asp.net+jQuery应用JSON实现无刷新三级联动实例

LoadClass.ashx
Code

using System;
using System.Web;

using System.Text;
using System.Data;

public class LoadClass : IHttpHandler {
   
    public void ProcessRequest (HttpContext context) {
        // 数组   [{"ID":"275","Cname":"A1"},{"ID":"319","Cname":"A2"},{"ID":"322","Cname":"A3"}]
        int strId = Convert.ToInt32(context.Request["ddlId"]);              
        string strSQL = "select * from Class where parent_Ptr="   strId   " order by classOrder asc ";
        db d = new db();
        DataTable dt = d.getDT(strSQL);
        StringBuilder strClass = new StringBuilder();
        if (dt != null)
        {
            strClass.Append("[");
            for (int i = 0; i < dt.Rows.Count; i )
            {
                strClass.Append("{");
                strClass.Append("\"ID\":\""   dt.Rows[i]["id"].ToString()   "\",");
                strClass.Append("\"Cname\":\""   dt.Rows[i]["classCname"].ToString()   "\"");

                if (i != dt.Rows.Count - 1)
                {
                    strClass.Append("},");
                }
            }

        }
        strClass.Append("}");
        strClass.Append("]");     
        context.Response.ContentType = "application/json";
        context.Response.ContentEncoding = Encoding.UTF8;
        context.Response.Write(strClass.ToString());
        context.Response.End();
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

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