为了开发一个简单的Client程序界面，我在VS2010中使用了《WeifenLuo.WinFormsUI.Docking.dll》，确实不错，很简单但却可以做出不错的界面。



但是在使用的时候却出现了些小问题，每当我从toolbox中向Form上拖拽DockPanel的时候总会弹出"Type universe cannot resolve assembly"这个错误。参考了别的程序，都没有问题，遂上网搜索，花费了不少时间，总算找到了原因。原来是项目属性里面的默认设置有问题。-If you find this error message confusing, it is simply due to the fact that you did not read it with the correct understanding of the "Type universe."　You see, the Type universe is, evidently, the collection of all the types and assemblies in the deployment framework.　In other words, System.Design.dll could not be found in the target framework for the application.