SilverLight中 Error Circular base class dependency involving XXX...的错误

今天在Silverlight中，新增一个Domain Service，然后名称就叫DomainService，一编译，出错如下。

Error 1 Circular base class dependency involving 'TestQuery.Web.DomainContext' and 'TestQuery.Web.DomainContext' D:\Source_Codes\TEST\TestQuery\TestQuery\Generated_Code\TestQuery.Web.g.cs 86 33 TestQuery

原来是因为The inheritance list for a class includes a direct or indirect reference to itself. A class cannot inherit from itself.

例如这样就会出错：

namespace MyNamespace
{
   public interface InterfaceA
   {
   }

   public class MyClass : InterfaceA, MyClass2
   {
      public void Main()
      {
      }
   }

   public class MyClass2 : MyClass   // CS0146
   {
   }
}