C# explicit interface implementation（显式接口实现）

C# explicit interface implementation

某个类要实现两个包含相同方法名的接口, 应该如何实现这两个方法？

 namespace ExplicitInterfaceImplementation
 {
     class Program : IPrintOne,IPrintTwo, IPrintThree
     {
         static void Main(string[] args)
         {
             Program p = new Program();
             p.Print();
             (p as IPrintTwo).Print();
             ((IPrintThree)p).Print();
         }

         public void Print()
         {
             Console.WriteLine("Print One Interface");
         }
         // explicitly implement IPrintTwo
         void IPrintTwo.Print()
         {
             Console.WriteLine("Print Two Interface");
         }
         // explicitly implement IPrintThree
         string IPrintThree.Print()
         {
             Console.WriteLine("Print two Interface");
             return "asd";
         }
     }

     interface IPrintOne
     {
         void Print();
     }

     interface IPrintTwo
     {
         void Print();
     }

     interface IPrintThree
     {
         string Print();
     }
 }

以上Demo中共有3个拥有相同方法名的interface，Program类继承了这三个接口，使用explicit interface implementation实现IPrintTwo和IPrintThree接口的方法

显示实现的接口方法前不能加access modifier，且调用该方法时需将Program类转换位接口才能调用， 不能直接通过类引用调用。

When a class explicitly implements an interface member, the interface member can no longer be accessed thru class reference variable, but only thru the interface reference variable.

以上Demo的运行结果：

Print One Interface　　
Print Two Interface　　
Print Three Interface