C# 手动/自动保存图片

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//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;   
            }   
        }