File Upload (ashx+form)

context. Request.Files is not suitable for large files to operate, the following list is mainly for small file upload processing!

HTML Client section:

<formAction= "Upload.ashx"Method= "POST"enctype= "Multipart/form-data">Select File:<inputtype= "File"name= "File1" /><BR/>        <inputtype= "Submit"value= "Upload" />    </form>

General handler server side:

   Public voidProcessRequest (HttpContext context) {context. Response.ContentType="Text/plain"; Httppostedfile file1= Context. request.files["file1"]; Helper.uploadfile (File1,"~/upload/");//here is the call to the corresponding methodContext. Response.Write ("OK");//Prompt Execution Success}

Encapsulation of the Code:

/// <summary>        ///Upload Image/// </summary>        /// <param name= "file" >to express a submitted file through a form</param>        /// <param name= "Virpath" >the virtual path to save the file</param>         Public Static voidUploadimg (httppostedfile file,stringVirpath) {                      if(file. ContentLength >1024x768*1024x768*4)            {                Throw NewException ("file cannot be greater than 4M"); }            stringImgtype =path.getextension (file.            FileName); if(imgtype!=". jpg"&&imgtype!=". JPEG")//limit the type of picture            {                Throw NewException ("please upload a JPG or JPEG image"); }            using(Image img =bitmap.fromstream (file. InputStream)) {stringSavepath = HttpContext.Current.Server.MapPath (virpath+file.                FileName); Img.            Save (Savepath); }        }        /// <summary>        ///Uploading Files/// </summary>        /// <param name= "file" >to express a submitted file through a form</param>        /// <param name= "Virpath" >the virtual path to save the file</param>         Public Static voidUploadFile (httppostedfile file,stringVirpath) {            if(file. ContentLength >1024x768*1024x768*6)            {                Throw NewException ("file cannot be greater than 6M"); }            stringImgtype =path.getextension (file.            FileName); //imgtype to restrict uploaded files            if(Imgtype! =". zip"&& Imgtype! =". mp3")            {                Throw NewException ("only allow uploading zip, rar .... File"); }            stringDirfullpath=HttpContext.Current.Server.MapPath (Virpath); if(! Directory.Exists (Dirfullpath))//If the folder does not exist, create the folder first{directory.createdirectory (Dirfullpath); } file. SaveAs (Dirfullpath+file.        FileName); }

File Upload (ashx+form)