WCF FaultException IErrorHandler - 沒有返回到客戶端，導致超時異常

Question

我想在使用iis和net.tcp的WCF服務中實現IErrorHandler。

我設置了在服務器中拋出DivideByZeroException的場景。 IErrorHandler按預期發射。

FaultException不返回到客戶端，我得到超時異常。我在事件日誌中也找不到任何信息/異常。

這裏是演示代碼。 http://www.fileswap.com/dl/gQFlVsZK7M/（由檔案添加的代碼都可以看到它）（請點擊下載慢圖像）

編輯1：

服務合同：

[ServiceContract] 
public interface IService1 
{ 

    [OperationContract] 
    [FaultContract(typeof(DivideByZeroException))] 
    string GetData(int value); 

    [OperationContract] 
    [FaultContract(typeof(DivideByZeroException))] 
    CompositeType GetDataUsingDataContract(CompositeType composite); 

    // TODO: Add your service operations here 
} 

服務實現：

public class Service1 : IService1 
{ 
    public string GetData(int value) 
    { 
     int i = 0; 

     //division by zero! 
     int y = 10/i; 
     return string.Format("You entered: {0}", value); 
    } 

    public CompositeType GetDataUsingDataContract(CompositeType composite) 
    { 
     if (composite == null) 
     { 
      throw new ArgumentNullException("composite"); 
     } 
     if (composite.BoolValue) 
     { 
      composite.StringValue += "Suffix"; 
     } 
     return composite; 
    } 
} 

IErrorHandler實現：

public class WcfErrorHandler : IErrorHandler 
{ 
    public void ProvideFault(Exception error, MessageVersion version, ref Message fault) 
    { 
     var v = error as DivideByZeroException; 
     if (v != null) 
      fault = Message.CreateMessage(
       version, 
       new FaultException<DivideByZeroException>(v, new FaultReason(v.Message)).CreateMessageFault(), 
       "http://the.fault.action"); 
    } 

    public bool HandleError(Exception error) 
    { 
     return true; 
    } 
} 

Answer 1

您的ServiceReference在ConsoleApplication1不更新，不包含錯誤契約屬性。當您爲服務和客戶端使用.NET時，最好在它們之間共享DataContract和ServiceContract。

對於測試，您可以在ConsoleApplication1應用程序中引用WcfService1庫。當你這樣做，請按照下列步驟：

1. 的app.config在ConsoleApplication1：

   <client> 
   
       <endpoint address="net.tcp://localhost/WcfService1/Service1.svc" 
       binding="netTcpBinding" 
       contract="WcfService1.IService1" name="NetTcpBinding_IService2"> 
       </endpoint> 
   
   </client> 
   

2. 客戶端代碼：

   try 
   { 
       var fact = new ChannelFactory<WcfService1.IService1>("NetTcpBinding_IService2"); 
       var proxy = fact.CreateChannel(); 
       var ves = proxy.GetData(1); 
       Console.WriteLine(ves); 
   
   } 
   catch (FaultException<DivideByZeroException> exp) 
   { 
       Console.WriteLine(exp.Detail); 
   } 
   

3. 服務代碼（我喜歡捕捉異常之多更接近代碼造成它儘可能，然後拋出一個具體的故障例外）：

   public string GetData(int value) 
   {    
       try 
       { 
        int i = 0; 
        int y = 10/i; 
        return string.Format("You entered: {0}", value); 
       } 
       catch (DivideByZeroException d) 
       { 
        throw new FaultException<DivideByZeroException>(d); 
       } 
   } 
   

4. 你IErrorHandler：

   public class WcfErrorHandler : IErrorHandler 
   { 
       public void ProvideFault(Exception error, MessageVersion version, ref Message fault) 
       { 
   
        if (error is FaultException) 
        { 
         //do nothing as it's already FaultException 
         //you should do a transformation only in the case it's required 
        } 
        else 
        { 
         // Generate fault message manually including the exception as the fault detail 
         MessageFault messageFault = MessageFault.CreateFault(
          new FaultCode("Sender"), 
          new FaultReason(error.Message), 
          error); 
         fault = Message.CreateMessage(version, messageFault, null); 
        } 
       } 
   
       public bool HandleError(Exception error) 
       { 
        //here you can log an exception 
        return true; 
       } 
   } 
   

附：看起來你錯誤地託管了你的服務。爲了測試它，我在ConsoleApplication1中引用了WcfService1。並確實如下：

1. 將此類行添加到應用程序中。ConsoleApplication1的配置：

   <services> 
       <service name="WcfService1.Service1" behaviorConfiguration="CalculatorServiceBehavior"> 
       <endpoint address="" binding="netTcpBinding" contract="WcfService1.IService1" /> 
       <!--<endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange" /> --> 
       <host> 
        <baseAddresses> 
        <add baseAddress="net.tcp://localhost/WcfService1/Service1.svc"/> 
        </baseAddresses> 
       </host> 
       </service> 
   </services> 
   
   <behaviors> 
       <serviceBehaviors> 
       <behavior name="CalculatorServiceBehavior"> 
        <serviceDebug includeExceptionDetailInFaults="True" /> 
        <errorHandler /> 
       </behavior> 
       </serviceBehaviors> 
   </behaviors> 
   
   <extensions> 
       <behaviorExtensions> 
       <add name="errorHandler" type="WcfService1.ErrorHandlerExtension, WcfService1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/> 
       </behaviorExtensions> 
   </extensions> 
   

2. 而且通過客戶端撥打電話到服務之前，我已經開始服務：

   private static void Main(string[] args) 
   { 
       var host = new ServiceHost(typeof(WcfService1.Service1)); 
       host.Open(); 
       ...