1.List<string> 轉數組，字符串

string[] strs= list.ToArray();string s = string.Join(",", list.ToArray());//數組轉list
string[] strArr = new string[3] { "1", "2", "3" };
List<string> strList = strArr.ToList();

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2.字符串是否數字

if (int.TryParse(i, out a) == false)int num = Convert.ToInt32(str)

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