求小段代码

[wax1982]

求一段随机的选出数组中的几个元素的函数
谢谢，效率越高越好！

[张赐]

int[] num={1,2,3,4,5,6,7,8,9,0};
Random rd=new Random();
for (int i=0;i<rd.Next(0,10);i++)
{
this.richTextBox1.AppendText(num[i].ToString());
}

[winteryoung84]

using System;
using System.Collections;

namespace ConsoleApplication1
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
int[] arr = new int[50];
Random ran = new Random();
for (int i = 0; i<50; i++)
{
arr[i] = ran.Next(1000);
}

int[] arrNum = new int[5];

for (int i = 0; i<5; i++)
{
arrNum[i] = ran.Next(49);
}

for (int i = 0; i<5; i++)
{
Console.WriteLine("arr[{0}]: {1}", arrNum[i]+1, arr[arrNum[i]]);
}

Console.Read();
}
}
}

这段代码每次运行时的随机数都不一样