EasyUI ComboTree 递归绑定详解

 <input id="Series" name="Series" class="easyui-combotree"  method=‘get‘/> 

<%@ WebHandler Language="C#" Class="ProductClassify" %>

using System;
using System.Web;
using System.Data;
using System.Text;
using System.Web.Script.Serialization;

public class ProductClassify : IHttpHandler {
    HttpContext Context = null;
    JiaSoft.BLL.Classify_BLL PClassiyList = new JiaSoft.BLL.Classify_BLL();
    public void ProcessRequest (HttpContext context) {
        Context = context;
        string action = context.Request["action"].ToString();
        responseAction(action);
    }
    private void responseAction(string action)
    {
       if (action.Equals("MList"))  //获得多级列表
        {
            InitComboTree(Context, PClassiyList);
                     
        }
    }
    //初始化ComboTree数据
    public void InitComboTree(HttpContext context, JiaSoft.BLL.Classify_BLL PClassiyList)
    {
            DataTable dt;
            System.Text.StringBuilder sb = new System.Text.StringBuilder(); 
　　　　　　　//数据库设计名称、id、父类id 初始化先获取父类id=0的数据集，返回数据是DataTable类型          
            dt = PClassiyList.GetList("  Mtype=102 and ParentID=0 ").Tables[0];
            string sbs =string.Empty;
            if (dt == null)
            {
                sbs= "[]";
            }
            StringBuilder builder = new StringBuilder();
            builder.Append("[");
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    builder.Append("{");

                    builder.Append("\"id\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["ClassifyID"].ToString()));
                    builder.Append(",");
                    builder.Append("\"text\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["CodeName"].ToString()));
                    builder.Append(",");
　　　　　　　　　　　　//调用递归方法
                    builder = InitChild(builder, dt.Rows[i]["ClassifyID"].ToString(), PClassiyList);
                    builder.Append("}");
                    if (i < (dt.Rows.Count - 1))
                    {
                        builder.Append(",");
                    }
                }
            }
            builder.Append("]");
            sbs = builder.ToString();
            Context.Response.Write(sbs);   
    }
    //递归子类
    public StringBuilder InitChild(StringBuilder builder, string parentID, JiaSoft.BLL.Classify_BLL PClassiyList)
    {
        DataTable dt = PClassiyList.GetList("  Mtype=102 and ParentID=" + parentID ).Tables[0];
        if (dt == null)
        {
            builder.Append("");
        }
        builder.Append("\"children\":[");
        if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                builder.Append("{");

                builder.Append("\"id\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["ClassifyID"].ToString()));
                builder.Append(",");
                builder.Append("\"text\":" + new JavaScriptSerializer().Serialize(dt.Rows[i]["CodeName"].ToString()));
                builder.Append(",");
                builder = InitChild(builder, dt.Rows[i]["ClassifyID"].ToString(), PClassiyList);
                builder.Append("}");
                if (i < (dt.Rows.Count - 1))
                {
                    builder.Append(",");
                }
            }
        }
        builder.Append("]");
        return builder;
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}

效果图：