Catch and Handle WCF Service Exceptions in Silverlight

using System.ServiceModel;
using System.ServiceModel.Channels;
using WCFHelpers.Client;

namespace WCFHelpers
{
    public static class Global
    {
        public enum FaultHandling
        {
            /// <summary>
            /// The client cannot handle faults Fault handling 
            /// </summary>
            None,
            Simple,
            FullContract,
        }

        public const string FaultHandlingNS = "urn:Silverlight-FaultHandler";

        /// <summary>
        /// Adds a message header to the current operation stating that the client does not support standard Fault contracting
        /// </summary>
        /// <param name="Context">The active <see cref="OperationContext"/></param>
        public static void SetNoFaultHandling(OperationContext Context)
        {
            //Remove any previous Header
            int iHeader = Context.OutgoingMessageHeaders.FindHeader("NoFaultHandling", FaultHandlingNS);
            if (iHeader >= 0)
                Context.OutgoingMessageHeaders.RemoveAt(iHeader);

            Context.OutgoingMessageHeaders.Add(MessageHeader.CreateHeader("NoFaultHandling", FaultHandlingNS, true));

        }

        /// <summary>
        /// Checks the current operation for a message header stating if it can handle standard fault contracts
        /// </summary>
        /// <param name="Context">The active <see cref="OperationContext"/></param>
        /// <returns>false if the current operation has explicitly stated it cannot handle faults, true otherwise</returns>
        public static bool HandlesFaults(OperationContext Context)
        {
            int iHeader = Context.IncomingMessageHeaders.FindHeader("NoFaultHandling", FaultHandlingNS);
            if (iHeader < 0)
                return true;
            return !Context.IncomingMessageHeaders.GetHeader<bool>(iHeader);
        }

        /// <summary>
        /// Adds <see cref="FaultDetail"/> to the current Outgoing message headers
        /// </summary>
        /// <param name="Fault">The <see cref="FaultDetail"/> to add to the message</param>
        /// <param name="Context">the active <see cref="OperationContext"/></param>
        public static void SetFault(FaultDetail Fault, OperationContext Context)
        {
            Context.OutgoingMessageHeaders.Add(MessageHeader.CreateHeader("Fault", FaultHandlingNS, Fault));
        }
        /// <summary>
        /// Extracts and returns a <see cref="FaultDetail"/> object from the message headers if present
        /// </summary>
        /// <param name="Context">The active <see cref="OperationContext"/></param>
        /// <returns>A <see cref="FaultDetail"/> if it was present in the returning message</returns>
        public static FaultDetail GetFault(OperationContext Context)
        {
            int iHeader = Context.IncomingMessageHeaders.FindHeader("Fault", FaultHandlingNS);
            if (iHeader >= 0)
                return Context.IncomingMessageHeaders.GetHeader<FaultDetail>(iHeader);
            return null;
        }
        
    }
}