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POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
 

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  1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
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    <p>I was checking whether installing .NET 4.5 on our build machines changes the output IL image generated by VS 2010.</p> <p>Since I know the behaviour of foreach has changed in .NET 4.5 to avoid issues due to <a href="http://blogs.msdn.com/b/ericlippert/archive/2009/11/12/closing-over-the-loop-variable-considered-harmful.aspx" rel="nofollow noreferrer">Access to Modified closure</a>, I chose a simple application that exhibited the behaviour.</p> <pre><code> class Program { private static void Main(string[] args) { var contents = new List&lt;Func&lt;int&gt;&gt;(); var s = new StringBuilder(); int[] values = new int[] { 4, 5, 6 }; foreach (int value in values) { contents.Add(() =&gt; value); } for (var k = 0; k &lt; contents.Count; k++) s.Append(contents[k]()); Console.WriteLine(s); } </code></pre> <p><strong>VS 2010 output</strong>: 666</p> <p><strong>VS 2012 output</strong>: 456</p> <p>I created a console application in VS 2010 and a console application with the same code in VS 2012 (both targeted .NET 4).</p> <p>However, both the console applications exhibited different behaviours based on the IDE they were built with. In the build output, I checked that both had nearly similar build arguments. So I was wondering how the end executable exhibited different behaviour? .NET 4.5 is an in-place upgrade, so the compiler for both IDEs must be the same.</p> <p>NOTE: I did have a look at a related question: <a href="https://stackoverflow.com/questions/13327224/different-linq-answer-in-vs-2010-and-vs-2012">Different LINQ Answer in VS 2010 and VS 2012</a> but it did not answer my question on why the executable behaviour differed. </p> <p><strong>EDIT 1:</strong> As <a href="https://stackoverflow.com/users/65235/mletterle">mletterle</a> mentioned, I did try building the code using the commandline in the output window of VS 2010 in a VS 2010 command prompt. The resulting output behaved as if it was built with VS 2012.</p> <p><strong>EDIT 2:</strong></p> <p>I am posting the output present in Output Window:</p> <p><strong>VS 2010:</strong> Build started 12/20/2012 11:04:56 PM.</p> <blockquote> <p>CoreClean: Creating directory "obj\x86\Debug\". GenerateTargetFrameworkMonikerAttribute: Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files. CoreCompile:<br> C:\Windows\Microsoft.NET\Framework\v4.0.30319\Csc.exe /noconfig /nowarn:1701,1702 /nostdlib+ /platform:x86 /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:en-US /highentropyva- /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Microsoft.CSharp.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Data.DataSetExtensions.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Data.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Xml.Linq.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\x86\Debug\TestConsoleApp.exe /target:exe /utf8output Program.cs Properties\AssemblyInfo.cs "C:\Users\105044960\AppData\Local\Temp.NETFramework,Version=v4.0.AssemblyAttributes.cs" _CopyAppConfigFile: Skipping target "_CopyAppConfigFile" because all output files are up-to-date with respect to the input files. CopyFilesToOutputDirectory: Copying file from "obj\x86\Debug\TestConsoleApp.exe" to "bin\Debug\TestConsoleApp.exe". TestConsoleApp -> C:\Users\105044960\Documents\Visual Studio 2010\Projects\TestConsoleApp\TestConsoleApp\bin\Debug\TestConsoleApp.exe Copying file from "obj\x86\Debug\TestConsoleApp.pdb" to "bin\Debug\TestConsoleApp.pdb".</p> </blockquote> <p><strong>VS 2012:</strong></p> <blockquote> <p>1>CoreClean: 1> Deleting file "c:\users\105044960\documents\visual studio 11\Projects\TestConsoleApp\TestConsoleApp\bin\Debug\TestConsoleApp.exe". 1> Deleting file "c:\users\105044960\documents\visual studio 11\Projects\TestConsoleApp\TestConsoleApp\bin\Debug\TestConsoleApp.pdb". 1> Deleting file "c:\users\105044960\documents\visual studio 11\Projects\TestConsoleApp\TestConsoleApp\obj\Debug\TestConsoleApp.csprojResolveAssemblyReference.cache". 1> Deleting file "c:\users\105044960\documents\visual studio 11\Projects\TestConsoleApp\TestConsoleApp\obj\Debug\TestConsoleApp.exe". 1> Deleting file "c:\users\105044960\documents\visual studio 11\Projects\TestConsoleApp\TestConsoleApp\obj\Debug\TestConsoleApp.pdb". 1>GenerateTargetFrameworkMonikerAttribute: 1>Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files. 1>CoreCompile: 1> C:\Windows\Microsoft.NET\Framework\v4.0.30319\Csc.exe /noconfig /nowarn:1701,1702,2008 /nostdlib+ /platform:AnyCPU /errorreport:prompt /warn:4 /define:DEBUG;TRACE /errorendlocation /preferreduilang:en-US /highentropyva- /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\Microsoft.CSharp.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\mscorlib.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Core.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Data.DataSetExtensions.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Data.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Xml.dll" /reference:"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Xml.Linq.dll" /debug+ /debug:full /filealign:512 /optimize- /out:obj\Debug\TestConsoleApp.exe /target:exe /utf8output Program.cs Properties\AssemblyInfo.cs "C:\Users\105044960\AppData\Local\Temp.NETFramework,Version=v4.0.AssemblyAttributes.cs" 1>CopyFilesToOutputDirectory: 1> Copying file from "obj\Debug\TestConsoleApp.exe" to "bin\Debug\TestConsoleApp.exe". 1> TestConsoleApp -> C:\Users\105044960\Documents\Visual Studio 11\Projects\TestConsoleApp\TestConsoleApp\bin\Debug\TestConsoleApp.exe 1> Copying file from "obj\Debug\TestConsoleApp.pdb" to "bin\Debug\TestConsoleApp.pdb".</p> </blockquote>
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    1. USGanesh R.
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      1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
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    2. VO
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      1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
      1. USJohn Saunders
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    1. COWhat is the different behavior each exhibits?
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      1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
      1. USAndrew Barber
    2. COEr, why exactly are you surprised? You linked to a blog post explaining the different behavior...
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      1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
      1. USjalf
    3. CO@jalf The same code targeting the same .NET version on the same machine is giving different outputs depending on the IDE version is use.
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      1. POWhy is there a difference in behaviour of an application built in VS 2010 v.s. VS 2012?
      1. USGanesh R.
 

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