Asp.net instance: Adjust the Image Upload ratio to the optimum.

　　ASP. NET documentWhen developing website programs, we often encounter Image Upload functions, especially in CMS applications. How can we make the uploaded images adaptive, this does not affect image quality. Today, we will share a code that will reduce the proportion of uploaded images and will not affect resolution.

# Region generating thumbnails    /// <Summary>    /// Generate a thumbnail    /// </Summary>    /// <Param name = "filePath"> input image path </param>    Private void SaveImage (string filePath)    {        String fileName = Path. GetExtension (File1.PostedFile. FileName). ToLower ();        String _ filename = DateTime. Now. ToString ("yyMMddHHmm ");        System. Drawing. Image image = null, aNewImage = null;        // Below is the thumbnail generated        Int newwidth = 0, newheight = 0;        Image = System. Drawing. Image. FromFile (filePath );        System. Drawing. Image. GetThumbnailImageAbort callb = new System. Drawing. Image. GetThumbnailImageAbort (ThumbnailCallback );        // Take the height and width         Int phWidth = image. Width;        Int phHeight = image. Height;        // Set the thumbnail width and height        If (phWidth> 110)        {            // Specify the width            Newwidth = 110;            // Calculate the height based on the width            Newheight = phHeight * newwidth/phWidth;        }        ANewImage = image. GetThumbnailImage (newwidth, newheight, callb, new System. IntPtr ());        // Rename and save the thumbnail        ANewImage. Save (Server. MapPath ("~ /Upload/") +" Avaster _ "+ DateTime. Now. ToString (" yyMMddHHmm ") + fileName );        Image. Dispose ();    }    # Endregion