XlTable clipboard format used by Excel in DDE

XlTableFormat.ClipboardId.cs

#if WINFORMS
using System.Windows.Forms;

static partial class XlTableFormat
{
    static int? _clipboardId;
    public static int ClipboardId { get { return (_clipboardId ?? (_clipboardId = DataFormats.GetFormat("XlTable").Id)).Value; }}
}
#else
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;

static partial class XlTableFormat
{
    static readonly Lazy<int> CachedClipboardId = new Lazy<int>(() => (int) LastErrorGate(() => RegisterClipboardFormat("XlTable")));

    public static int ClipboardId { get { return CachedClipboardId.Value; }}

    static uint LastErrorGate(Func<uint> api)
    {
        var result = api();
        if (result == 0) throw new Win32Exception();
        return result;
    }

    [DllImport("user32.dll", SetLastError = true)]
    public static extern uint RegisterClipboardFormat(string lpszFormat);
}
#endif