Check inside method whether some optional argument was passed

Question

How do I check if an optional argument was passed to a method?

public void ExampleMethod(int required, string optionalstr = \"default string\",
    int optio         


        

Answer 1

You can't check that, because method with optional parameters is a regular method with all parameters, including those which have default values. So, your method will be compiled into:

public void ExampleMethod(int required, string optionalstr, int optionalint)
{

}

Default values are inserted by compiler in the call point. If you'll write

ExampleMethod(42);

Then compiler will generate call

ExampleMethod(42, "default string", 10);

You can compare if optionalstr or optionalint has value equal to default value, but you can't really say if it was provided by compiler or by developer.