C# winfrom 随机生成5个在0 到50直接的随机数，切不重复，怎么实现啊

Question

C# winfrom 随机生成5个在0 到50之间的随机数，且不重复，怎么实现啊

Answer 1

   主要函数： 
public List<int> getnum()
        {
            Random r = new Random();
            List<int> result = new List<int>();
            int a;
            for (int i = 0; i < 5; i++)     //获得5个随机数
            {
                a = r.Next(0, 50);  //设置范围0~50
                if (i == 0)
                {
                    result.Add(a);
                }
                else
                {
                    if (result.IndexOf(a) > 0)
                    {
                        i = i - 1; //有重复值,重新再来一次
                    }
                    else
                    {
                        result.Add(a);  //无重复值，+1
                    }
                }
            }
            return result;
        }

Answer 2

Random r = new Random();
Dictionary<int, int> dic = new Dictionary<int, int>();
while (dic.Count + 1 < 6)
{
int tmp = r.Next(0, 50);
if (!dic.ContainsKey(tmp))
dic.Add(tmp, 0);
}
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Answer 3

            Random r = new Random();
            Dictionary<int, byte> dic = new Dictionary<int, byte>();
            while (dic.Count + 1 < 5) 
            {
                int tmp = r.Next(0, 50);
                if (!dic.ContainsKey(tmp))
                    dic.Add(tmp, 0);
            }

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