该类型在未引用的程序集中定义

Question

I've just begun incorporating a few projects from a partner office's solution into our solution. The program is a C# winform application.

The program compiled and everything was going fine, but then yesterday I went to build again and out of nowhere it threw an error "The type 'Namespace.MainFrameDisplay' is defined in an assembly that is not referenced. You must add a reference to assembly 'OtherAssembly, Version=1.7.0.0, Culture=neutral, PublicKeyToken=52af1880d3cd7291" (As far as I can tell, OtherAssembly isn't used as a reference in the original project. There are compatibility issues between Assembly and OtherAssembly, adding OtherAssembly nets about 100 errors.)

As well as a related error "Cannot implicitly convert type 'Namespace.MainFrameDisplay' to 'Namespace.MainFrameDisplay' [c:\\Dev\\program\\bin\\debug\\Assembly.dll]

A snippet of psuedo-code for the error is:

private MainFrameDisplay _MainFrame;  //definition
_MainFrame = this.Mainframe;  // error is thrown here
_MainFrame.Parent.Controls.Add(_NotifyBar);

If I delete the definition, the error remains.
If I take out the line where the error is thrown, it compiles fine. Even with calling the _MainFrame.Parent.

I've gone so far as to delete/remove this troublesome project and unzip/add a new copy of the original, but the problem remains. Any thoughts, suggestions?

Answer 1

Well........... Of course I figured this out right after posting.

( -_- )

So let's call this a tip for posterity.

In the code above, "this" references a base class, which is one of the other projects that I'm bringing into our solution. I compared the references of the original base class project to my version, and sure enough I had accidentally included a Reference to "OtherAssembly" rather than "Assembly." (Their real names are very similar.)

The incorrect reference didn't cause any problems in the base class, but caused a conflict in the derived class. Switched, fixed, compiled successfully.