简单Ajax.net小问题，前台JS如何调用后台代码

/*--相當于GridViewBind()-------------------------------------------------------------------------------------------*/ 

    function Search(pagesize,pageCurrentCount)

    {

        var UserName=$get("optSelectUserName").value;

        var Project=$get("optSelectProject").value;

        GetData(pagesize,pageCurrentCount,UserName,Project);

        return false;

    }



    function GetData(pagesize,pageCurrentCount,userName, project)

    {

        $get("displayImage").style.display="block";

        var UserName=userName;

        var Project=project;

        WebService_AJAXGridView.GetData(pagesize,pageCurrentCount,UserName, Project, SucceededCallback, FailedCallback,"XmlDocument");

    }

    

    function SucceededCallback(result, userContext, methodName)

    {

        if (userContext == "XmlDocument")

	    {

   	        UpdateTable(result);

	    }

        $get("displayImage").style.display="none";

        //document.getElementById("lab_TotalPage").innerText=

    }



    function FailedCallback(error)

    {

        // Display the error.    

        var stackTrace=error.get_stackTrace();

        var message= error.get_message();

        var statusCode=error.get_statusCode();

        var exceptionType=error.get_exceptionType();

        var timeout=error.get_timedOut();

        

        var errstr="推疊追蹤: "+ stackTrace+"\n";

        errstr+="服務錯誤:"+ message+"\n";

        errstr+="狀態碼:"+ statusCode+"\n";

        errstr+="例外類型:"+ exceptionType+"\n";

        errstr+="逾時:"+ timeout+"\n";

        errstr+="請關掉IE, 重新進入 !!";

        alert(errstr);



        $get("displayImage").style.display="none";

    }

/*--相當于GridViewBind()-------------------------------------------------------------------------------------------*/     

//WebService



using System;

using System.Data;

using System.Xml;

using System.Text;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Web.Script.Services;

using System.Web.Script.Serialization;

using System.Web.Security;

using System.Xml.Linq;

using System.Data.Sql;

using System.Data.SqlClient;







/// <summary>

/// WebService_AJAXGridView 的摘要描述

/// </summary>

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

// 若要允許使用 ASP.NET AJAX 從指令碼呼叫此 Web 服務，請取消註解下一行。

 [System.Web.Script.Services.ScriptService]

public class WebService_AJAXGridView : System.Web.Services.WebService {



    public WebService_AJAXGridView () {



        //如果使用設計的元件，請取消註解下行程式碼 

        //InitializeComponent(); 

    }



    //Create By Takako_Yang,at 2008/12/04

    [WebMethod(Description = "My AJAX Gridview Data Select", EnableSession = true)]

    [ScriptMethod(ResponseFormat = ResponseFormat.Xml)]

    public XmlDocument GetData(int pagesize,int pageCurrentCount,string userName, string project)

    {

        DailyWorkFactory myDailyWorkFactory = new DailyWorkFactory();

        DataTable dt = myDailyWorkFactory.GetDailyWork(0, 1,pagesize,pageCurrentCount, userName, project, "");//flag1用來判斷Select來源自現有的，還是編輯時Create的新的

        StringBuilder sb = new StringBuilder();

        sb.Append("<AJAXSet>");

        //select [No],Project,Item,Code,[Description (purpose/value)],

        //Status,[%],[Start Date],[Due Date],Owner,[Day/Hour] from daily_work

        foreach (DataRow myDataRow in dt.Rows)

        {

            string No = myDataRow[0].ToString();

            string Project1 = myDataRow[1].ToString();

            string Item = myDataRow[2].ToString();

            string Code = myDataRow[3].ToString();

            string Desciption = myDataRow[4].ToString();

            string Status = myDataRow[5].ToString();

            string Percent = myDataRow[6].ToString();

            string StartDate = (Convert.ToDateTime(myDataRow[7])).ToString("yyyy/MM/dd");

            string DueDate = (Convert.ToDateTime(myDataRow[8])).ToString("yyyy/MM/dd");

            string Owner = myDataRow[9].ToString();

            string NeedTime = myDataRow[10].ToString();

            sb.Append("<AJAXData>");

            sb.Append("<P1>").Append(No).Append("</P1>");

            sb.Append("<P2>").Append(Project1).Append("</P2>");

            sb.Append("<P3>").Append(Item).Append("</P3>");

            sb.Append("<P4>").Append(Code).Append("</P4>");

            sb.Append("<P5>").Append(Desciption).Append("</P5>");

            sb.Append("<P6>").Append(Status).Append("</P6>");

            sb.Append("<P7>").Append(Percent).Append("</P7>");

            sb.Append("<P8>").Append(StartDate).Append("</P8>");

            sb.Append("<P9>").Append(DueDate).Append("</P9>");

            sb.Append("<P10>").Append(Owner).Append("</P10>");

            sb.Append("<P11>").Append(NeedTime).Append("</P11>");

            sb.Append("</AJAXData>");

        }

        sb.Append("</AJAXSet>");

        XmlDocument xmlDoc = new XmlDocument();

        xmlDoc.LoadXml(sb.ToString());

        return xmlDoc;

    }

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="JavaScript get Net Function.aspx.cs" Inherits="JavaScript_get_Net_Function" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>前臺與后臺方法護調總結</title>

    <%--

        JavaScript異步調用定義在ASP.Net頁面中的方法, 我們需要:

            1.將該方法聲明為公有(public);

            2.將該方法聲明為類方法(C#中的static,VB.NET中的Shared),而不是實例方法;

            3.將該方法添加【WebMethod】屬性

            4.將頁面中ScriptManager控件的EnablePageMethods屬性設置為true;

            5.在客戶端使用如下JavaScript語法調用該頁面方法

                PageMethods.[MethodName](param1,param2,...,callbackFunction);

            6.為客戶端異步調用指定回調函數,在回調函數中接受返回值并進一步處理;

            7.添加 using System.Web.Services;

    --%>

    

    <%--

        ASP.Net后臺調用JavaScript function的方法,我們要注意:

            1.盡量少用Response.Write(<script></script>);這種方法,它會影響CSS導致頁面效果偏差

            2.C#中使用ScriptManager.RegisterStartupScript(this, this.GetType(), "edit", "JS('"+param1+"','"+param2+"')", true);

            3.添加 using System.Web.UI;

    --%>

   

    <script type="text/javascript">

   

/*-------------JavaScript調用.Net后臺Start----------------------------------*/

        function JsCallCSharp(param1)

        {

            PageMethods.SayHelloFromPage(param1,onSayHelloSucceeded);

        }

        

        function onSayHelloSucceeded(result)

        {

            alert(result);

        }

/*-------------JavaScript調用.Net后臺End----------------------------------*/

        

/*-------------.Net調用JavaScript Start-----------------------------------*/

        function CSharpCallJs(param1,param2)

        {

            alert(param1 + param2);

        }

/*-------------.Net調用JavaScript Start-----------------------------------*/

    </script>

    

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:ScriptManager ID="ScriptManager1" EnablePageMethods="true" runat="server" />

    </div>

    

    <asp:Button ID="Button1" onclick="Button1_Click" OnClientClick="JsCallCSharp('takako');" runat="server" Text="Button1" />

    

    </form>

</body>

</html>

using System;

using System.Web.Services;

using System.Web.UI;



public partial class JavaScript_get_Net_Function : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {



    }



    protected void Button1_Click(object sender, EventArgs e)

    {

        string param1 = "你好:";

        string param2 = "takako_mu";

        ScriptManager.RegisterStartupScript(this, this.GetType(), "edit", "CSharpCallJs('" + param1 + "','" + param2 + "');", true);

    }



    [WebMethod]

    public static string SayHelloFromPage(string name)

    {

        return string.Format("Hello {0}!", name);

    }

}