Method Overloading with Optional Parameter

Question

I have a class as follows with two overload method.

Class A
{
    public string x(string a, string b)
    {
        return \"hello\" + a + b;
    }

    publ         


        

Answer 1

Use of named and optional arguments affects overload resolution:

If two candidates are judged to be equally good, preference goes to a candidate that does not have optional parameters for which arguments were omitted in the call. This is a consequence of a general preference in overload resolution for candidates that have fewer parameters.

Reference: MSDN

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Implying the above rule method with 2 parameters string x(string a,string b) will be called.

Note: If both overloaded methods have optional parameters then compiler will give compile-time ambiguity error.

Answer 2

It will always execute method which first match with exact no of parameters, in your case it will execute :

Optional parameter method priority is less then the function with exact no of parameters

public string x(string a, string b);

Answer 3

If you call the Method with two Parameters, it uses the Method with two Parameters. If you'd call the one with three, it would use the other.