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//選擇圖片路徑 private void btnOld_Click(object sender, EventArgs e) {     OpenFileDialog ofd = new OpenFileDialog();     ofd.Filter = "圖片|*.jpg;*.jpeg;*.png";     if (ofd.ShowDialog() == DialogResult.OK)     {         txtOld.Text = ofd.FileName;     } }
 //選擇保存路徑 private void btnNew_Click(object sender, EventArgs e) {     FolderBrowserDialog fbd = new FolderBrowserDialog();     fbd.ShowNewFolderButton = true;     if (fbd.ShowDialog() == DialogResult.OK)     {         txtNew.Text = fbd.selectedPath;     } }
//壓縮private void btnCompressSize_Click(object sender, EventArgs e){    ImgSizeCompress(10L);    ImgSizeCompress(50L);    ImgSizeCompress(70L);    MessageBox.Show("成功");}
  //壓縮方法   private void ImgSizeCompress(long level)   {       Image img = Image.fromFile(txtOld.Text);       ImageFormat imgFormat = img.RawFormat;
       Size newSize = new Size(img.Width / 2, img.Height / 2);       Bitmap outBmp = new Bitmap(newSize.Width, newSize.Height);
       Graphics g = Graphics.fromImage(outBmp);       g.CompositingQuality = CompositingQuality.HighQuality;       g.SmoothingMode = SmoothingMode.HighQuality;       g.InterpolationMode = InterpolationMode.HighQualityBicubic;       g.DrawImage(img, new Rectangle(0, 0, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);       g.Dispose();       img.Dispose();
       EncoderParameters encoderParams = new EncoderParameters();       encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, level);
       ImageCodecInfo codecInfo = GetEncoder(imgFormat);       string savePath = txtNew.Text + "\\" + DateTime.Now.Ticks + "." + codecInfo.FormatDescription;       outBmp.Save(savePath, codecInfo, encoderParams);       outBmp.Dispose();   }
 private ImageCodecInfo GetEncoder(ImageFormat format) {     ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();     foreach (ImageCodecInfo codec in codecs)     {         if (codec.FormatID == format.Guid)         {             return codec;         }     }     return null; }