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ExceptionHandler Class

Extend the ExceptionHandler class to create an exception handler for unhandled exceptions that occur within the Windows Communication Foundation (WCF) runtime.

Namespace:  System.ServiceModel.Dispatcher
Assembly:  System.ServiceModel (in System.ServiceModel.dll)

Public MustInherit Class ExceptionHandler
Dim instance As ExceptionHandler

Extend the ExceptionHandler class and override the HandleException method to determine whether an exception should terminate the application. Then create a new instance of your custom ExceptionHandler class and assign it to the static AsynchronousThreadExceptionHandler or TransportExceptionHandler property prior to creating WCF clients or services.

The following code example shows an implementation of the ExceptionHandler abstract class that overrides the HandleException method.

using System;
using System.ServiceModel.Dispatcher; // ExceptionHandler 

namespace CS
    public class MyExceptionHandler: ExceptionHandler
            // HandleException method override gives control to  
            // your code. 
            public override bool HandleException ( Exception ex )
                // This method contains logic to decide whether  
                // the exception is serious enough 
                // to terminate the process. 
                return ShouldTerminateProcess (ex);

            public bool ShouldTerminateProcess (Exception ex)
                // Write your logic here. 
                return   true;

The following code example shows how to enable the custom MyExceptionHandler for unhandled exceptions that occur within the WCF runtime.

    static void Main(string[] args)
        // Create an instance of the MyExceptionHander class.
        MyExceptionHandler thisExceptionHandler =
            new MyExceptionHandler();

        // Enable the custom handler by setting  
        //   AsynchronousThreadExceptionHandler property 
        //   to this object.
        ExceptionHandler.AsynchronousThreadExceptionHandler = 

        // After the handler is set, write your call to  
        // System.ServiceModel.ICommunication.Open here


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0