C # Binary picture string Mutual transfer

Functional Requirements:

1. Convert a picture (PNG bmp JPEG bmp GIF) to a byte array and store it in the database.

2. Converts a byte array read from the database to an Image object and assigns a value to the corresponding control display.

3, from the picture byte array to obtain the corresponding picture format, generates a picture to save to the disk.

The Image here is System.Drawing.Image.

1    // Get an image from file 2     Image image = Image.FromFile ("d:\\test.jpg"); 3     New Bitmap ("d:\\test.jpg");

The following three functions implement each of the three requirements:

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Drawing;4 usingSystem.Drawing.Imaging;5 usingSystem.IO;6 usingSystem.Linq;7 usingSystem.Text;8 9 namespaceNetutilitylibTen { One      Public Static classImagehelper A     { -         /// <summary> -         ///Convert Image to byte[] the         /// </summary> -         /// <param name= "image" ></param> -         /// <returns></returns> -          Public Static byte[] imagetobytes (image image) +         { -ImageFormat format =image. Rawformat; +             using(MemoryStream ms =NewMemoryStream ()) A             { at                 if(format. Equals (imageformat.jpeg)) -                 { - image. Save (MS, imageformat.jpeg); -                 } -                 Else if(format. Equals (imageformat.png)) -                 { in image. Save (MS, imageformat.png); -                 } to                 Else if(format. Equals (imageformat.bmp)) +                 { - image. Save (MS, imageformat.bmp); the                 } *                 Else if(format. Equals (imageformat.gif)) $                 {Panax Notoginseng image. Save (MS, imageformat.gif); -                 } the                 Else if(format. Equals (Imageformat.icon)) +                 { A image. Save (MS, Imageformat.icon); the                 } +                 byte[] buffer =New byte[Ms. Length]; -                 //Image.Save () changes the position of MemoryStream and requires a re-seek to begin $Ms. Seek (0, seekorigin.begin); $Ms. Read (Buffer,0, buffer. Length); -                 returnbuffer; -             } the         } - Wuyi         /// <summary> the         ///Convert byte[] to Image -         /// </summary> Wu         /// <param name= "buffer" ></param> -         /// <returns></returns> About          Public StaticImage Bytestoimage (byte[] buffer) $         { -MemoryStream ms =NewMemoryStream (buffer); -Image image =System.Drawing.Image.FromStream (MS); -             returnimage; A         } +  the         /// <summary> -         ///Convert byte[] to a picture and Store it in file $         /// </summary> the         /// <param name= "FileName" ></param> the         /// <param name= "buffer" ></param> the         /// <returns></returns> the          Public Static stringCreateimagefrombytes (stringFileName,byte[] buffer) -         { in             stringFile =FileName; theImage image =bytestoimage (buffer); theImageFormat format =image. Rawformat; About             if(format. Equals (imageformat.jpeg)) the             { theFile + =". JPEG"; the             } +             Else if(format. Equals (imageformat.png)) -             { theFile + =". PNG";Bayi             } the             Else if(format. Equals (imageformat.bmp)) the             { -File + =". bmp"; -             } the             Else if(format. Equals (imageformat.gif)) the             { theFile + =". gif"; the             } -             Else if(format. Equals (Imageformat.icon)) the             { theFile + =". Icon"; the             }94System.IO.FileInfo info =NewSystem.IO.FileInfo (file); the System.IO.Directory.CreateDirectory (info. Directory.fullname); the file.writeallbytes (File, buffer); the             returnfile;98         } About     } -}

C # Binary picture string Mutual transfer