Upload images for Windows Phone development

The first is the background class

/// <Summary> /// upload a file /// </Summary> public class uploadfile {public uploadfile () {}/// <summary> /// implement the file name based on the file name, file type, and file stream /// </Summary> /// <Param name = "FILENAME"> file name </param> // <Param name = "stream"> file data stream </param> Public uploadfile (string filename, stream stream) {This. filename = system. io. path. getfilename (filename); this. contenttype = getcontenttype (this. filename); this. filestream = stream ;} /// <Summary> /// file name /// </Summary> Public String filename {Get; private set ;} /// <summary> /// file type /// </Summary> Public String contenttype {Get; private set ;} /// <summary> /// local file path /// </Summary> private string filepath {Get; set ;} /// <summary> // file data stream // </Summary> Public stream filestream {Get; private set ;} /// <summary> /// write the current file data to a data stream // </Summary> /// <Param name = "Stream"> </param> Public void writeto (Stream stream) {byte [] buffer = new byte [512]; int size = 0; If (this. filestream! = NULL) {// write the file stream while (size = This. filestream. read (buffer, 0, buffer. length)> 0) {stream. write (buffer, 0, size) ;}} if (! String. isnullorempty (this. filepath) & file. exists (this. filepath) {// write using (system. io. filestream reader = new filestream (this. filepath, filemode. open, fileaccess. read) {While (size = reader. read (buffer, 0, buffer. length)> 0) {stream. write (buffer, 0, size );}}}} /// <summary> /// obtain the file type based on the file extension /// </Summary> /// <Param name = "FILENAME"> file name </param> // /<returns> </returns> Private Static string getcontenttype (string filename) {var fileext = system. io. path. getextension (filename); Return getcommonfilecontenttype (fileext );} /// <summary> /// obtain the file type of the common file /// </Summary> /// <Param name = "fileext"> file extension. for example ". jpg ",". GIF ", etc. </param> /// <returns> </returns> Private Static string getcommonfilecontenttype (string fileext) {Switch (fileext) {Case ". jpg ": Case ". JPEG ": Return" image/JPEG "; case ". GIF ": Return" image/GIF "; case ". BMP ": Return" image/BMP "; case ". PNG ": Return" image/PNG "; default: Return" application/octetstream ";}/// <summary> // compress the image and only adjust the quality, do not adjust the resolution /// </Summary> /// <Param name = "Soucre"> image stream </param> /// <Param name = "quality"> quality 1 -100 </param> Public static stream compression (Stream soucres) {var Quality = 80; soucret. seek (0, seekorigin. begin); var P = Quality/100.0; var writeablebitmap = picturedecoder. decodejpeg (soucres); var width = writeablebitmap. pixelwidth * P; var Height = writeablebitmap. pixelheight * P; var outstream = new memorystream (); writeablebitmap. savejpeg (outstream, (INT) width, (INT) height, 0, quality); outstream. seek (0, seekorigin. begin); return outstream ;}}

Then there is the call from the front-end

/// <Summary> /// Image Upload processing /// </Summary> /// <Param name = "sender"> </param> /// <Param name = "E"> </param> private void photochoosertask_completed (Object sender, photoresult e) {try {If (E. chosenphoto! = NULL) {stream S = uploadfile. compression (E. chosenphoto); bytepic = streamtobytes (s); encoding myencoding = encoding. getencoding ("UTF-8"); strpic = convert. tobase64string (bytepic); existspic = true ;}} catch (exception) {Throw ;}} /// <summary> // byte stream conversion // </Summary> /// <Param name = "stream"> </param> // <returns> </returns> Public byte [] streamtobytes (Stream) {byte [] bytes = new byte [stream. length]; stream. read (bytes, 0, bytes. length); // set the current stream position to the starting stream of the stream. seek (0, seekorigin. begin); return bytes ;}