C#中的Where和Lambda表达式

List<string> listString = new List<string>();
listString.Add("abc");
listString.Add("456");
listString.Add("bbb");
listString.Add("iiiiiiii");

var retList = listString.Where(u => u.Length > 4);
foreach (string str in retList)
{
    Console.WriteLine("str = {0}", str);
}
List<string> listString = new List<string>(