ASP.NET返回Json数据

Schedule.ashx:

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

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

public class Schedule : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "application/json;charset=utf-8";

        //JavaScriptSerializer serializer = new JavaScriptSerializer();
        DataTable dt = Utilities.GetOffSchedule(, ).Tables[];
        //string jsonStr = serializer.Serialize(list);
        context.Response.Clear();
        string jsonStr = DataTableToJson("list", dt);
        context.Response.Write(jsonStr);
        //context.Response.End();
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

    public static string DataTableToJson(string jsonName, DataTable dt)
    {
        StringBuilder Json = new StringBuilder();
        Json.Append("{\"" + jsonName + "\":[");
        if (dt.Rows.Count > )
        {
            for (int i = ; i < dt.Rows.Count; i++)
            {
                Json.Append("{");
                for (int j = ; j < dt.Columns.Count; j++)
                {
                    Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
                    if (j < dt.Columns.Count - )
                    {
                        Json.Append(",");
                    }
                }
                Json.Append("}");
                if (i < dt.Rows.Count - )
                {
                    Json.Append(",");
                }
            }
        }
        Json.Append("]}");
        return Json.ToString();
    }

}