c# – 我们可以使用接口变量调用其接口中未定义的实现类中的方法

interface ILookup {
            public void someInterfaceMethod1();
            public void someInterfaceMethod2();
}

……和实施类：

public class extendedLookUpImplementor: ILookup
{
          //constructor
          LookUpImplementor(){
          }

          public void someInterfaceMethod1(){
           // Implementation Code here.
          }

          public void someInterfaceMethod2(){
           // Implementation Code here.
          }

          public void ExtendedMethod(){
           // Implementation Code here.
          }

}

在客户端代码中：

ILookup lookupVar = new LookUpImplementor();
lookupVar -> someInterfaceMethod1(); // i know it will work.
lookupVar -> someInterfaceMethod2(); // i know it will work.

我的问题是,我可以使用lookupVar调用ExtendedMethod,如下所示：

lookupVar -> ExtendedMethod(); // Note again that ExtendedMethod() is not defined in Ilookup interface/contract.