Move a borderless window in wpf

Question

In my C# WinForms app I have a main window that has its default controls hidden.

So to allow me to move it around I added the following to the main window:

private const int WM_NCHITTEST = 0x84;
private const int HTCLIENT = 0x1;
private const int HTCAPTION = 0x2;
private const int WM_NCLBUTTONDBLCLK = 0x00A3;

protected override void WndProc(ref Message message)
{
    if (message.Msg == WM_NCLBUTTONDBLCLK)
    {
        message.Result = IntPtr.Zero;
        return;
    }

    base.WndProc(ref message);

    //Allow window to move
    if (message.Msg == WM_NCHITTEST && (int)message.Result == HTCLIENT)
        message.Result = (IntPtr)HTCAPTION;
}

I have a WPF App where I have also hidden the default controls and I want to do the same. I see that the main window is derived from a 'Window' so the above code does not work. How do I do this in WPF?

Solution

It's super simple, here:

private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
{
    DragMove();
}