List<int> num = new List<int>() { 2, 9, 9, 2, 3, 9 };

num.distinct();

foreach (int item in num)
                {
                    for (int i = 0; i < num.Distinct().Count(); i++)
                    {
                        if (f.List.Cell(1, 1).Text.Length < sj.Distinct().Count())
                        {
                            f.List.Cell(1, 1).Text = f.List.Cell(1, 1).Text + sj[i].ToString();
                        }
                    }
                }

f.List.Cell(1, 1).Text = string.Join("", num.Distinct().ToArray());

------解决方案--------------------
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引用:
C# code
List<int> num = new List<int>() { 2, 9, 9, 2, 3, 9 };

num.distinct();

foreach (int item in num)
{
for (int i = 0; i < num.Distinct().Count(); i++)
……

NET  哪个版本？？？Dist……