay (console at bottom, code pane upper left, a column of Watch Expressions, Call Stack, Scope Vars, etc. in the upper right), but I'd rather swap things around a bit if it's possible. There doesn't seem to be anything to grab (other than for sizing) and I haven't found a way in my searching so far, but there are (still) some things about Chrome's options that aren't ... well-advertised in the UI, shall we say :-), especially around developer tools.

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  • Unreachable breakpoint at execut(able/ing) code

    - by shadeMe
    I've got two DLLs, one in written in native C++ and the other in C++/CLI. The former is injected into a process, and at a later point in time, loads the latter. While debugging, I noticed that the native DLL's breakpoints were functioning correctly while the other's weren't, even though its code was being executed. The breakpoints showed this message: This breakpoint will not be hit. No executable code associated with this line. Possible causes include: preprocessor directives or compiler/linker optimizations. The modules window tells me that the plugin's symbols are loaded. I'm running with its DEBUG build. Any ideas on why this is so and perhaps a fix ?

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  • Why does the release build of my iPhone app crash on the device on the first run after installation?

    - by Chris Cooper
    I have an iPhone app that's been in development for about 2 weeks. We recently tried the "release" version of the build on a device, and to our great unhappiness, it crashes in one of the views with an "EXC_BAD_ACCESS". This crash only occurs on devices, and only in the "release" build. Not only that, but it only happens the first time the app is launched! It is also 100% reproducible. We have removed the small block of code that deals with data persistence, and have tried re-openning Xcode, cleaning the project, deleting and reinstalling the app, etc., as some other questions suggest. Do you have any advice for a) what might be causing this problem, and b) how to go about debugging if it only happens in "release"? Thanks

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  • Unhandled exceptions in BackgroundWorker

    - by edg
    My WinForms app uses a number of BackgroundWorker objects to retrieve information from a database. I'm using BackgroundWorker because it allows the UI to remain unblocked during long-running database queries and it simplifies the threading model for me. I'm getting occasional DatabaseExceptions in some of these background threads, and I have witnessed at least one of these exceptions in a worker thread while debugging. I'm fairly confident these exceptions are timeouts which I suppose its reasonable to expect from time to time. My question is about what happens when an unhandled exception occurs in one of these background worker threads. I don't think I can catch an exception in another thread, but can I expect my WorkerCompleted method to be executed? Is there any property or method of the BackgroundWorker I can interrogate for exceptions?

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  • How do you update the server name in source indexed symbol file?

    - by Keith Hill
    With the Debugging Tools for Windows you can run SSIndex.cmd against your symbol files and it will embed the command to retrieve each source code file from the TF server. We have a bunch of indexed files and recently our IT migrated our TFS 2008 installation to TFS 2010 and in the process changed the server name. Question is, how can I update all these symbol files to point to the new server? I thought SSindex used an alternate data stream named 'srcsrv' but SysInternals' streams.exe shows nothing on these symbol files even though srctool.exe shows the data.

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  • Source Lookup Path is correct but debugger can't find file (Eclipse EE IDE)?

    - by Greg McNulty
    When debugging stepping over each line does work. Stepping into a function located in another file debugger displays: Source not found. Also displays option for Edit Source Lookup Path... but the correct package is listed there. (Also tried pointing with the directory path.) No other breakpoints set, as is a common solution. Any point in the right direction is helpful. Thank You. Thread[main] in the debugger window: Thread [main] (Suspended) ClassNotFoundException(Throwable).<init>(String, Throwable) line: 217 ClassNotFoundException(Exception).<init>(String, Throwable) line: not available ClassNotFoundException.<init>(String) line: not available URLClassLoader$1.run() line: not available AccessController.doPrivileged(PrivilegedExceptionAction<T>, AccessControlContext) line: not available [native method] Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: not available Launcher$ExtClassLoader.findClass(String) line: not available Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: not available Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: not available Launcher$AppClassLoader.loadClass(String, boolean) line: not available Launcher$AppClassLoader(ClassLoader).loadClass(String) line: not available MyMain.<init>() line: 24 MyMain.main(String[]) line: 36

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