Question

I am really newbie to c# and VS2010. :-\

I have a "pure" Winforms application. Or at least I think so.

But suddenly (with the last changes to the source code) I have this error when build an auxiliary DLL:

Error 7
The type
‘System.Windows.Interop.HwndHost’ is
defined in an assembly that is not
referenced. You must add a reference
to assembly ‘PresentationFramework,
Version=3.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35′. D:\MyprojectPath\SharedExceptions.cs AuxLibraryProject

I don’t want to add PresentationFramework.dll to the project and even when I have tried to add it then a lot of other assemblies are required. 🙁

I want to know WHERE is the guilty of this assembly requirement. I will be happy to blame some line on my source code but I cannot find it.

The SharedExceptions.cs is one of the files changed but when I (manually) delete all changes, the error persists.

This same assembly compiles fine on a Windows XP Visual Studio 2010 system. But not on Windows Vista.

---

Update:

I have left alone the parent exception for all others. All other are on other files. After rebuild, the error remains on the same file. Here is the little source code. I cannot see anything requiring the new assembly:

using System;

    namespace PROJECT.AuxLibraryProject
    {
        public class SharedExceptionParent: Exception
        {
             public string ErrorMessage
             {
                 get
                 {
                     return base.Messsage.ToString();
                 }
             }
             public SharedExceptionParent() { }
             public SharedExceptionParent(string errorMessage) : base(errorMessage) { }
             public SharedExceptionParent(string errorMessage, Exception innerEx) : base(errorMessage, innerEx) { }
        }
    }

Answer 1

I have found it:

This line on top of namespace keyword on two assemblies was the culprit:

[assembly: CLSCompliant(true)]

I have deleted this line on both assemblies and all builds fine now.

Greetings.