javascript - angular and mvc 4 post File to server -


i have code :

javascript

$scope.savechanges = function (bl) {             console.log(bl)             $http.post('@url.action("savechangesbudgetline", "financialplanning")', {                 amount: bl.amount,                 month: bl.month.id_bulan,                 year: bl.year,                 newfile : bl.newfile             })             .then(function (resp) {                 console.log(resp)             })         }

c# :

[httppost]         public actionresult savechangesbudgetline(string amount, int month, int year, httppostedfilebase newfile)         {             return json(new { is_success = true, amount = amount, month = month, year = year, newfile = newfile });         }

newfile in javascript has value (console.log on client) :

newfile: file lastmodified: 1440754532970 lastmodifieddate: fri aug 28 2015 16:35:32 gmt+0700 (se asia standard time) name: "external.xlsx" size: 964223 type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" webkitrelativepath: ""

but on server newfile null.

why happend? how solve case? thanks


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