我有一個(gè)List<MenuLists>public class MenuLists{    public string Name { get; set; }    public string Ico { get; set; }    public string _href { get; set; }    public List<MenuList> ChildMenu { get; set; }}　　List<MenuList> 如下　public partial class MenuList{　　public int Id { get; set; }　　public string Name { get; set; }　　public string HeaderIco { get; set; }　　public string C_href { get; set; }　　public string ParentName { get; set; }　　public string Jurisdiction { get; set; }}當(dāng)我往MenuLists里添加數(shù)據(jù)時(shí)如果我的MenuList改變，前面添加的MenuLists里的MenuList也會(huì)跟著變這個(gè)是添加完數(shù)據(jù)的MenuLists然后我執(zhí)行了MenuList.Clear()前面已經(jīng)添加到MenuLists里的MenuList的數(shù)據(jù)也跟著清空了，請(qǐng)問是什么原因？要如何讓已經(jīng)添加的不會(huì)變？