实现原理代码如下(对算法稍有了解都会明白原理的:)):

using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;

namespace DataStructureConsoleApplication
{
    class GenericProgram
    {
        //exchange the variables using the generic
        static void Swap<T>(ref T val1, ref T val2)
        {
            T temp;
            temp = val1;
            val1 = val2;
            val2 = temp;
       
        }
        static void Main(string[] args)
        {
            //assign the integer variables using the generic
            int num1 = 100;
            int num2 = 200;
            Console.WriteLine("num1={0}",num1);
            Console.WriteLine("num2={0}",num2);
            Swap<int>(ref num1,ref num2);
            Console.WriteLine("num1={0}", num1);
            Console.WriteLine("num2={0}", num2);

            //assign the string variables using the generic
            string str1 = "goal";
            string str2 = "bell";
            Console.WriteLine("str1={0}" , str1);
            Console.WriteLine("str2={0}" ,str2);
            Swap<string>(ref str1,ref str2);
            Console.WriteLine("str1={0}", str1);
            Console.WriteLine("str2={0}", str2);
        

        }
    }
}

运行结果:

num1=100

num2=200

num1=200

num2=100

str1=goal

str2=bell

str1=bell

str2=goal

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