wcf - 如何在 wcf rest 服务中添加全局错误处理

Question

在我的网络应用程序中，我使用 global.asax 中的 Application_Error 函数来记录所有异常，如下所示:

void Application_Error(object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();

    while (ex.GetBaseException() != null)
    {
        ex = ex.GetBaseException();
    }

    log.writeError(ex.ToString());
}

我在 WCF REST 服务中尝试过类似的方法，但没有成功。我将如何添加全局错误处理？我看到了this article ，但我是 IServiceBehavior 的新手。我应该在哪里添加上面的代码？

Answer 1

我使用:

1) AppDomain.CurrentDomain.UnhandledException 事件

2) TaskScheduler.UnobservedTaskException 事件

3) IErrorHandler:

    public class ErrorHandler : IErrorHandler
    {
        public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
        {
            var faultException = new FaultException<string>("Server error: " + error.Format());
            var messageFault = faultException.CreateMessageFault();
            fault = Message.CreateMessage(version, messageFault, null);
        }

        public bool HandleError(Exception error)
        {
            return false;
            //return true; //if handled
        }
    }

[AttributeUsage(AttributeTargets.Class)]
public class ErrorHandlerBehavior : Attribute, IEndpointBehavior, IServiceBehavior
{
    public void Validate(ServiceEndpoint endpoint)
    {

    }

    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {

    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
    {
        endpointDispatcher.ChannelDispatcher.ErrorHandlers.Add(new ErrorHandler()); 
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {

    }

    public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {

    }

    public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {

    }

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

这可以应用于整个服务实现。类:

[ErrorHandlerBehavior]
    public class SubscriberInfoTaskService : {}

或端点:

var endpoint = Host.Description.Endpoints.FirstOrDefault();

//foreach (ChannelDispatcher channelDispatcher in Host.ChannelDispatchers) //ChannelDispatcherBase
//{                 
//    channelDispatcher.ErrorHandlers.Add(new ErrorHandler());
//}

endpoint.Behaviors.Add(new ErrorHandlerBehavior());

这里是关于使用配置的:http://www.steverb.com/post/2008/11/24/Useful-WCF-Behaviors-IErrorHandler.aspx