Pass a List to a params parameter

Question

Is there was a way to pass a List as an argument to a params parameter? Suppose I have a method like this:

void Foo(params int[] numbers)
{
    // ...
}

This way I can call it by passing either an array of ints or ints separated by commas:

int[] numbers = new int[] { 1, 5, 3 };
Foo(numbers);
Foo(1, 5, 3);

I wanted to know if there is a way to also be able to pass a List as an argument (without having to convert it to an array). For example:

List<int> numbersList = new List<int>(numbers);
// This won't compile:
Foo(numbersList);

Answer 1

No

Sadly, that's the answer. No, there is not. Not without converting it to an array (for example with .ToArray()).

Answer 2

You would want to change Foo to accept something other than params int[] to do this.

void Foo(IEnumerable<int> numbers) {
}

This would allow you to pass in either an int[] or a List<int>

To allow both ways, you could do this:

void Foo(params int[] numbers) {
   Foo((IEnumerable<int>)numbers);
}
void Foo(IEnumerable<int> numbers) {
   //Do the real thing here
}