IFormFile is always empty in Asp.Net Core WebAPI

Question

I have a problem here when I am trying to push data with angularjs controller. But what ever I do (IFormFile file) is always empty. There are only some examples with razor syntax but no examples how to do it with angular or jquery.

HTML:

<form class="form-body" enctype="multipart/form-data" name="newFileForm" ng-submit="vm.addFile()"><input type="file" id="file1" name="file" multiple ng-files="getTheFiles($files)"/></form>

Directive:

(function() {
'use strict';

angular
    .module('app')
    .directive('ngFiles', ['$parse', function ($parse) {

    function fn_link(scope, element, attrs) {
        var onChange = $parse(attrs.ngFiles);
        element.on('change', function (event) {
            onChange(scope, { $files: event.target.files });
        });
    };

    return {
        link: fn_link
    };
    }]);
})();

Controller

var formdata = new FormData();
    $scope.getTheFiles = function ($files) {
        angular.forEach($files, function (key, value) {
            formdata.append(key, value);
        });
    };

vm.addFile = function () {                                              
        var xhr = new XMLHttpRequest();
        xhr.open('POST', url, true);
        xhr.setRequestHeader("Content-Type", "undefined");
        xhr.send(formdata);          
    }

Asp.net core webapi:

[HttpPost]
    public async Task<IActionResult> PostProductProjectFile(IFormFile file)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        ....
        return ...;
    }

I have also tried to do it with formdata, as it is constructed when you post it with razor syntax. Something like this:

dataService.addFile(formdata, {
            contentDisposition: "form-data; name=\"files\"; filename=\"C:\\Users\\UserName\\Desktop\\snip_20160420091420.png\"",
            contentType: "multipart/form-data",
                    headers: {
                        "Content-Disposition": "form-data; name=\"files\"; filename=\"C:\\Users\\UserName\\Desktop\\snip_20160420091420.png\"",
                        'Content-Type': "image/png"
                    },
                    fileName: "C:\\Users\\UserName\\Desktop\\snip_20160420091420.png",
                    name: "files",
                    length : 3563
            }

Also instead of formData to provide raw file as I wrote in comment. But still nothing happens

Answer 1

This is how to do it with angularjs:

vm.addFile = function () {                      
                var fileUpload = $("#file").get(0);
                var files = fileUpload.files;
                var data = new FormData();
                for (var i = 0; i < files.length ; i++) {
                    data.append(files[i].name, files[i]);
                }


                $http.post("/api/Files/", data, {
                    headers: { 'Content-Type': undefined },
                    transformRequest: angular.identity
                }).success(function (data, status, headers, config) {

                }).error(function (data, status, headers, config) {

                });
}

And in web Api:

[HttpPost]
public async Task<IActionResult> PostFile()
{
 //Read all files from angularjs FormData post request
 var files = Request.Form.Files;
 var strigValue = Request.Form.Keys;
 .....
}

Or like this:

    [HttpPost]
    public async Task<IActionResult>  PostFiles(IFormCollection collection)
    {
        var f = collection.Files;                         

            foreach (var file in f)
            {
                //....
             }           
    }