ExceptionHandler.HandleException(Exception) Method

Reference

Definition

Namespace:: System.ServiceModel.Dispatcher

Assembly:: System.ServiceModel.dll

Important

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When overridden in a derived class, returns true if the exception has been handled, or false if the exception should be rethrown and the application terminated.

public:
 abstract bool HandleException(Exception ^ exception);

public abstract bool HandleException(Exception exception);

abstract member HandleException : Exception -> bool

Public MustOverride Function HandleException (exception As Exception) As Boolean

Parameters

exception: Exception

The exception that occurred within the Windows Communication Foundation (WCF) runtime and which might terminate the application.

Returns

Boolean

true if the exception has been handled; otherwise, false.

Examples

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

using System;
using System.ServiceModel.Dispatcher;

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;
        }
    }



Imports System.ServiceModel.Dispatcher

Namespace CS
    Public Class MyExceptionHandler
        Inherits ExceptionHandler
            ' HandleException method override gives control to 
            ' your code.
            Public Overrides Function HandleException(ByVal ex As Exception) As Boolean
                ' This method contains logic to decide whether 
                ' the exception is serious enough
                ' to terminate the process.
                Return ShouldTerminateProcess (ex)
            End Function

            Public Function ShouldTerminateProcess(ByVal ex As Exception) As Boolean
                ' Write your logic here.
                Return True
            End Function
    End Class

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

// Create an instance of the MyExceptionHandler class.
MyExceptionHandler thisExceptionHandler =
    new MyExceptionHandler();

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

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

    Sub Main(ByVal args() As String)
        ' Create an instance of the MyExceptionHandler class.
        Dim thisExceptionHandler As New MyExceptionHandler()

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

        ' After the handler is set, write your call to 
        ' System.ServiceModel.ICommunication.Open here
    End Sub
End Module

Remarks

The HandleException property returns true if the exception has been handled. If it returns false or throws a different exception, the original exception is rethrown.

Applies to

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