How to debug asp.net mvc 4 source code?如何调试asp.net mvc4 源代码？

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I download the latest source code from here:http://aspnetwebstack.codeplex.com/SourceControl/list/changesets

1) add the system.web.mvc project to my Solution including other projects that system.web.mvc project depends on.

2) change the reference of system.web.mvc assembly in the "CollaborativeDesign.WebUI","CollaborativeDesign.Domain","CollaborativeDesign.UnitTest" project from the GAC one to the system.web.mvc project.

3) change the root Web.config file as following show:

4) change the Web.config file in the "View" directory as following show:

<!--<pages validateRequest="false" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">  <controls>    <add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />  </controls></pages>--><pages validateRequest="false" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null" pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null" userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null">    <controls>        <add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null" namespace="System.Web.Mvc" tagPrefix="mvc" />    </controls></pages>

5) when I run the project, it looks like still using the GAC system.web.mvc.dll, because when I set the breakpoint in the "Controller.cs" file which is in the "system.web.mvc" project, it shows that it doesn't load any symbol for the document, and I also can't step into the method of mvc source code.

How can I debug the source code ? How can I know that the loaded system.web.mvc.dll is the GAC one or my local one ?

Accroding to the @Rick.Anderson-at-Microsoft.com's comment, I have been resolve this problem by doing the following additional steps:

1> Run "sn.exe -Vr *,31BF3856AD364E35" in the Visual Command line

2> Change the "AssemblyVersion" and "AssemblyFileVersion" in the CommonAssemblyInfo.cs which is in the System.Web.Mvc project from "4.0.0.0" to "4.0.0.1". Rebuild the project.

3> Change the Web.config file in the root directory

4> Change the Web.config file in the View directory

5> Restart the Asp.net Development Server. Ok, enjoy the source code! Thank @Rick.Anderson-at-Microsoft.com for the comment.