在C＃。NET中合并两个图像

基本上，我在我们的一个应用程序中使用了它：我们想在一个视频帧上叠加一个播放图标：

Image playbutton;try{    playbutton = Image.FromFile();}catch (Exception ex){    return;}Image frame;try{    frame = Image.FromFile();}catch (Exception ex){    return;}using (frame){    using (var bitmap = new Bitmap(width, height))    {        using (var canvas = Graphics.FromImage(bitmap))        { canvas.InterpolationMode = InterpolationMode.HighQualityBicubic; canvas.DrawImage(frame,       new Rectangle(0,          0,          width,          height),       new Rectangle(0,          0,          frame.Width,          frame.Height),       GraphicsUnit.Pixel); canvas.DrawImage(playbutton,       (bitmap.Width / 2) - (playbutton.Width / 2),       (bitmap.Height / 2) - (playbutton.Height / 2)); canvas.Save();        }        try        { bitmap.Save(,  System.Drawing.Imaging.ImageFormat.Jpeg);        }        catch (Exception ex) { }    }}