The DLL is already referenced in draft. NET, but the compilation error cannot find the type or namespace

Today, the code in the project, the need to put other people's DLL into the project (very old), but has been reported to find no namespace or type of error, there is no way to go down.

1. Guess where you don't know, let others help solve it, and ultimately the problem is beyond the scope of our understanding to fail.

2. Guess is my vs problem, so for other people's computer or the same error, this can eliminate the abnormal factors.

3. Ask someone to help, when they are not at the end of the time, I suddenly think of the recently seen. NET version of things, hurriedly verify, found that their calling program is running on 2.0, DLL is I only compile 4.0, are modified into 4.0 after the introduction of the namespace, done.

Summary: The features of the. NET Framework version are still unclear and need to be studied again.

This article is from the "more efforts, the more Fortunate" blog, please be sure to keep this source http://actor.blog.51cto.com/1764681/1594042

The DLL is already referenced in draft. NET, but the compilation error cannot find the type or namespace