C#delegate委託

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類似函數，卻沒有語句體。

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication3{    class Program    {        delegate double ProcessDelegate(double param1, double param2);        //委託定義        static double Multiply(double param1,double param2)        {            return param1 * param2;        }        static double Divide(double param1, double param2)        {            return param1 / param2;        }        static void Main(string[] args)        {            ProcessDelegate process;            Console.WriteLine("Enter 2 numbers separated with a comma:");            //輸入兩個數，用逗號隔開.            string input = Console.ReadLine();            int commaPos = input.IndexOf(‘,‘);            //擷取逗號字元所在的位置            //擷取兩個數            double param1 = Convert.ToDouble(input.Substring(0, commaPos));            double param2 = Convert.ToDouble(input.Substring(commaPos + 1, input.Length - commaPos - 1));            //輸入M代表multiply , D代表divide            Console.WriteLine("Enter M to multiply or D to divide:");            input = Console.ReadLine();            if (input == "M")                process = new ProcessDelegate(Multiply);            else                process = new ProcessDelegate(Divide);            Console.WriteLine("Result: {0}.",process(param1,param2));            Console.ReadKey();        }    }}

 

C#delegate委託