Project Reference Problem, Visual Studio 2010
问题 I have a solution that has one class library project, and the others are WPF applications. I have added class library's reference the but, but both of them cannot use its classes. So, what is the problem? NOTE: sorry for tags, it's safari's problem. 回答1: Make sure that all your projects target same Framework. It may be a case that your library class project targets full .Net Framework 4.0 while your wpf projects target .Net Framework 4.0 Client Profile. To do that go to project properties of