angularjs - Converting base64 to file and posting using formdata append gives 0 contentlenght for httppostedfilebase -

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when try convert base64 image url--> blob--> file --> post controller using formdata.append, works smooth desktop fails work in iphone 6s chrome/firefox or ie, httppostedfilebase contentlength seems "0" javascript: 

croppedpicupload: function () {          function datauritoblob(datauri) {             // convert base64/urlencoded data component raw binary data held in string             var bytestring;             if (datauri.split(',')[0].indexof('base64') >= 0)                 bytestring = atob(datauri.split(',')[1]);             else                 bytestring = unescape(datauri.split(',')[1]);             // separate out mime component             var mimestring = datauri.split(',')[0].split(':')[1].split(';')[0];              var content = new array();             (var = 0; < bytestring.length; i++) {                 content[i] = bytestring.charcodeat(i)             }             return new blob([new uint8array(content)], { type: mimestring });         }         var imagebase64 = $("#croppedpic").attr("src");         var blob = datauritoblob(imagebase64);         var file = new file([blob], $scope.uploadedpicturefile.name, { type: $scope.uploadedpicturefile.type });         $scope.uploadprofilepic(file, "");     },     uploadprofilepic: function (files, iconid) {         var formdata = new formdata();         formdata.append("clientid", $("#partnerid").val());         formdata.append("siteid", $("#siteid").val());         formdata.append("sessionid", $("#cookievalue").val());         formdata.append("iconid", iconid);         if (files != "") {             alert(files);             formdata.append("file", files);         }          $http.post("/tgnewui/profile/home/uploadprofilepic", formdata, {             withcredentials: true,             headers: { 'content-type': undefined },             transformrequest: angular.identity         }).success(function (data) {             if (data.success.tolowercase() == "true") {                 $scope.profiledetails.profilepicdataurl = data.profilepicdataurl;                 ngdialog.closeall();             }             else {                 switch (data.success) {                     case "false":                     case "-1":                         $scope.profilepicerror = $scope.dynamicstrings.errormessage_erroruploadingfile;                         break;                     case "-2":                         $scope.profilepicerror = $scope.dynamicstrings.picture_filesizeexceed;                         break;                     case "-3":                         $scope.profilepicerror = $scope.dynamicstrings.profilepic_unsupportedfiletype;                         break;                     case "-4":                         $scope.profilepicerror = $scope.dynamicstrings.errormessage_invalidprofilepicname;                         break;                 }             }         });     },

mvc controller method found controller gets httppostedfilebase content length 0 .

 [httppost]     public actionresult uploadprofilepic(int clientid, int siteid, string sessionid, string iconid)     {         httppostedfilebase hpf = null;         uploadprofilepicrequest request = new uploadprofilepicrequest();         request.clientid = clientid;         request.siteid = siteid;         request.sessionid = sessionid;          myactionresponse response = new myactionresponse();         string erroruploading = string.empty;         response.success = "-1";         var validextensions = new list<string> { "png", "gif", "jpg", "jpeg", "bmp", "tif" };         try         {              if (request.files.count > 0)             {                 hpf = request.files[0] httppostedfilebase;             }             if (hpf != null && hpf.contentlength > 0)             {                 string encodedpicture = string.empty;                 request.filesize = hpf.contentlength.tostring();                 binaryreader br = new binaryreader(hpf.inputstream);            }         }         catch (system.exception)         {         }         return this.json(response);     }





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