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invalidMemberDeclaration MDA

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Note

This article is specific to .NET Framework. It doesn't apply to newer implementations of .NET, including .NET 6 and later versions.

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 MarshalAsAttribute attribute on one of the parameters.

Resolution

Specify valid 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