C#生成不重复随机数的两个函数

using System;   
using System.Collections.Generic;   
using System.Text;   
using System.Collections;   
  
namespace 生成N个不重复随机数的两个函数   
{   
    class Program   
    {   
        static void Main(string[] args)   
        {   
            DateTime d1 = System.DateTime.Now;   
            int[] list1 = GetRandom1(1, 100000, 5000);   
            TimeSpan dd1 = System.DateTime.Now - d1;   
  
            DateTime d2 = System.DateTime.Now;   
            int[] list2 = GetRandom2(1, 100000*100, 5000);   
            TimeSpan dd2 = System.DateTime.Now - d2;   
  
            //foreach (int i in list1)   
            //    Console.Write("{0},", i);   
            //foreach (int ii in list2)   
            //    Console.Write("{0},", ii);   
  
            Console.WriteLine("第一种方法，1-100000    里取5000个用时：{0}", dd1.TotalMilliseconds);   
            Console.WriteLine("第二种方法，1-100000*100里取5000个用时：{0}", dd2.TotalMilliseconds);   
  
            Console.WriteLine("判断第二种方法里是否有重复数，如果是5000就是没有重复的：{0}",RemoveDup(list2).Length);   
            Console.ReadKey();   
  
        }   
  
        public static int[] RemoveDup(int[] myData)   
        {   
            if (myData.Length > 0)   
            {   
                Array.Sort(myData);   
                int size = 1;   
                for (int i = 1; i < myData.Length; i++)   
                    if (myData[i] != myData[i - 1])   
                        size++;   
                int[] myTempData = new int[size];   
                int j = 0;   
                myTempData[j++] = myData[0];   
                for (int i = 1; i < myData.Length; i++)   
                    if (myData[i] != myData[i - 1])   
                        myTempData[j++] = myData[i];   
                return myTempData;   
            }   
            return myData;   
        }     
  
  
        //方法1   
        public static int[] GetRandom1(int minValue, int maxValue, int count)   
        {   
  
            Random rnd = new Random();   
            int length = maxValue - minValue + 1;   
            byte[] keys = new byte[length];   
            rnd.NextBytes(keys);   
            int[] items = new int[length];   
            for (int i = 0; i < length; i++)   
            {   
                items[i] = i + minValue;   
            }   
            Array.Sort(keys, items);   
            int[] result = new int[count];   
            Array.Copy(items, result, count);   
            return result;   
  
        }   
  
        //方法2   
        public static int[] GetRandom2(int minValue, int maxValue, int count)   
        {   
            int[] intList = new int[maxValue];   
            for (int i = 0; i < maxValue; i++)   
            {   
                intList[i] = i + minValue;   
            }   
            int[] intRet = new int[count];   
            int n = maxValue;   
            Random rand = new Random();   
            for (int i = 0; i < count; i++)   
            {   
                int index = rand.Next(0, n);   
                intRet[i] = intList[index];   
                intList[index] = intList[--n];   
            }   
  
            return intRet;   
        }   
  
    }   
}