WCF wsDualHttpBinding ASP.NET客戶端回調不起作用

Question

我已經創建了一個簡單的回調服務使用wsDualHttpBinding並嘗試使用ASP.net Web應用程序調用它，但我的問題是回調事件沒有被擊中。我已經通過Console Client嘗試了它，並且它可以正常工作。請幫我解決我在做什麼錯誤。我是新來的ASP.net

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.ServiceModel; 
using System.Threading; 

[ServiceContract(CallbackContract=typeof(IClientCallback))] 
public interface ITemperature 
{ 
    [OperationContract(IsOneWay=true)] 
    void RegisterForTempDrops(); 
} 

public interface IClientCallback 
{ 
    [OperationContract] 
    bool TempUpdate(double temp); 
} 

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Reentrant)] 
public class Temperature : ITemperature 
{ 
    public void RegisterForTempDrops() 
    { 
     OperationContext ctxt = OperationContext.Current; 
     IClientCallback callBack = ctxt.GetCallbackChannel<IClientCallback>(); 
     Thread.Sleep(3000); //simulate update happens somewhere; for example monitoring a database field 
     callBack.TempUpdate(10); 
    } 

} 

App.Config中

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
    <system.serviceModel> 
    <services> 
     <service name="Temperature" behaviorConfiguration="ServiceBehavior"> 
     <host> 
      <baseAddresses> 
      <add baseAddress="http://localhost:5050/duplexservice" /> 
      </baseAddresses> 
     </host> 
     <!-- Service Endpoints --> 
     <endpoint address="http://localhost:5050/duplexservice" binding="wsDualHttpBinding" contract="ITemperature" /> 
     <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> 
     </service> 
    </services> 
    <behaviors> 
     <serviceBehaviors> 
     <behavior name="ServiceBehavior">  
      <serviceMetadata httpGetEnabled="true"/>  
      <serviceDebug includeExceptionDetailInFaults="false"/> 
     </behavior> 
     </serviceBehaviors> 
    </behaviors> 
    </system.serviceModel> 
</configuration> 

Windows窗體來運行服務。

using System.Text; 
using System.Windows.Forms; 
using System.ServiceModel; 

namespace DuplexService 
{ 
    public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
     } 

     internal static ServiceHost myServiceHost = null; 
     private void button1_Click(object sender, EventArgs e) 
     { 
      myServiceHost = new ServiceHost(typeof(Temperature)); 
      myServiceHost.Open(); 
      MessageBox.Show("Service Started!"); 
     } 

     private void button2_Click(object sender, EventArgs e) 
     { 
      if (myServiceHost.State != CommunicationState.Closed) 
      { 
       myServiceHost.Close(); 
       MessageBox.Show("Service Stopped!"); 
      } 
     } 
    } 
} 

ASP.net客戶端代碼

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

public partial class _Default : System.Web.UI.Page, ITemperatureCallback 
{ 
    static InstanceContext site = new InstanceContext(new _Default()); 
    static TemperatureClient proxy = new TemperatureClient(site); 

    public bool TempUpdate(double temp) 
    { 
     Response.Redirect("Temp dropped to {0} : " + temp); 
     return true; 
    } 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     proxy.RegisterForTempDrops(); 
    } 
} 

<?xml version="1.0"?> 
<!-- 
    For more information on how to configure your ASP.NET application, please visit 
    http://go.microsoft.com/fwlink/?LinkId=169433 
    --> 
<configuration> 
    <system.web> 
    <compilation debug="true" targetFramework="4.0"/> 
    </system.web> 
    <system.serviceModel> 
    <bindings> 
     <wsDualHttpBinding> 
     <binding name="WSDualHttpBinding_ITemperature" closeTimeout="00:01:00" 
      openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" 
      bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" 
      maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" 
      textEncoding="utf-8" useDefaultWebProxy="true"> 
      <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" 
      maxBytesPerRead="4096" maxNameTableCharCount="16384" /> 
      <reliableSession ordered="true" inactivityTimeout="00:10:00" /> 
      <security mode="Message"> 
      <message clientCredentialType="Windows" negotiateServiceCredential="true" 
       algorithmSuite="Default" /> 
      </security> 
     </binding> 
     </wsDualHttpBinding> 
    </bindings> 
    <client> 
     <endpoint address="http://localhost:5050/duplexservice" binding="wsDualHttpBinding" 
     bindingConfiguration="WSDualHttpBinding_ITemperature" contract="DuplexService.ITemperature" 
     name="WSDualHttpBinding_ITemperature"> 
     <identity> 
      <userPrincipalName value="smdunk" /> 
     </identity> 
     </endpoint> 
    </client> 
    </system.serviceModel> 
</configuration> 

Answer 1

您使用的Web.Config代碼

Response.Redirect("Temp dropped to {0} : " + temp); 

請更改爲

Response.Write("Temp dropped to {0} : " + temp);