无法在Windows服务中引用dll

Question

I've created a windows service in VS 2010 which references the model conveniently placed in a separate project which compiles to a dll. I have no problem referencing this dll in other parts of my solution (web apps), but in my windows services the following symptoms display:

1. Compiler error: The type or namespace %%% cannot be found (are you missing....
2. I add a reference to %%% (directly to a dll copy or to the project, makes no difference).
3. The compile error dissapears.
4. I build.
5. The compile error reappears.

Using fw4.

What's up with that?

Edit: I can add and use other dlls ofcourse. Third party and microsoft's.

Answer 1

清除已创建的Debug＆Release文件夹，然后尝试执行完整的“ Rebuild”

Answer 2

Always check your warning messages.

System.Web.Extensions Assembly cannot be resolved