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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!");   
                        }   
             
 

