C# 生成随机索引列表

/// <summary>
/// 生成随机索引列表
/// </summary>
/// <param name="maxNumber"></param>
/// <returns></returns>
private static List<int> CreateRandomNumbers(int maxNumber)
{
var array = new int[maxNumber];
for (var i = 0; i < maxNumber; i++)
{
array[i] = i;
}
var rnd = new Random();
for (var i = 0; i < maxNumber; i++)
{
var index = rnd.Next(0, maxNumber);
if (i != index)
{
var tmpval = array[i];
array[i] = array[index];
array[index] = tmpval;
}
}
var list = new List<int>();
for (var i = 0; i < maxNumber; i++)
{
list.Add(array[i]);
}
return list;
}

/// <summary>
/// 生成随机索引列表
/// </summary>
/// <param name="maxNumber"></param>
/// <returns></returns>
private static List<int> CreateRandomNumbers2(int maxNumber)
{
List<int> list = new List<int>();
Random rd = new Random();
while (list.Count() < maxNumber)
{
int i = rd.Next(0, maxNumber);
if (!list.Contains(i))
{
list.Add(i);
}
}
return list;
}

/// <summary>
/// 生成随机索引列表
/// </summary>
/// <param name="maxNumber"></param>
/// <returns></returns>
private static List<int> CreateRandomNumbers2(int maxNumber)
{
var array = new int[maxNumber, 2];
var index = maxNumber - 1;
var rnd = new Random();
while (index > 0)
{
array[index, 0] = index;
array[index, 1] = rnd.Next(0, maxNumber);
index--;
}
var list = new List<int>();
for (var i = 0; i < maxNumber; i++)
{
for (var j = i + 1; j < maxNumber; j++)
{
if (array[i, 1] > array[j, 1])
{
var tIndex = array[i, 0];
var tValue = array[i, 1];

array[i, 0] = array[j, 0];
array[i, 1] = array[j, 1];

array[j, 0] = tIndex;
array[j, 1] = tValue;
}
}
}
for (var i = 0; i < maxNumber; i++)
{
list.Add(array[i, 0]);
}
return list;
}