Editing Variadic function (section)

===In C#===
[[C Sharp (programming language)|C#]] describes variadic functions using the {{code|params}} keyword. A type must be provided for the arguments, although {{code|object[]}} can be used as a catch-all. At the calling site, you can either list the arguments one by one, or hand over a pre-existing array having the required element type. Using the variadic form is [[Syntactic sugar]] for the latter.

<syntaxhighlight lang="c#" highlight="5,16-17,19">
using System;

class Program
{
    static int Foo(int a, int b, params int[] args)
    {
        // Return the sum of the integers in args, ignoring a and b.
        int sum = 0;
        foreach (int i in args)
            sum += i;
        return sum;
    }
        
    static void Main(string[] args)
    {
        Console.WriteLine(Foo(1, 2));  // 0
        Console.WriteLine(Foo(1, 2, 3, 10, 20));  // 33
        int[] manyValues = new int[] { 13, 14, 15 };
        Console.WriteLine(Foo(1, 2, manyValues));  // 42
    }
}
</syntaxhighlight>