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exceptionswallowedoncallfromcom-mda.md

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title description ms.date helpviewer_keywords ms.assetid
exceptionSwallowedOnCallFromCom MDA
Review the exceptionSwallowedOnCallFromCOM managed debugging assistant in .NET. This MDA occurs if an exception was thrown but there's no good way to report it.
03/30/2017
messages, informational
informational messages
managed debugging assistants (MDAs), exceptions
exception handling, managed debugging assistants
MDAs (managed debugging assistants), exceptions
ExceptionSwallowedOnCallFromCOM MDA
55d6ab12-f251-4aab-aa64-aacbe9d9f974

exceptionSwallowedOnCallFromCom MDA

[!INCLUDE net-framework-specific]

The exceptionSwallowedOnCallFromCOM managed debugging assistant (MDA) is activated when an exception is thrown from common language runtime (CLR) code called from COM via a method that does not have an unmanaged HRESULT return type.

Symptoms

A call to a managed component from COM returns with a value of FALSE or 0. Alternatively, if the method has a void return type, there may be no indication that an exception was thrown during the execution of the method. In this case, the exception will be silently caught and execution will return to the COM caller.

Cause

An exception was thrown, but there is no valid way to report it.

Resolution

Informational only, not necessarily indicative of a bug.

Effect on the Runtime

This MDA has no effect on the CLR. It only reports data about silently caught exceptions.

Output

Informational message containing the method name, type name, and exception message.

Configuration

<mdaConfig>
  <assistants>
    <exceptionSwallowedOnCallFromCom />
  </assistants>
</mdaConfig>

See also