UserModel 略

List<UserModels> lstUser = new List<UserModels>{...}

Coyp:

　　var lstUserCopy = new List<UserModels>(lstUser.ToArray());

Test1:

　　lstUserCoyp.Add(new UserModels{...}); 

　　lstUser.length + 1 = lstUserCoyp.length       OK!

Test2:

　　lstUserCoyp[0].Birthday = DateTime.Parse("2014/12/31");

　　lstUser[0] 发成变化。   ERROR！

C# List Copy