C# 手动/自动保存图片的实例代码

view plaincopy to clipboardprint?

//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;  
            }  
        }