C# functions and optional parameters

Question

I know that in C# it is possible to define optional parameters. My question is directed at how flexible this is.

Let f be a function as below, with a mandatory and b, c optional :

class Test {
   public void f(int a, int b = 2, int c = 3) {
      //...
   }
}

Now, I know I can call the function in the following ways :

f(1) -> a equals 1, b equals 2, c equals 3

f(11,22) -> a equals 11, b equals 22, c equals 3

f(11,22,33) -> a equals 11, b equals 22, c equals 33

How do I do to not specify b, but a and c ?

Answer 1

Try:

f(11, c: 33)

And take a look at the documentation

Answer 2

You can prefix the parameter with the argument name:

f(1, c:3);