How To Accept a File POST

Question

I m using asp net mvc 4 webapi beta to build a rest service   I need to be able to accept POSTed images files from client applications   Is this possible using the webapi   Below is how action I am currently using   Does anyone know of an example how this should work    HttpPost  public string ProfileImagePost HttpPostedFile profileImage        string   extensions       jpg     jpeg     gif     bmp     png         if   extensions Any x   gt  x Equals Path GetExtension profileImage FileName ToLower     StringComparison OrdinalIgnoreCase                  throw new HttpResponseException  Invalid file type    HttpStatusCode BadRequest                 Other code goes here      return   path to image png

User · Answer

I used Mike Wasson s answer before I updated all the NuGets in my webapi mvc4 project   Once I did  I had to re-write the file upload action       public Task lt HttpResponseMessage gt  Upload int id                HttpRequestMessage request   this Request          if   request Content IsMimeMultipartContent                          throw new HttpResponseException new HttpResponseMessage HttpStatusCode UnsupportedMediaType                       string root   System Web HttpContext Current Server MapPath    App Data uploads            var provider   new MultipartFormDataStreamProvider root            var task   request Content ReadAsMultipartAsync provider               ContinueWith lt HttpResponseMessage gt  o   gt                                FileInfo finfo   new FileInfo provider FileData First   LocalFileName                    string guid   Guid NewGuid   ToString                     File Move finfo FullName  Path Combine root  guid         provider FileData First   Headers ContentDisposition FileName Replace                               return new HttpResponseMessage                                         Content   new StringContent  File uploaded                                                        return task          Apparently BodyPartFileNames is no longer available within the MultipartFormDataStreamProvider

User · Answer

See the code below  adapted from this article  which demonstrates the simplest example code I could find   It includes both file and memory  faster  uploads   public HttpResponseMessage Post         var httpRequest   HttpContext Current Request      if  httpRequest Files Count  lt  1                return Request CreateResponse HttpStatusCode BadRequest              foreach string file in httpRequest Files                var postedFile   httpRequest Files file           var filePath   HttpContext Current Server MapPath        postedFile FileName           postedFile SaveAs filePath              NOTE  To store in memory use postedFile InputStream            return Request CreateResponse HttpStatusCode Created

User · Answer

Complementing Matt Frear s answer - This would be an ASP NET Core alternative for reading the file directly from Stream  without saving amp reading it from disk   public ActionResult OnPostUpload List lt IFormFile gt  files                try                       var file   files FirstOrDefault                var inputstream   file OpenReadStream                 XSSFWorkbook workbook   new XSSFWorkbook stream                var FIRST ROW NUMBER     firstRowWithValue                 ISheet sheet   workbook GetSheetAt 0                  Example  var firstCellRow    int sheet GetRow 0  GetCell 0  NumericCellValue               for  int rowIdx   2  rowIdx  lt   sheet LastRowNum  rowIdx                                       IRow currentRow   sheet GetRow rowIdx                      if  currentRow    null    currentRow Cells    null    currentRow Cells Count    lt  FIRST ROW NUMBER  break                     var df   new DataFormatter                                       for  int cellNumber     firstCellWithValue    cellNumber  lt    lastCellWithValue    cellNumber                                                       business logic  amp  saving data to DB                                                                                                    catch Exception ex                        throw new FileFormatException   Error on file processing -  ex Message

User · Answer

see http   www asp net web-api overview formats-and-model-binding html-forms-and-multipart-mime multipartmime  although I think the article makes it seem a bit more complicated than it really is   Basically    public Task lt HttpResponseMessage gt  PostFile           HttpRequestMessage request   this Request       if   request Content IsMimeMultipartContent                    throw new HttpResponseException HttpStatusCode UnsupportedMediaType                string root   System Web HttpContext Current Server MapPath    App Data uploads         var provider   new MultipartFormDataStreamProvider root         var task   request Content ReadAsMultipartAsync provider            ContinueWith lt HttpResponseMessage gt  o   gt                   string file1   provider BodyPartFileNames First   Value             this is the file name on the server where the file was saved           return new HttpResponseMessage                           Content   new StringContent  File uploaded                                    return task

User · Answer

Here is a quick and dirty solution which takes uploaded file contents from the HTTP body and writes it to a file  I included a  bare bones  HTML JS snippet for the file upload   Web API Method    Route  api myfileupload             HttpPost  public string MyFileUpload         var request   HttpContext Current Request      var filePath    C   temp      request Headers  filename        using  var fs   new System IO FileStream filePath  System IO FileMode Create                 request InputStream CopyTo fs             return  uploaded       HTML File Upload    lt form gt       lt input type  file  id  myfile   gt         lt input type  button  onclick  uploadFile     value  Upload    gt   lt  form gt   lt script type  text javascript  gt      function uploadFile                     var xhr   new XMLHttpRequest                             var file   document getElementById  myfile   files 0           xhr open  POST    api myfileupload            xhr setRequestHeader  filename   file name           xhr send file          lt  script gt

User · Answer

HttpPost  public JsonResult PostImage HttpPostedFileBase file        try               if  file    null  amp  amp  file ContentLength  gt  0  amp  amp  file ContentLength lt  10485760                        var fileName   Path GetFileName file FileName                                                        var path   Path Combine Server MapPath          HisloImages          fileName                file SaveAs path                region MyRegion                 save imag in Db               using  MemoryStream ms   new MemoryStream                                      file InputStream CopyTo ms                     byte   array   ms GetBuffer                                  endregion             return Json JsonResponseFactory SuccessResponse  Status 0  Message  OK    JsonRequestBehavior AllowGet                     else                       return Json JsonResponseFactory ErrorResponse  Status 1   Message  Upload Again and File Size Should be Less Than 10MB    JsonRequestBehavior AllowGet                       catch  Exception ex                 return Json JsonResponseFactory ErrorResponse ex Message   JsonRequestBehavior AllowGet

User · Answer

Here are two ways to accept a file   One using in memory provider MultipartMemoryStreamProvider and one using MultipartFormDataStreamProvider which saves to a disk   Note  this is only for one file upload at a time   You can certainty extend this to save multiple-files   The second approach can support large files   I ve tested files over 200MB and it works fine   Using in memory approach does not require you to save to disk  but will throw out of memory exception if you exceed a certain limit   private async Task lt Stream gt  ReadStream         Stream stream   null      var provider   new MultipartMemoryStreamProvider        await Request Content ReadAsMultipartAsync provider       foreach  var file in provider Contents                var buffer   await file ReadAsByteArrayAsync            stream   new MemoryStream buffer              return stream     private async Task lt Stream gt  ReadLargeStream         Stream stream   null      string root   Path GetTempPath        var provider   new MultipartFormDataStreamProvider root       await Request Content ReadAsMultipartAsync provider       foreach  var file in provider FileData                var path   file LocalFileName          byte   content   File ReadAllBytes path           File Delete path           stream   new MemoryStream content              return stream

User · Answer

The ASP NET Core way is now here    HttpPost  UploadFiles    public async Task lt IActionResult gt  Post List lt IFormFile gt  files        long size   files Sum f   gt  f Length           full path to file in temp location     var filePath   Path GetTempFileName         foreach  var formFile in files                if  formFile Length  gt  0                        using  var stream   new FileStream filePath  FileMode Create                                 await formFile CopyToAsync stream                                         process uploaded files        Don t rely on or trust the FileName property without validation       return Ok new   count   files Count  size  filePath

User · Answer

This question has lots of good answers even for  Net Core  I was using both Frameworks the provided code samples work fine  So I won t repeat it  In my case the important thing was how to use File upload actions with Swagger like this      Here is my recap   ASP  Net WebAPI 2   To upload file use  MultipartFormDataStreamProvider see answers here How to use it with Swagger    NET Core   To upload file use  IFormFile see answers here or MS documentation How to use it with Swagger

User · Answer

I m surprised that a lot of you seem to want to save files on the server  Solution to keep everything in memory is as follows    HttpPost  api upload    public async Task lt IHttpActionResult gt  Upload         if   Request Content IsMimeMultipartContent            throw new HttpResponseException HttpStatusCode UnsupportedMediaType         var provider   new MultipartMemoryStreamProvider        await Request Content ReadAsMultipartAsync provider       foreach  var file in provider Contents                var filename   file Headers ContentDisposition FileName Trim                var buffer   await file ReadAsByteArrayAsync              Do whatever you want with filename and its binary data             return Ok

User · Answer

I had a similar problem for the preview Web API  Did not port that part to the new MVC 4 Web API yet  but maybe this helps   REST file upload with HttpRequestMessage or Stream   Please let me know  can sit down tomorrow and try to implement it again

User · Answer

Toward this same directions  I m posting a client and server snipets that send Excel Files using WebApi  c  4   public static void SetFile String serviceUrl  byte   fileArray  String fileName        try               using  var client   new HttpClient                              client DefaultRequestHeaders Accept Add new MediaTypeWithQualityHeaderValue  application json                     using  var content   new MultipartFormDataContent                                          var fileContent   new ByteArrayContent fileArray     System IO File ReadAllBytes fileName                        fileContent Headers ContentDisposition   new ContentDispositionHeaderValue  attachment                                                 FileName   fileName                                            content Add fileContent                       var result   client PostAsync serviceUrl  content  Result                                        catch  Exception e                  Log the exception           And the server webapi controller   public Task lt IEnumerable lt string gt  gt  Post         if  Request Content IsMimeMultipartContent                  string fullPath   HttpContext Current Server MapPath    uploads            MyMultipartFormDataStreamProvider streamProvider   new MyMultipartFormDataStreamProvider fullPath           var task   Request Content ReadAsMultipartAsync streamProvider  ContinueWith t   gt                        if  t IsFaulted    t IsCanceled                      throw new HttpResponseException HttpStatusCode InternalServerError                var fileInfo   streamProvider FileData Select i   gt                                var info   new FileInfo i LocalFileName                   return  File uploaded as     info FullName          info Length                                    return fileInfo                       return task            else               throw new HttpResponseException Request CreateResponse HttpStatusCode NotAcceptable   Invalid Request                And the Custom MyMultipartFormDataStreamProvider  needed to customize the Filename   PS  I took this code from another post http   www codeguru com csharp  net uploading-files-asynchronously-using-asp net-web-api htm  public class MyMultipartFormDataStreamProvider   MultipartFormDataStreamProvider       public MyMultipartFormDataStreamProvider string path            base path                    public override string GetLocalFileName System Net Http Headers HttpContentHeaders headers                string fileName          if   string IsNullOrWhiteSpace headers ContentDisposition FileName                         fileName   headers ContentDisposition FileName                    else                       fileName   Guid NewGuid   ToString       data                     return fileName Replace       string Empty

User · Answer

API Controller     HttpPost  public HttpResponseMessage Post         var httpRequest   System Web HttpContext Current Request       if  System Web HttpContext Current Request Files Count  lt  1                  TODO           else            try                foreach  string file in httpRequest Files                         var postedFile   httpRequest Files file               BinaryReader binReader   new BinaryReader postedFile InputStream               byte   byteArray   binReader ReadBytes postedFile ContentLength                         catch  System Exception e                  TODO            return Request CreateResponse HttpStatusCode Created

[c#] How To Accept a File POST

Examples related to c#

Examples related to asp.net-mvc-4