C # Public helper Class Image helper class

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Image class:

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingSystem.IO;usingSystem.Drawing.Imaging;usingSystem.Drawing;usingsystem.web;namespacecommon{ Public  Static classImage {#regionImage format Conversion/// <summary>      ///Image Format Conversion/// </summary>      /// <param name= "Orifilename" >Original file relative path</param>      /// <param name= "Desiredfilename" >generate target file relative path</param>      /// <returns></returns>      ///jpg uses lossy compression, so JPG images may degrade image sharpness, and pixels will not degrade.///GIF uses lossless compression so GIF images do not degrade image sharpness and pixels, but GIF formats support only 256-color images.        Public Static BOOLConvertimage (stringOrifilename,stringdesiredfilename) {          stringExtname = desiredfilename.substring (Desiredfilename.lastindexof ('.')+1).          ToLower ();          ImageFormat Desiredformat; //according to the extension name, specify ImageFormat          Switch(extname) { Case "BMP": Desiredformat=imageformat.bmp;  Break;  Case "gif": Desiredformat=imageformat.gif;  Break;  Case "JPEG": Desiredformat=Imageformat.jpeg;  Break;  Case "ico": Desiredformat=Imageformat.icon;  Break;  Case "PNG": Desiredformat=imageformat.png;  Break; default: Desiredformat=Imageformat.jpeg;  Break; }          Try{System.Drawing.Image Imgfile=System.Drawing.Image.FromFile (Webpathtran (orifilename));              Imgfile.save (Webpathtran (desiredfilename), Desiredformat); return true; }          Catch           {              return false; }      }        #endregion      #regionPicture Zoom/// <summary>      ///Picture fixed size zoom/// </summary>      /// <param name= "Orifilename" >source file relative address</param>      /// <param name= "Desiredfilename" >destination file relative address</param>      /// <param name= "Intwidth" >Target file width</param>      /// <param name= "Intheight" >High target file</param>      /// <param name= "ImageFormat" >picture file Format</param>       Public Static BOOLChangeimagesize (stringOrifilename,stringDesiredfilename,intIntwidth,intintheight, ImageFormat imageformat) {            stringSourcefilenamestr =webpathtran (orifilename);//source picture name Path            stringTransferfilenamestr = Webpathtran (desiredfilename);//Destination picture name pathFileStream Myoutput =NULL; Try{System.Drawing.Image.GetThumbnailImageAbort Myabort=NewSystem.Drawing.Image.GetThumbnailImageAbort (Imageabort); Image Sourceimage= System.Drawing.Image.FromFile (Orifilename);//source Picture DefinitionImage targetimage = Sourceimage.getthumbnailimage (intwidth, Intheight, Myabort, IntPtr.Zero);//purpose Picture Definition//The targetfilenamestr picture is relaxed to intwidth, and the height is intheightMyoutput =NewFileStream (Transferfilenamestr, FileMode.Create, FileAccess.Write, fileshare.write);                Targetimage.save (Myoutput, ImageFormat);                Myoutput.close (); return true; }            Catch{myoutput.close (); return false; }                         }      Private Static  BOOLImageabort () {return false; }      #endregion      #regionText watermark/// <summary>        ///Text Watermark/// </summary>        /// <param name= "Wtext" >Watermark Text</param>        /// <param name= "source" >Original picture physical file name</param>        /// <param name= "target" >Generate picture Physical file name</param>         Public Static BOOLImagewatertext (stringWtext,stringSourcestringtarget) {            BOOLResflag =false; Image Image=image.fromfile (source); Graphics Graphics=graphics.fromimage (image); Try{graphics. DrawImage (Image,0,0, image. Width, image.              Height); Font Font=NewSystem.Drawing.Font ("Verdana", -); Brush Brush=NewSystem.Drawing.SolidBrush (System.Drawing.Color.Green); Graphics. DrawString (wtext, font, brush, *, *); Image.              Save (target); Resflag=true; }            Catch(Exception) {Throw; }            finally{graphics.                Dispose (); Image.                          Dispose (); }              returnResflag; }        #endregion      #regionImage watermark/// <summary>        ///Create a picture watermark on a picture/// </summary>        /// <param name= "Path" >Original server picture path</param>        /// <param name= "PATH_SYP" >Image path with picture watermark generated</param>        /// <param name= "PATH_SYPF" >Watermark Picture Path</param>       Public Static BOOLImagewaterpic (stringSourcestringTargetstringWaterpicsource) {            BOOLResflag =false; Image Sourceimage=image.fromfile (source); Graphics Sourcegraphics=graphics.fromimage (sourceimage); Image Waterpicsourceimage=Image.FromFile (Waterpicsource); Try{sourcegraphics. DrawImage (Waterpicsourceimage,NewSystem.Drawing.Rectangle (sourceimage. Width-waterpicsourceimage.width, Sourceimage. Height-waterpicsourceimage.height, Waterpicsourceimage.width, Waterpicsourceimage.height),0,0, Waterpicsourceimage.width, Waterpicsourceimage.height, GraphicsUnit.Pixel); Sourceimage.            Save (target); }            Catch(Exception) {Throw; }            finally{sourcegraphics.                Dispose (); Sourceimage.                Dispose ();            Waterpicsourceimage.dispose (); }            returnResflag; }        #endregion      /// <summary>      ///path conversion (converted to absolute path)/// </summary>      /// <param name= "path" ></param>      /// <returns></returns>      Private Static stringWebpathtran (stringpath) {          Try          {              returnHttpContext.Current.Server.MapPath (path); }          Catch          {              returnpath; }      }    }}

C # Public helper Class Image helper class