asp.net 一般处理程序

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

using System;
using System.Web;

public class SetGrid : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {

        string sql = "";
        System.Data.DataTable dtTmp = null;
        string sf = "";
        string result = "";
        try
        {
            switch (context.Request["oper"])
            {
                case "Supplier"://供应商
                    sql = "select ID,abbreviation,name,linkman1,Tel,trmo,currency,cess from provider";
                    if (!string.IsNullOrEmpty(context.Request["q"]))
                    {
                        sf = context.Request["q"].ToString().Trim();
                        sql += " where abbreviation like ‘%" + sf + "%‘ or linkman1 like ‘%" + sf + "%‘ or name like ‘%" + sf + "%‘ or Tel like ‘%" + sf + "%‘";
                    }
                    dtTmp = pubCommon.GetDataTable(sql);
                    result = pubCommon.DataTableToJson(dtTmp);
                    //result = "[{\"si_name\":\"三菱\",\"si_linkman\":\"村上\",\"si_mobile\":\"12-002136\"},{\"si_name\":\"西门西\",\"si_linkman\":\"Jon\",\"si_mobile\":\"0223-26565\"}]";
                    break;
                case "PODetail":
                    sql = "select 1 as gi_id,*,12 as pi_number,12 as qty from materiel where code = ‘110010030092‘";

                    dtTmp = pubCommon.GetDataTable(sql);
                    if (dtTmp != null)
                    {
                        result = pubCommon.DataTableToJson(dtTmp);
                    }
                    break;
                case "Query":
                    sql = "select * from materiel";

                    dtTmp = pubCommon.GetDataTable(sql);
                    if (dtTmp != null)
                    {
                        result = pubCommon.DataTableToJson(dtTmp);
                    }
                    break;
            }
        }
        catch (Exception ex)
        {
        }
        context.Response.Write(result);
        context.Response.End();

    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}