c#中产生不重复的随机数

///
/// 产生一组不重复的随机数
///
public static int[] SuiJiSuZu(int MinValue,int MaxValue,int Length)
{
if (MaxValue - MinValue + 1 < Length)
{
return null;
}
Random R = new Random();
Int32 SuiJi = 0;
Int32 suijisuzu = new Int32[Length];
int min = MinValue - 1;
int max = MaxValue + 1;
for (int i = 0; i < Length; i++)
{
suijisuzu[i] = min;
}
for (int i = 0; i < Length; i++)
{
while (true)
{
SuiJi = R.Next(max);
if (Array.IndexOf(suijisuzu,SuiJi) == -1)
{
suijisuzu[i] = SuiJi;
break;
}
}
}
return suijisuzu;
}