泛型类和扩展方法

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 泛型类扩展方法{ class Holder<T> { T[] vars = new T[3]; public Holder(T v0,T v1,T v2) { vars[0] = v0; vars[1] = v1; vars[2] = v2; } public T[] GetValues() { return vars; } } /*扩展方法的要求： *1、声明为static *2、是静态类的成员 *3、第一个参数类型中必须有关键词this,后面是扩展的泛型类的名字 */ static class ExtendHolder { public static void Print<T>(this Holder<T> h) { T[] vlas = h.GetValues(); Console.WriteLine("{0},\t{1},\t{2}",vlas[0],vlas[1],vlas[2]); } } class Program { static void Main(string[] args) { var intHolder = new Holder<int>(3, 5, 7); var stringHolder = new Holder<string>("asd","dfew","vrfa"); intHolder.Print(); stringHolder.Print(); Console.ReadKey(); } }}