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invalidmemberdeclaration-mda.md

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title description ms.date helpviewer_keywords ms.assetid
invalidMemberDeclaration MDA
Review the invalidMemberDeclaration managed debugging assistant, which is invoked if a failure HRESULT is returned to COM without calling the managed method.
03/30/2017
invalid member declaration
InvalidMemberDeclaration MDA
marshaling, run-time errors
managed debugging assistants (MDAs), marshalling
MDAs (managed debugging assistants), marshalling
a84dd9a3-d6cf-4824-989a-ecbbf443eeb4

invalidMemberDeclaration MDA

The invalidMemberDeclaration managed debugging assistant (MDA) is activated to report an error that occurs while determining how to marshal the parameters of a member to be called from COM.

Symptoms

A failure HRESULT is returned to COM without the managed method having been called.

Cause

This is most likely due to an incompatible xref:System.Runtime.InteropServices.MarshalAsAttribute attribute on one of the parameters.

Resolution

Specify valid xref:System.Runtime.InteropServices.MarshalAsAttribute attributes on the parameters.

Effect on the Runtime

This MDA has no effect on the CLR.

Output

An informational message containing the member name, type name, and error message.

Configuration

<mdaConfig>  
  <assistants>  
    <invalidMemberDeclaration/>  
  </assistants>  
</mdaConfig>

See also