C#產生不重複隨機數的兩個函數

using System;   using System.Collections.Generic;   using System.Text;   using System.Collections;     namespace 產生N個不重複隨機數的兩個函數   {       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("第一種方法，1-100000    裡取5000個用時：{0}", dd1.TotalMilliseconds);               Console.WriteLine("第二種方法，1-100000*100裡取5000個用時：{0}", dd2.TotalMilliseconds);                 Console.WriteLine("判斷第二種方法裡是否有重複數，如果是5000就是沒有重複的：{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;           }         }   }