ExceptionHandler.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / ServiceModel / System / ServiceModel / Dispatcher / ExceptionHandler.cs / 1 / ExceptionHandler.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.ServiceModel.Dispatcher 
{
    using System.Runtime.ConstrainedExecution; 
    using System.Diagnostics; 
    using System.ServiceModel;
    using System.ServiceModel.Diagnostics; 
using System.Security.Permissions;
    using System.Security;

    public abstract class ExceptionHandler 
    {
        static readonly ExceptionHandler alwaysHandle = new AlwaysHandleExceptionHandler(); 
 
        /// 
        ///   Critical - this delegate is called from within a ConstrainedExecutionRegion 
        ///                    must not be settable from PT code
        /// 
        [SecurityCritical]
        static ExceptionHandler asynchronousThreadExceptionHandler; 
        static ExceptionHandler transportExceptionHandler = alwaysHandle;
 
        public static ExceptionHandler AlwaysHandle 
        {
            get 
            {
                return alwaysHandle;
            }
        } 

        public static ExceptionHandler AsynchronousThreadExceptionHandler 
        { 
            /// 
            ///   Critical - access critical field 
            ///   Safe - ok for get-only access
            /// 
            [SecurityCritical, SecurityTreatAsSafe]
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] 
            get
            { 
                return asynchronousThreadExceptionHandler; 
            }
 
            /// 
            ///   Critical - sets a critical field
            ///   Safe - protected with LinkDemand
            ///  
            [SecurityCritical, SecurityTreatAsSafe]
            [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)] 
            set 
            {
                asynchronousThreadExceptionHandler = value; 
            }
        }

        public static ExceptionHandler TransportExceptionHandler 
        {
            get 
            { 
                return transportExceptionHandler;
            } 

            set
            {
                transportExceptionHandler = value; 
            }
        } 
 
        // Returns true if the exception has been handled.  If it returns false or
        // throws a different exception, the original exception will be rethrown. 
        public abstract bool HandleException(Exception exception);


        class AlwaysHandleExceptionHandler : ExceptionHandler 
        {
            ///  
            ///   RequiresReview - this function can be called from within a CER, must not call into PT code 
            /// 
            [SecurityRequiresReview] 
            public override bool HandleException(Exception exception)
            {
                return true;
            } 
        }
 
        internal static bool HandleTransportExceptionHelper(Exception exception) 
        {
            if (exception == null) 
            {
                DiagnosticUtility.DebugAssert("Null exception passed to HandleTransportExceptionHelper.");
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperInternal(false);
            } 

            ExceptionHandler handler = TransportExceptionHandler; 
            if (handler == null) 
            {
                return false; 
            }

            try
            { 
                if (!handler.HandleException(exception))
                { 
                    return false; 
                }
            } 
            catch (Exception thrownException)
            {
                if (DiagnosticUtility.IsFatal(thrownException))
                { 
                    throw;
                } 
 
                if (DiagnosticUtility.ShouldTraceError)
                { 
                    DiagnosticUtility.ExceptionUtility.TraceHandledException(thrownException, TraceEventType.Error);
                }
                return false;
            } 

            if (DiagnosticUtility.ShouldTraceError) 
            { 
                DiagnosticUtility.ExceptionUtility.TraceHandledException(exception, TraceEventType.Error);
            } 
            return true;
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ExceptionHandler.cs source code in C# .NET

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