以下测试代码 List<List<string>> a = new List<List<string>>(); List<string> firstElement = new List<string>(); firstElement.Add("ABC"); List<string> secondElement = new List<string>(); secondElement.Add("BCD"); a.Add(firstElement); a.Add(secondElement); foreach (List<string> i in a) { foreach (string s in i) { Console.WriteLine(s); } }