A Web site, the picture data must exist; how to deal with storing pictures, there are a lot of ways.
Own summary in two ways: 1, save the picture as a static document form; (advantages: easy file transfer, backup; Disadvantages: not easy to recover lost files) 2, the picture is converted into a stream of bytes eligible for other ways to obtain a complete picture data storage ( advantages: save the database, easily lost; drawback: the database space is growing rapidly)
Before saving the picture is not the picture of the original content is processed by the file name and other basic information stored; recently wanted to carry out another way to save picture data; special record.
Save the file complete information, common way is to convert the file to a binary stream, saved to the database, of course, you can save the image as a base64 data stream.
1, tools: database SQLServer 2012 R2; development languages: C #; display formats: for web display processing by MVC.
2, the core database field describes the image information table: the FileContent a varbinary (max) NULL , ---- image content storage field, the field type varbinary (max) -> C # in the corresponding field type byte []
3, get a picture file byte stream (for database storage)
/// <Summary> /// Returns the path of the image based on the image byte stream byte [] /// </ Summary> /// <param name = "the imagePath"> Image Path </ param> /// <Returns > returns the byte stream </ returns> public static byte [] getImageByte ( String the imagePath) { the FileStream Files = new new the FileStream (the imagePath, FileMode.Open); byte [] = imgByte new new byte [files.Length]; files.Read (imgByte, 0 , imgByte.Length); files.Close (); return imgByte; }
4, the acquired images stored in the database byte stream
/// <the Summary> /// add images to the content information database /// </ the Summary> /// <param name = "path"> </ param> /// <returns A> </ returns A> public static int InsertImg ( String path) { // ---------- way the document image read and converted into a byte stream the FileStream FS = new new the FileStream (path, FileMode.Open); byte [] = imgSourse new new byte [fs.Length]; fs.Read (imgSourse, 0 , imgSourse.Length); fs.Close (); //--------------读取图片并转化成字节流结束---------------- using (SqlConnection conn = new SqlConnection(SqlHelper.connStr)) { conn.Open(); using (SqlCommand cmd = conn.CreateCommand()) { //cmd.CommandText = "update PictureInfo set FileContent=@ImageLogo "; cmd.CommandText = "insert into PictureInfo (FileContent) VALUES FileContent=@fileContent"; //cmd.Parameters.Add("@fileContent", System.Data.SqlDbType.Image); cmd.Parameters.Add(new SqlParameter("@fileContent", imgSourse)); return cmd.ExecuteNonQuery(); } } }
5, read the information in the database images to show the page (Winform There Picture controls can be used directly Image display; MVC need to do some processing.)
(1), Winform in show
/// <Summary> /// show a single image to the page /// </ Summary> public void ReturnImageShow () { // ..... data acquisition process is omitted // Get a picture stored in the byte stream byte [] ImageLogoArray = Row [ " FileContent " ] IS DBNull? null : ( byte []) (Row [ " FileContent " ]); MemoryStream MS = null ; IF (ImageLogoArray =! null ) { MS= new MemoryStream(ImageLogoArray); this.picBox.Image = new Bitmap(ms); } }
(2), MVC is shown in (background)
// GET: Pictures / Index /// <the Summary> /// data display method (using js foreground processing, call the rendering img src) /// </ the Summary> /// <returns A> </ returns A> public ActionResult Index () { the using (DbContext the DataContext = new new the DataContext ()) { // Get a list of data to be presented PictureInfoService InfoService = new new PictureInfoService (DbContext); var userList = dbContext.Set <PictureInfo> (); // pass the value list <T > data ViewData [ " PicInfo" ] = UserList.ToList (); } return View (); } // the GET: Pictures / IndexAdv /// <Summary> /// display data (background image label directly spliced content page using the page directly by value method rendering) /// </ Summary> /// <Returns> </ Returns> public ActionResult IndexAdv () { the using (DbContext the DataContext = new new the DataContext ()) { // get the data PictureInfoService InfoService = new new PictureInfoService (DbContext) ; var userList = dbContext.Set <PictureInfo>(); // background formatting text directly read the StringBuilder Builder = new new the StringBuilder (); the foreach ( var Data in userList) { // Here src attribute byte stream back to point assignment requires conversion method builder.AppendFormat ( " <div class = \ "item \"> <img id = \ "image {0} \" src = \ "../ Pictures / ReturnPic? id = {1} & random = Math.random () \" title = \ "{ } 2 \ "/> </ div> " , data.id, data.id, data.FileName); } // background mosaic page tab // the MVC (non-Core) identifying reception using HTML @ Html.Raw (ViewBag .DataBuilder) = ViewBag.DataBuilder builder.toString (); } return View (); } /// <Summary> /// Returns image (add background image processing method of the byte stream) /// </ Summary> /// <param name = "id"> query (id index) </ param> /// <Returns> </ Returns> public FileStreamResult ReturnPic ( int ID) { the using (DbContext the DataContext = new new the DataContext ()) { // the present using the the EF, only exemplary; main acquired image corresponding to contents information byte [] PictureInfoService InfoService = new newPictureInfoService (DbContext); var Data = infoService.Find <PictureInfo> (ID); // the acquired byte stream into the MemoryStream, for returning // the MVC byte stream in front display images, require special handling, // return type FileStreamResult the MemoryStream MS = new new the MemoryStream (data.FileContent); return new new FileStreamResult (MS, " Image / JPEG " ); } }
(3), MVC show reception section
IndexAdv.cshtml
Index.cshtml
6, the general image conversion encapsulation byte stream
using System.Drawing; using System.IO; public class ImgTransHelper { /// <summary> /// 图片转换成字节流 /// </summary> /// <param name="img">要转换的Image对象</param> /// <returns>转换后返回的字节流</returns> public static byte[] ImgToByt(Image img) { MemoryStream ms = new MemoryStream(); byte[] imagedata = null; img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); imagedata = ms.GetBuffer(); return imagedata; } /// <summary> /// 字节流转换成图片 /// </summary> /// <param name="byt">要转换的字节流</param> /// <returns>转换得到的Image对象</returns> public static Image BytToImg(byte[] byt) { MemoryStream ms = new MemoryStream(byt); Image img = Image.FromStream(ms); return img; } /// <summary> /// 根据图片路径返回图片的字节流byte[] /// </summary> /// <param name="imagePath">图片路径</param> /// <returns>返回的字节流</returns> private static byte[] getImageByte(string imagePath) { FileStream files = new FileStream(imagePath, FileMode.Open); byte[] imgByte = new byte[files.Length]; files.Read(imgByte, 0, imgByte.Length); files.Close(); return imgByte; } }
以上为记录内容，如有不足之处，欢迎指正！