c# - HttpPostedFileBase Is null -

im trying upload file, not work expected. have following view:

@using (ajax.beginform("registerband", "newprofile", new ajaxoptions() { httpmethod = "post",             insertionmode = insertionmode.replace,         }, new { enctype = "multipart/form-data"}))         {             @html.antiforgerytoken()             @html.validationsummary(true, "", new { @class = "text-danger" })               <div class="form-horizontal">                 <div class="form-group">                     <div class="col-md-10">                         bandname                     </div>                     <div class="col-md-10">                         @html.editorfor(x => x.bandprofile.name, new { htmlattributes = new { @class = "form-control" } })                         @html.validationmessagefor(x => x.bandprofile.name, "", new { @class = "text-danger" })                     </div>                 </div>                  <div class="form-group">                     <div class="col-md-10">                         genres                     </div>                     <div class="col-md-10">                         @html.dropdownlistfor(x => x.bandprofile.genres, enumerable.empty<selectlistitem>(), new { @class="", multiple = "multiple", style ="width: 100%;"} )                         @html.validationmessagefor(x => x.bandprofile.genres, "", new { @class = "text-danger" })                     </div>                 </div>                  <div class="form-group">                     <div class="col-md-10">                         coverpicture                     </div>                      <div class="col-md-10">                         <input type="file" name="file" id="coverpicture" />                          @html.validationmessagefor(x => x.bandprofile.coverpicture, "", new { @class = "text-danger" })                     </div>                 </div>                  <div class="form-group">                     <div class="col-md-10">                         description                     </div>                         <div class="col-md-10">                             @html.editorfor(x => x.bandprofile.description, new { htmlattributes = new { @class = "form-control"} })                             @html.validationmessagefor(x => x.bandprofile.description, "", new { @class = "text-danger" })                         </div>                     </div>                  <div class="form-group">                     <div class="col-md-offset-2 col-md-10">                         <input type="submit" value="spara" class="btn btn-success" />                     </div>                 </div>             </div>         } 

here controller:

   [httppost]         public actionresult registerband(profileviewmodel model, httppostedfilebase file)         {             if (modelstate.isvalid == false)             {                 return json(jsonrequestbehavior.allowget);             }              var bandprofile = _profileservice.createbandprofile(model.bandprofile, file, userid);              if (bandprofile != null)             {                 usermanager.addtorole(userid, "band");                 return redirecttoaction("index", "welcome");             }             return view("index");         } 

the problem have file results in null. can't understand why. can me find problem?

the issue here using ajax.beginform() helper create , post form. however, files cannot uploaded using ajax.

you may want consider using jquery-based plug-in accomplish this, relies on use of <iframe> handle uploading operations behind scenes , posting them proper location.

otherwise, consider trying normal form using html.beginform(), should work in scenario (if don't explicitly need of ajax functionality).

update

another issue here constructor using ajax.beginform() call accepting ajaxoptions , htmlattributes parameter, falls in constructor

however, current use missing third routevalues parameter. try adding null in there see if makes difference :

@using(ajax.beginform("registerband",                        "newprofile",                        null,                        new ajaxoptions() {                               httpmethod = "post",                               insertionmode = insertionmode.replace                       },                        new { enctype = "multipart/form-data"})){       <!-- content --> }