angularJS的$http.post请求，.net后台接收不到参数值的解决方案

JS通用部分
  var shoppingCartModule =angular.module('starter', ['ionic'], function ($httpProvider) {
    // Use x-www-form-urlencoded Content-Type
    $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';

    /**
     * The workhorse; converts an object to x-www-form-urlencoded serialization.
     * @param {Object} obj
     * @return {String}
     */
    var param = function (obj) {
        var query = '', name, value, fullSubName, subName, subValue, innerObj, i;

        for (name in obj) {
            value = obj[name];

            if (value instanceof Array) {
                for (i = 0; i < value.length; ++i) {
                    subValue = value[i];
                    fullSubName = name + '[' + i + ']';
                    innerObj = {};
                    innerObj[fullSubName] = subValue;
                    query += param(innerObj) + '&';
                }
            }
            else if (value instanceof Object) {
                for (subName in value) {
                    subValue = value[subName];
                    fullSubName = name + '[' + subName + ']';
                    innerObj = {};
                    innerObj[fullSubName] = subValue;
                    query += param(innerObj) + '&';
                }
            }
            else if (value !== undefined && value !== null)
                query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
        }

        return query.length ? query.substr(0, query.length - 1) : query;
    };

    // Override $http service's default transformRequest
    $httpProvider.defaults.transformRequest = [function (data) {
        return angular.isObject(data) && String(data) !== '[object File]' ? param(data) : data;
    }];
});

JS调用部分
  shoppingCartModule.controller("infoctrl", function ($scope, $http) {
　　 var data = {
                    good_id: '@Model.id',
                    quantity: $scope.number,
                    attr: ""
                };
                $http.post('/WebApp/Cart/Add', data).success(function (responseData) {
                    $scope.addbuttonddisabled = false;

                });
　　})