protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
if (HasBuiltInScaling)
{
this.SystemDpi = Dpi.FromVisual(this);
}
else
{
this._source = (HwndSource)PresentationSource.FromVisual(this);
if (this._source == null)
{
return;
}
this._source.AddHook(this.WndProc);
this.SystemDpi = Dpi.FromPresentationSource(this._source);
}
this.WindowDpi = this.SystemDpi;
}