.NET 擴展方法

• 擴展方法

• 限制條件

• 代碼示例

 DefineIMyInterface
{
     System;
      IMyInterface
    {
         MethodB();
    }
}
 Extensions
{
     System;
     DefineIMyInterface;
       Extension
    {
           MethodA( IMyInterface myInterface,  i)
        {
            Console.WriteLine
                ();
        }
           MethodA( IMyInterface myInterface,  s)
        {
            Console.WriteLine
                ();
        }
           MethodB( IMyInterface myInterface)
        {
            Console.WriteLine
                ();
        }
    }
}
 ExtensionMethodsDemo1
{
     System;
     Extensions;
     DefineIMyInterface;
     A : IMyInterface
    {
          MethodB() { Console.WriteLine(); }
    }
     B : IMyInterface
    {
          MethodB() { Console.WriteLine(); }
          MethodA( i) { Console.WriteLine(); }
    }
     C : IMyInterface
    {
          MethodB() { Console.WriteLine(); }
          MethodA( obj)
        {
            Console.WriteLine();
        }
    }
     ExtMethodDemo
    {
          Main([] args)
        {
            A a =  A();
            B b =  B();
            C c =  C();
            a.MethodA(1);           
            a.MethodA();     
            a.MethodB();            
            b.MethodA(1);           
            b.MethodB();            
            b.MethodA();     
            c.MethodA(1);           
            c.MethodA();     
            c.MethodB();            
        }
    }
}