C# 生成不相同的随机数

  public List<int> GenerateNumber(int allNum)
    {
        Random random = new Random();
        List<int> number = new List<int>(allNum);
        List<int> result = new List<int>(allNum);
        for (int i = 0; i < allNum; i++)
        {
            number.Add(i);
        }
        for (int i = 0; i < allNum; i++)
        {
            int tempNum = random.Next(0, number.Count);
            result.Add(number[tempNum]);
            number.RemoveAt(tempNum);
        }
        return result;
    }