错误18类型“System.Configuration.Provider.ProviderBase”在未被引用的程序集中定义。必须添加对程序集“System.Configuration,Version=2.0.0.0,Culture=neutral,PublicKeyToken=b03f5f7f11d50a3a”的引用。E:\yangyu\test3\codesmithAndsubsonic\CanYou.study3.threeTruss\CanYou.study3.ThreeTruss.DAL\AllStructs.cs5810CanYou.study3.ThreeTruss.DAL

在类库中添加subsonic.dll引用时,不要忘了添加system.configuration引用!