如何在未处理的错误时停止自主托管的WCF服务？ [英] How to stop self-hosted WCF service upon unhandled errors?

问题描述

我有一个自主托管的WCF服务作为Windows服务运行。对于测试，我将其作为控制台应用程序运行。

我想捕获服务中发生的所有未处理的异常并关闭主机。我想捕获在产生响应时发生的所有非FaultExceptions，也可以捕获在空闲模式中抛出的所有异常，即从一些工作线程抛出。

任何线索？ p>

App.config：

 <？xml version =1.0 encoding =utf-8？> 
< configuration> 
< system.serviceModel> 
<行为> 
< serviceBehaviors> 
< behavior name =TestServiceBahavior> 
< serviceMetadata httpGetEnabled =true/> 
< / behavior> 
< / serviceBehaviors> 
< / behavior> 
< services> 
< service behaviorConfiguration =TestServiceBahaviorname =WcfErrorHandling.TestService> 
< host> 
< baseAddresses> 
< add baseAddress =http：// localhost：8001 / TestService/> 
< / baseAddresses> 
< / host> 
< endpoint address =binding =basicHttpBinding
 bindingConfiguration =contract =WcfErrorHandling.ITestService/> 
< endpoint address =mexbinding =mexHttpBinding
 contract =IMetadataExchange/> 
< / service> 
< / services> 
< /system.serviceModel> 
< / configuration> 
  

代码：

 使用系统; 
使用System.Linq; 
使用System.ServiceModel; 
使用System.ServiceModel.Channels; 
使用System.ServiceModel.Dispatcher; 
 
命名空间WcfErrorHandling 
 {
 [ServiceContract] 
接口ITestService 
 {
 [OperationContract] 
 string SayHello（string param） ; 
 
 
 public class TestService：ITestService 
 {
 public string SayHello（string param）
 {
 if（param ==ae ）
 throw new ArgumentException（argument exception）; 
 if（param ==fe）
抛出新的FaultException（fault exception）; 
 returnhello; 
 
} 
 
 public class TestHost：ServiceHost，IErrorHandler 
 {
 public TestHost（）
：base（typeof（TestService）） 
 {
} 
 
 public void Start（）
 {
 AppDomain.CurrentDomain.UnhandledException + = 
（sender，ea）=> ; UnhandledExceptionHandler（ea.ExceptionObject为异常）; 
 
 Open（）; 
 foreach（ChannelDispatchers.OfType&ChannelDispatcher>（）中的var channelDispatcher）
 channelDispatcher.ErrorHandlers.Add（this）; 
} 
 
 public void ProvideFault（异常错误，MessageVersion版本，ref消息错误）
 {
 // do nothing 
} 
 
 public bool HandleError（异常错误）
 {
 if（！（error is FaultException））
 UnhandledExceptionHandler（error）; 
返回true; 
} 
 
 private void UnhandledExceptionHandler（Exception ex）
 {
 Close（）; 
 Environment.Exit（1）; 
} 
} 
 
 public class Program 
 {
 public static void Main（string [] args）
 {
 var testHost = new TestHost（）; 
 testHost.Start（）; 
 Console.Out.WriteLine（按任意键退出...）; 
 Console.ReadKey（）; 
 testHost.Close（）; 
} 
} 
} 
  

解决方案

有同样的问题，这解决了我：

使您的服务实现此界面：

  public class MyService：System.ServiceModel.Description.IServiceBehavior 
  

实现如下：

  public void AddBindingParameters（System.ServiceModel.Description.ServiceDescription serviceDescription，ServiceHostBase serviceHostBase，System.Collections。 ObjectModel.Collection< System.ServiceModel.Description.ServiceEndpoint>端点，System.ServiceModel.Channels.BindingParameterCollection bindingParameters）
 {
 return; 
} 
 
 public void ApplyDispatchBehavior（System.ServiceModel.Description.ServiceDescription serviceDescription，ServiceHostBase serviceHostBase）
 {
 foreach（ChannelDispatcher channel in serviceHostBase.ChannelDispatchers）{channel。 ErrorHandlers.Add（new ErrorHandler（））; 
} 
 
 public void Validate（System.ServiceModel.Description.ServiceDescription serviceDescription，ServiceHostBase serviceHostBase）
 {
 return; 
} 
  

添加这个类：

  public class ErrorHandler：IErrorHandler 
 {
 bool IErrorHandler.HandleError（异常错误）
 {return true; 
 void IErrorHandler.ProvideFault（异常错误，System.ServiceModel.Channels.MessageVersion版本，引用System.ServiceModel.Channels.Message错误）
 {return; } 
} 
  

现在在HandleError上设置一个断点，它会显示异常

I have a self-hosted WCF service that is running as a Windows Service. For the tests, I'm running it as a console application.

I'd like to catch all unhandled exceptions that happen in the service and shutdown the host. I'd like to catch all non FaultExceptions that happen when producing a response, but also all exceptions that are thrown in "idle mode" - i.e. thrown from some worker threads.

Unfortunatelly, I can't handle the exceptions neither by IErrorHandler (not called), nor by AppDomain.CurrentDomain.UnhandledException (not raised).

Any clues?

App.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="TestServiceBahavior">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service behaviorConfiguration="TestServiceBahavior" name="WcfErrorHandling.TestService">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8001/TestService" />
          </baseAddresses>
        </host>
        <endpoint address="" binding="basicHttpBinding"
          bindingConfiguration="" contract="WcfErrorHandling.ITestService" />
        <endpoint address="mex" binding="mexHttpBinding"
          contract="IMetadataExchange" />
      </service>
    </services>
  </system.serviceModel>
</configuration>

The code:

using System;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;

namespace WcfErrorHandling
{
    [ServiceContract]
    interface ITestService
    {
        [OperationContract]
        string SayHello(string param);
    }

    public class TestService : ITestService
    {
        public string SayHello(string param)
        {
            if (param == "ae")
                throw new ArgumentException("argument exception");
            if (param == "fe")
                throw new FaultException("fault exception");
            return "hello";
        }
    }

    public class TestHost : ServiceHost, IErrorHandler
    {
        public TestHost()
            : base(typeof(TestService))
        {
        }

        public void Start()
        {
            AppDomain.CurrentDomain.UnhandledException += 
                (sender, ea) => UnhandledExceptionHandler(ea.ExceptionObject as Exception);

            Open();
            foreach (var channelDispatcher in ChannelDispatchers.OfType<ChannelDispatcher>())
                channelDispatcher.ErrorHandlers.Add(this);
        }

        public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
        {
            // do nothing
        }

        public bool HandleError(Exception error)
        {
            if (!(error is FaultException))
                UnhandledExceptionHandler(error);
            return true;
        }

        private void UnhandledExceptionHandler(Exception ex)
        {
            Close();
            Environment.Exit(1);
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            var testHost = new TestHost();
            testHost.Start();
            Console.Out.WriteLine("Press any key to exit...");
            Console.ReadKey();
            testHost.Close();
        }
    }
}

解决方案

Had the same problem, this solved it for me:

Make your service implement this interface:

public class MyService : System.ServiceModel.Description.IServiceBehavior

Implement it like this:

    public void AddBindingParameters(System.ServiceModel.Description.ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<System.ServiceModel.Description.ServiceEndpoint> endpoints, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
    {
        return;
    }

    public void ApplyDispatchBehavior(System.ServiceModel.Description.ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        foreach (ChannelDispatcher channel in serviceHostBase.ChannelDispatchers) { channel.ErrorHandlers.Add(new ErrorHandler()); }
    }

    public void Validate(System.ServiceModel.Description.ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        return;
    }

And add this class:

public class ErrorHandler : IErrorHandler
{
   bool IErrorHandler.HandleError(Exception error)
    { return true; }
   void IErrorHandler.ProvideFault(Exception error, System.ServiceModel.Channels.MessageVersion version, ref System.ServiceModel.Channels.Message fault)
    { return;  }
}

Now set a breakpoint on HandleError.. it will show you the exception

这篇关于如何在未处理的错误时停止自主托管的WCF服务？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！