List<string> 转换为 string
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List<string> list = new List<string>();
list.Add("a");
list.Add("b");
list.Add("c");
string str = string.Join(" ", list.ToArray()); //用空格串联字符串
结果：a b c
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List<string> 转 List<int>
var list = (new[]{"1","2","3"}).ToList();
var newlist = list.Select<string,int>(x =>Convert.ToInt32(x));
List<int> 转 List<string>
List<int> list = new List<int>(new int[] { 1,2,3 } );
List<string> newList = list.ConvertAll<string>(x => x.ToString());
