函数指针和C#代理

先看一段C的面向过程的函数指针代码：

int max(int x,int y)

{

return(x>y?x:y);

}

int min(int x,int y)

{

return(x<y?x:y);

}

int sub(int x,int y)

{

return(x+y);

}

int minus(int x,int y)

{

return(x-y);

}

void test(int(*p)(int,int),

         int(*q)(int,int),

         int a,

         int b)

{

int Int1,Int2;

Int1=(*p)(a,b);

Int2=(*q)(a,b);

printf("%d,/t%d/n",Int1,Int2);

}

 

int main(int argc, _TCHAR* argv[])

{

    test(max,min,10,3);

    test(sub,minus,10,3);

    return0;

}

 

 

再看一段C#的代理代码：

using System;

using System.Collections.Generic;

using System.Text;

namespace ConsoleApplication3

{

classMathClass

{

publicstaticint max(int a, int b)

{

return (a > b ? a : b);

}

publicstaticint min(int a, int b)

{

return (a < b ? a : b);

}

publicstaticint sub(int a, int b)

{

return (a + b);

}

publicstaticint minus(int a, int b)

{

return (a - b);

}

}

classHandler

{

publicdelegateintCalculation(int a, int b);

publicstaticvoid EventHandler(Calculation c1,Calculation c2, int a, int b)

{

int x, y;

x = c1(a, b);

y = c2(a, b);

 

Console.WriteLine("{0}：{1}/n{2}：{3}",c1.Method.ToString(), x, c2.Method.ToString(),y);

}

}

classProgram

{

staticvoid Main(string[] args)

{

Handler.EventHandler(newHandler.Calculation(MathClass.max), newHandler.Calculation(MathClass.min), 10, 3);

Handler.EventHandler(newHandler.Calculation(MathClass.sub), newHandler.Calculation(MathClass.minus), 10, 3);

Console.ReadKey();

}

}

}