C# Screen size without references in interactive

Question

I want to get the screen size of the primary screen, without adding any references (e.g. WinForms or Presentation). I found a similar question here, however there is no solution which doesn't include downloading or something like that.

But I want to make a method, which can be executed in the C# interactive on any other pc. Therefore I need a solution that doesn't reference other stuff than the standard (E.g. System, System.Core, ... is allowed).

I do know this is possible with

System.Windows.Forms.Screen.PrimaryScreen.Bounds;

but as this requires the System.Windows.Forms reference, it's not suitable for me. But basically the result of this snippet is what I want to get without references.

Answer 1

Here's an example I came up with.

I have noticed that it does not work correctly on High-DPI Screens. It will report the apparent resolution, not the actual resolution.

    static void Main(string[] args)
    {
        var size = GetScreenSize();
        Console.WriteLine(size.Length + " x " + size.Width);
        Console.ReadLine();
    }

    static Size GetScreenSize()
    {
        return new Size(GetSystemMetrics(0), GetSystemMetrics(1));
    }

    struct Size
    {
        public Size(int l, int w)
        {
            Length = l;
            Width = w;
        }

        public int Length { get; set; }
        public int Width { get; set; }
    }

    [DllImport("User32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
    public static extern int GetSystemMetrics(int nIndex);