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Editorial Team
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Asked: 2026-05-13T18:09:38+00:00

In C# 4, when deriving from DynamicObject and overridding TryInvokeMember, how can one determine

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In C# 4, when deriving from DynamicObject and overridding TryInvokeMember, how can one determine whether any parameters supplied at the call site have been passed with out or ref semantics? I can see some private fields in the supplied binder that contain this information (namely the Microsoft.CSharp.RuntimeBinder.ICSharpInvokeOrInvokeMemberBinder.ArgumentInfo property) but it appears to be inaccessible. I assume this information must be available somewhere otherwise it would limit one’s knowledge of supplied input pretty severely.

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1 Answer

  1. Editorial Team

    I talked to the DLR team about that. Unfortunately, the answer is no, this information is not available for DynamicObject.

    The reason is that ref/out parameters are very C# specific. And dynamic objects can be shared between many languages and not all langauges have these notations. DynamicObject is “call-by-value”, so your objects can be consumed by different APIs.

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