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 = , Name = "中国" },
                new Node { ID = , Name = "北京市", ParentID =  },
                new Node { ID = , Name = "吉林省", ParentID =  },
                new Node { ID = , Name = "上海市", ParentID =  },
                new Node { ID = , Name = "海淀区", ParentID =  },
                new Node { ID = , Name = "朝阳区", ParentID =  },
                new Node { ID = , Name = "大兴区", ParentID =  },
                new Node { ID = , Name = "白山市", ParentID =  },
                new Node { ID = , Name = "长春市", ParentID =  },
                new Node { ID = , Name = "抚松县", ParentID =  },
                new Node { ID = , Name = "靖宇县", ParentID =  }
            };