//手动保存图片           private void saveBtn_Click(object sender, System.EventArgs e)           {               bool isSave = true;               SaveFileDialog saveImageDialog = new SaveFileDialog();               saveImageDialog.Title = "图片保存";               saveImageDialog.Filter= @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";               if(saveImageDialog.ShowDialog() == DialogResult.OK)               {                   string fileName = saveImageDialog.FileName.ToString();                   if(fileName != "" && fileName != null)                   {                       string fileExtName = fileName.Substring(fileName.LastIndexOf(".")+1).ToString();                       System.Drawing.Imaging.ImageFormat imgformat = null;                            if(fileExtName!="")                       {                           switch(fileExtName)                            {                                case "jpg":                                    imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;                                    break;                                case "bmp":                                    imgformat = System.Drawing.Imaging.ImageFormat.Bmp;                                    break;                                case "gif":                                    imgformat = System.Drawing.Imaging.ImageFormat.Gif;                                    break;                                default:                                    MessageBox.Show("只能存取为: jpg,bmp,gif 格式");                                    isSave = false;                                   break;                            }                        }                       //默认保存为JPG格式                       if(imgformat == null)                       {                           imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;                       }                       if(isSave)                       {                           try                          {                                   this.pictureBox1.Image.Save(fileName,imgformat);                                   //MessageBox.Show("图片已经成功保存!");                           }                           catch                          {                               MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");                           }                       }                   }               }           }           //自动保存图片           private void Autosave()           {               string Opath =@"D:\VedioCapture\Photo";               string photoname = DateTime.Now.Ticks.ToString();               if (Opath.Substring(Opath.Length-1, 1) != @"\")                   Opath = Opath + @"\";               string path1 = Opath + DateTime.Now.ToShortDateString();               if (! Directory.Exists(path1))                             Directory.CreateDirectory(path1);               //pictureBox1.Image.Save(path1 +"\\" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);               //图像的缩小               System.Drawing.Bitmap objPic,objNewPic;               try              {                   objPic = new System.Drawing.Bitmap(pictureBox1.Image);                   objNewPic=new System.Drawing.Bitmap(objPic,pictureBoxShow.Width,pictureBoxShow.Height);                   //objNewPic=new System.Drawing.Bitmap(objPic,320,240);//图片保存的大小尺寸                   objNewPic.Save(path1 +"\\" + photoname + ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);               }               catch(Exception exp){throw exp;}               finally              {                   objPic=null;                   objNewPic=null;               }           }