static List<int> Given50RandomNumbers()
{
List<int> intList = new List<int>();
for(int i=1;i<=50;i++)
{
intList.Add(i);
}
if(intList.Count>0)
{
return intList;
}

return null;
}

static void Main(string[] args)
{
List<int> intList = Given50RandomNumbers();
List<int> targetList = new List<int>();
List<int> distinctList = new List<int>();
do
{
Random rnd = new Random();
int x = rnd.Next(0, 50);
if (!targetList.Contains(intList[x]))
{
targetList.Add(intList[x]);
}
}
while (targetList.Count != 50);

distinctList = targetList.Distinct<int>().ToList();
Console.WriteLine("the count of distinctList is :{0}", distinctList.Count);

foreach(var a in targetList)
{
System.Diagnostics.Debug.WriteLine(a);
Console.WriteLine(a);
}
Console.ReadLine();

}

30
21
39
7
49
17
9
27
45
37
5
23
14
32
24
42
10
2
20
38
47
25
35
3
13
4
22
40
50
18
28
15
33
43
12
48
8
36
46
1
11
29
16
26
44
31
41
19
6
34

C# 随机 抽奖 50个随机码 不重复