用友U8存货分类通过DataTable生成EasyUI Tree JSON

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

using System;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using Newtonsoft.Json;

public class InventoryClass : IHttpHandler
{
    DataTable dt = new DataTable();
    string json = string.Empty;
    public void ProcessRequest(HttpContext context)
    {
        //选取所有成品类别
        using (SqlConnection conn = new SqlConnection(DB.ConnectionStrings.U8))
        using (SqlCommand cmd = new SqlCommand("SELECT cInvCCode as id ,cInvCCode + ' ' + cInvCName as text,iInvCGrade ,bInvCEnd FROM InventoryClass WHERE cInvCCode LIKE 'A%' order by cInvCCode", conn))
        {
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            conn.Open();
            da.Fill(dt);
            //第一个成品类别是A开头，级别为1
            getJson("A%", 1);
            context.Response.Write(json.Substring(11, json.Length - 13));
        }
    }

    void getJson(string filter, int iInvCGrade)
    {
        //筛选下一级的分类
        DataView dv = new DataView(dt, @"id like '" + filter + "' and iInvCGrade = " + iInvCGrade.ToString(), "", DataViewRowState.CurrentRows);
        if (dv.Count > 0)
        {
            //添加children
            if (!string.IsNullOrEmpty(json))
            {
                json = json.TrimEnd(',').TrimEnd('}') + ","children":[";
            }
            else
            {
                json += ""children":[";
            }
            //循环每一行
            for (int i = 0; i < dv.Count; i++)
            {
                //JsonConvert用DataTable比较方便
                DataTable dt2 = dt.Clone();
                dt2.ImportRow(dv[i].Row);
                string s = JsonConvert.SerializeObject(dt2);
                json += s.Remove(0, 1).TrimEnd(']') + ",";      //移除前后的[]，并加上,
                //递归获取下级分类
                getJson(dv[i]["id"].ToString() + "%", iInvCGrade + 1);
                dt2.Clear();
            }
            //本层循环完成后去掉后面的,并加上]},
            json = json.TrimEnd(',') + "]},";
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

生成的JSON可以用于JSON树、下拉列表、网格等

生成树效果：