[WCF]Web客户端调用WCF服务后,回调返回结果不显示,请大家帮帮忙解决方案 _Web Service

[WCF]Web客户端调用WCF服务后,回调返回结果不显示,请大家帮帮忙
大家好

我下载了微软的一个WCF示例,它用IIS承载WCF服务,采用双工回调技术,示例中客户端采用控制台应用程序.

我把客户端改成WebForm应用程序后,回调结果显示不出来,但是在调试的时候有时可以得到和显示正确结果.

下面我把Web客户端的前后台代码贴出来,另外提供整个源码下载.
http://www.zhstrong.com/uploadfiles/cs.rar

HTML code


<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<!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></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
        <asp:TextBox ID="TextBox1" runat="server" Height="345px" TextMode="MultiLine"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Button" />
        <asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Button" />
        <asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="Button" />
        </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    
    </form>
</body>
</html>

C# code


using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ServiceModel;

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page,WebClientTest.ICalculatorDuplexCallback
    {
        //WebClientTest为引用的WCF服务命名空间
        WebClientTest.CalculatorDuplexClient client;
        double value;
        protected void Page_Load(object sender, EventArgs e)
        {
            InstanceContext instanceContext = new InstanceContext(this);
            //每次执行Button事件,client都为空.
            // Create a client
            if (client == null)
            {
                //创建WCF服务的客户端
                client = new WebClientTest.CalculatorDuplexClient(instanceContext);
            }          
        }

        #region ICalculatorDuplexCallback 成员
        /// <summary>
        /// 实现回调成员
        /// </summary>
        /// <param name="result1"></param>
        public void Result(double result1)
        {
            this.TextBox1.Text += result1.ToString() + "\r\n";
            
        }

        public void Equation(string eqn)
        {
            this.TextBox1.Text += eqn + "\r\n";
        }

        #endregion

        protected void Button1_Click(object sender, EventArgs e)
        {
            // Call the AddTo service operation.
            //调用WCF服务
            value = 100.00D;
            client.AddTo(value);
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            // Call the SubtractFrom service operation.
            value = 50.00D;
            client.SubtractFrom(value);
        }

        protected void Button3_Click(object sender, EventArgs e)
        {
            // Call the MultiplyBy service operation.
            value = 17.65D;
            client.MultiplyBy(value);
        }

        protected void Button4_Click(object sender, EventArgs e)
        {
            // Call the DivideBy service operation.
            value = 2.00D;
            client.DivideBy(value);
        }
    }
}