关系继承的属性重名问题

Question

public interface classA
        {
            string User
            {
                get;
                set;
            }
        }

public interface classB
        {
            string User
            {
                get;
                set;
            }
        }

public interface facs : classA, classB
        {

        }

public class classC
{
      public facs dd;
}

classC c = new classC();
c.dd.User = "dd";

错误：Error 2 Ambiguity between 'classA.User' and 'classB.User' 

这类问题如何解决？问题原型在一个系统dll中

Answer 1

facs是dll的还是可以改写的？可以改的话，可以先继承classA，覆盖下属性，在继承classB