When method overloading involves optional parameters, the compiler gives preference to the method with no optional parameters involved first. For example, consider the below method overload definitions:
public void Add(int a, int b, int c = 5)
{
Console.WriteLine($"{a} + {b} + {c} = {a + b + c}");
}
public void Add(int a, int b)
{
Console.WriteLine($"{a} + {b} = {a + b}");
}
The outputs when called with the below arguments is as below:
p.Add(2, 3, 6); // 2 + 3 + 6 = 11
p.Add(4, 5); // 4 + 5 = 9
In the second call, even though the overload with optional parameter c is a valid match the compiler picks up the overload with two arguments for the execution. This is because the compiler gives the priority to the variable arguments over the substitutable constants.
