winfrom 保存图片

  private void btnSave_Click(object sender, EventArgs e)
         {
             SaveFileDialog sfd = new SaveFileDialog();
             sfd.Filter = "BMP (*.bmp)|*.bmp|GIF (*.gif)|*.gif|JPG (*.jpg)|*.jpg|PNG (*.png)|*.png|TIFF (*.tif)|*.tif";
             sfd.AddExtension = true;
             if (sfd.ShowDialog() == DialogResult.OK)
             {
                 SaveTypes savetype = SaveTypes.UNSPECIFIED;
                 switch (sfd.FilterIndex)
                 {
                            //图片格式
                     case :  savetype = SaveTypes.BMP; break;
                     case :  savetype = SaveTypes.GIF; break;
                     case :  savetype = SaveTypes.JPG; break;
                     case :  savetype = SaveTypes.PNG; break;
                     case :  savetype = SaveTypes.TIFF; break;
                     default: break;
                 }
                 SaveImage(sfd.FileName, savetype, barcode.Image);
             }
         }

     public enum SaveTypes : int { JPG, BMP, PNG, GIF, TIFF, UNSPECIFIED }

  public void SaveImage(string Filename, SaveTypes FileType, Image image)
         {
             try
             {
                 if (image != null)
                 {
                     ImageFormat imageformat;
                     switch (FileType)
                     {
                         case SaveTypes.BMP: imageformat = ImageFormat.Bmp; break;
                         case SaveTypes.GIF: imageformat = ImageFormat.Gif; break;
                         case SaveTypes.JPG: imageformat = ImageFormat.Jpeg; break;
                         case SaveTypes.PNG: imageformat = ImageFormat.Png; break;
                         case SaveTypes.TIFF: imageformat = ImageFormat.Tiff; break;
                         default: imageformat = ImageFormat.Bmp; break;
                     }
                     ((Bitmap)image).Save(Filename, imageformat);
                 }
             }
             catch (Exception ex)
             {
                 throw new Exception(" 无法保存图像。" + ex.Message);
             }
         }