C# params object[] strange behavior

Question

Considering this code

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] strings = new string[] { "Test1", "Test2", "Test3" };

            int[] ints = new int[] { 1, 2, 3, 4 };

            Test(strings);

            Test(ints);
        }

        public static void Test(params object[] objects)
        {
        }
    }
}

And this page https://msdn.microsoft.com/fr-ca/library/w5zay9db.aspx

I would expect (params object[] objects) to be an array of one element with a string[] as the first element, but when I debug, I see that (params object[] objects) is { "Test1", "Test2", "Test3" }.

However, with an int[], I get an object[] with int[] as first element.

Is this undefined behavior? Does that depend on the .Net framework version / Mono version?

C# params object[] strange behavior

3 Answers