WPF Bitmap转imagesource

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)
{
    IntPtr hBitmap = bitmap.GetHbitmap();
    ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
        hBitmap,
        IntPtr.Zero,
        Int32Rect.Empty,
        BitmapSizeOptions.FromEmptyOptions());

    if (!DeleteObject(hBitmap))
    {
        throw new System.ComponentModel.Win32Exception();
    }
    return wpfBitmap;
}