Tree的两种存储形式

1.xml存储

2.链式结构存储

List<Node> nodes = new List<Node>()   
            {   
                new Node { ID = 1, Name = "中国" },   
                new Node { ID = 2, Name = "北京市", ParentID = 1 },   
                new Node { ID = 3, Name = "吉林省", ParentID = 1 },   
                new Node { ID = 4, Name = "上海市", ParentID = 1 },   
                new Node { ID = 5, Name = "海淀区", ParentID = 2 },   
                new Node { ID = 6, Name = "朝阳区", ParentID = 2 },   
                new Node { ID = 7, Name = "大兴区", ParentID = 2 },   
                new Node { ID = 8, Name = "白山市", ParentID = 3 },   
                new Node { ID = 9, Name = "长春市", ParentID = 3 },   
                new Node { ID = 10, Name = "抚松县", ParentID = 8 },   
                new Node { ID = 11, Name = "靖宇县", ParentID = 8 }   
            };