Snippets for 2010 blog post "WCF - Global Exception Handling"

WCFEH_1.cs

using System;  
using System.ServiceModel.Channels;  
using System.ServiceModel.Description;  
using System.ServiceModel.Dispatcher;  
using Castle.Core.Logging;

/// <summary>
/// Being a custom EndpointBehavior added to the WCF services to provide custom error handling functionality.
/// Namely, logging error so it doesn't get ignored.
/// </summary>
public class ErrorHandlerBehavior : IEndpointBehavior, IErrorHandler  
{
    /// <summary>
    /// Backing store for <paramref name="Logger"/>.
    /// </summary>
    /// <remarks>Defaults to a NullLogger, so that this component can safely be used even if logging has not been configured.</remarks>
    private ILogger logger = NullLogger.Instance;

    /// <summary>
    /// Gets or sets a component for providing logging functionality.
    /// </summary>
    public ILogger Logger
    {
        get { return this.logger; }
        set { this.logger = value; }
    }

    /// <summary>
    /// Handles an exception.
    /// </summary>
    /// <param name="error">Exception to be handled</param>
    /// <returns>Indication of whether it is safe for WCF to continue using state associated with the failed request.</returns>
    public bool HandleError(Exception error)
    {
        // Just log the error, umkay?
        this.Logger.Error("Unhandled exception occurred", error);
        return true;
    }

    public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
    {
    }

    public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
    }

    public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
    {
        // Add ourself to the collection of error handlers.
        endpointDispatcher.ChannelDispatcher.ErrorHandlers.Add(this);
    }

    public void Validate(ServiceEndpoint endpoint)
    {
    }
}

WCFEH_2.cs

container.Register(  
    Component.For<ErrorHandlerBehavior>()
        .Attribute("scope").Eq(WcfExtensionScope.Services));