ExtJs动态树(基于Asp.net)

偶尔使用,简单的记录下过程
1.下载Newtonsoft.Json.Net20.dll后,放入Asp.net项目Bin文件夹中.
   Newtonsoft.Json.Net20,是一个Object/Json转换工具,这里用来把对象转换成Json格式字符串.
2.树节点Model对象,
  public class TreeModel{
        private string _id,_parentid, _text;
        private bool _leaf;
        private List<TreeModel> _children = new List<TreeModel>();//子节点集合
      
        public string id{
            get { return _id; }
            set { _id = value;}
        }
     
        public string parentid{
            get { return _parentid; }
            set { _parentid = value; }
        }
        public string text{
            get { return _text; }
            set { _text = value; }
        }
        public bool leaf{
            get { return _leaf; }
            set { _leaf = value; }
        }
       
        public List<TreeModel> children{
            get { return _children; }
    &nb