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C # Resolution overload method

I have the following methods:

    static void OverloadedMethod(Action<ulong> handlerAction)
    {            
    }

    static void OverloadedMethod(Action<float> handlerAction)
    {
    }

    static void HandlerA(ulong dataProgress)
    {
    }

    static void HandlerB(float dataProgress)
    {
    }

I can call

OverloadedMethod(HandlerA);

no problem, but if i try to call

OverloadedMethod(HandlerB);

The compiler complains: Ambiguous call.

I read this article , but I don't understand why the compiler knows which method to choose if the parameter is ulong, but it cannot solve the same situation if the parameter is a float ...

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2 answers


According to MSDN , there is a predefined implicit conversion from ulong to float. As a result, the implicit conversion prevents the compiler from knowing which method to call.



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Take a look at covariance and contravariance here



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