我好像遇到了一个问题,无法让IErrorHandler
接口正常工作。我的代码如下:
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Configuration;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;
namespace WcfService3
{
public class Service1 : IService1
{
public string GetData(int value)
{
throw new Exception("asdf");
}
}
public class MyErrorHandler : IErrorHandler
{
public MyErrorHandler()
{
string Hello = "";
}
public bool HandleError(Exception error)
{
return true;
}
public void ProvideFault(Exception error, MessageVersion version, ref Message msg)
{
var vfc = new MyFault();
var fe = new FaultException<MyFault>(vfc);
var fault = fe.CreateMessageFault();
msg = Message.CreateMessage(version, fault, "http://ns");
}
}
public class ErrorHandlerExtension : BehaviorExtensionElement, IServiceBehavior
{
public override Type BehaviorType
{
get { return GetType(); }
}
protected override object CreateBehavior()
{
return this;
}
private IErrorHandler GetInstance()
{
return new MyErrorHandler();
}
void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
{
}
void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
IErrorHandler errorHandlerInstance = GetInstance();
foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
{
dispatcher.ErrorHandlers.Add(errorHandlerInstance);
}
}
void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
foreach (ServiceEndpoint endpoint in serviceDescription.Endpoints)
{
if (endpoint.Contract.Name.Equals("IMetadataExchange") &&
endpoint.Contract.Namespace.Equals("http://schemas.microsoft.com/2006/04/mex"))
continue;
foreach (OperationDescription description in endpoint.Contract.Operations)
{
if (description.Faults.Count == 0)
{
throw new InvalidOperationException("FaultContractAttribute not found on this method");
}
}
}
}
}
}
我的web.config文件如下:
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5"/>
</system.web>
<system.serviceModel>
<services>
<service name="WcfService3.Service1">
<endpoint address=""
binding="basicHttpBinding"
contract="WcfService3.IService1" />
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the values below to false before deployment -->
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<extensions>
<behaviorExtensions>
<add name="errorHandler"
type="WcfService3.ErrorHandlerExtension, WcfService3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</behaviorExtensions>
</extensions>
<protocolMapping>
<add binding="basicHttpsBinding" scheme="https" />
</protocolMapping>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
<!--
To browse web app root directory during debugging, set the value below to true.
Set to false before deployment to avoid disclosing web app folder information.
-->
<directoryBrowse enabled="true"/>
</system.webServer>
</configuration>
我的 WCF 接口是:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WcfService3
{
[ServiceContract]
public interface IService1
{
[OperationContract]
[FaultContract(typeof(MyFault))]
string GetData(int value);
}
[DataContract]
public class MyFault
{
}
}
我的问题与WCF中的IErrorHandler有关,如果在WCF服务调用期间出现任何异常,则应先调用HandlerError()
函数,就像C# Windows应用程序中的UnhandledException类一样,然后服务应该崩溃对吧? 在上面的代码中,在服务调用期间抛出异常,但是我的HandlerError
函数在异常抛出之前没有被调用? 我的目标是记录错误,WCF服务可以抛出未处理的异常并崩溃。在调试期间,我期望断点会访问HandleError函数,但是该函数没有被调用,只是显示了一个异常?