Debug and Fixing ObjectDisposedException in Visual Studio 2010

Question

When editing a XAML file I noticed the following error:

System.ObjectDisposedException occurred
  Message=Cannot access a disposed object.
Object name: 'FileCodeModel'.

To debug this I ran another instance of Visual Studios and "Debug-> Attach to Process" to the instance of visual studio where the exception was shown.

I was able to catch the exception in the new Instances that started that is attached to the process. I catch the following exception:

System.ObjectDisposedException occurred
  Message=Cannot access a disposed object.
Object name: 'FileCodeModel'.
  Source=Microsoft.VisualStudio.CSharp.Services.Language
  ObjectName=FileCodeModel
  StackTrace:
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CFileCodeModel.GetCompilation(Boolean fBlockForParses)
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CPartialTypeCollection.EnumerateParts()
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CPartialTypeCollection.get_Count()
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CSlowSnapshot..ctor(CodeElements collection)
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CPartialTypeCollection.CreateSnapshot()
       at Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CCollectionBase.GetEnumerator()
       at EnvDTE.CodeElements.GetEnumerator()
       at MS.Internal.VSSymbols.SymbolProvider.GetProperties(String fullName, Boolean isTypeDefinition, Boolean useCodeModel)
       at Microsoft.Xaml.Symbols.IXamlSymbols.GetProperties(String typeName, Boolean isTypeDefinition, Boolean useCodeModel)
       at MS.Internal.Design.Markup.HostedType.BuildProperties(Boolean useCodeModel)
  InnerException: 

Anybody ever run into this exception in your XAML, and what do you do to fix it.

Answer 1

Are you running a XAML beautifier? - I've had something similar with an extension that cleans XAML up.

Answer 2

This happened to me when I manually grouped a .xaml.cs and .xaml file by editing the .csproj file. To fix this I:

1. Moved .xaml file to different folder.
2. Opened up solution.
3. Removed .xaml from project.
4. Re-created .xaml file in Visual Studio.
5. Copied the contents of my original .xaml into the newly created .xaml.

After following these steps I no longer got that error message.