c# params

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每個C#函數都允許有個參數帶params關鍵字,在調用的時候可以不給他傳值,也可以給他傳值,還可以給他傳多個值,例子如下:

 

using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            Console.WriteLine(Test("Jack"));//不傳值,顯示Jack            Console.WriteLine(Test("Jack", "Hi"));//傳一個值,顯示Jack Hi            Console.WriteLine(Test("Jack", "Hi", "How are you?"));//傳多個值,顯示Jack Hi How are you?            Console.ReadKey();        }        static string Test(string name, params string[] args)        {            string msg = name;            for (int i = 0; i < args.Length; i++)                msg += " " + args[i];            return msg;        }    }}

·一個函數中只能一個參數帶params關鍵字;
·帶params關鍵字的參數必須是最後一個參數;
·帶params關鍵字的參數類型必須是一維數組;

c# params

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