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Asked: 2026-06-03T01:03:33+00:00

Why i cannot declare default arguments for member functions of a managed type or

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Why i cannot declare default arguments for member functions of a managed type or generic functions? C# 4.0 introduced Named and Optional Arguments; there is a similar thing for CLI?

I do not understand why is not possible to declare a method like this:

void Optional(int argument = 0);

And then when I call Optional(); the compiler does not translate this call into: Optional(0);.

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1 Answer

  1. Editorial Team

    It looks like the C++/CLI Compiler doesn’t emit the correct IL directive for that. It doesn’t emit the directive .param [1] = int32(0), which C# uses for recognizing default parameters. If you open the generated assembly in ILDasm, you’ll see it.

    A way that compiles would be to use the attributes Optional and DefaultParameterValue from the System::Runtime::InteropServices namespace, but C# doesn’t use those for default parameters, so currently there’s no easy way around creating an overload.

    You can find the question asking about those Attributes here: https://stackoverflow.com/a/4974528/93652

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