在控制器ASP API中添加新方法后使用方法失败

Question

首先，我在控制器api中有一个方法来向数据库添加记录。低于我的方法：

   [HttpPost]
    public Response<UserView> AddUser(UserView user)
    {
        EntityFirstApp.User mappedUser = Mapper.Map <EntityFirstApp.User>(user); 

        var entityUser = this._userService.AddUser(mappedUser);

        UserView userView = Mapper.Map<UserView>(entityUser);

        //// build response
        var response = new Response<UserView> { Model = userView };

        response.Messages.Add(new Message
        {
            MessageType = MessageType.Success,
            Value = "Success"
        });

        return response;
    }

在添加另一种删除记录的方法之前，该方法很有效。低于我的其他方法

  [HttpPost]
    public Response<UserView> DeleteUser(Int64 Id)
    {
        var entityUser = this._userService.GetUserById(Id);
        this._userService.DeleteUser(Id);

       UserView userView = Mapper.Map<UserView>(entityUser);

      //// build response
        var response = new Response<UserView> { Model = userView };

       response.Messages.Add(new Message
       {
           MessageType = MessageType.Success,
           Value = "Success"
       });

        return response;
    }

添加 DeleteUser 方法后，我再也无法使用AddUser方法了。我得到无法加载资源：服务器在浏览器控制台中响应状态为400（错误请求）。在前面我使用angularjs来使用该方法。低于我前面的代码。

    userModule.service('userService', userService);

userService.$inject = ['$http', '$q', 'commonEnum'];

function userService($http, $q, commonEnum) {

    var userService = {
        getAllUser: getAllUser,
        addUser: addUser,
        deleteUser : deleteUser
    }

    return userService;

    function getAllUser() {
        var deferred = $q.defer();
        $http({
            method: commonEnum.ajaxMethod.get,
            url: commonEnum.baseApiUrl.base + commonEnum.webApiUrl.getAllUser,
        })
            .success(onSuccess)
            .error(onError);

        function onSuccess(data) {
            deferred.resolve(data);
        }

        function onError() {
            deferred.reject();
        }

        return deferred.promise;
    }

    function addUser(user) {

        var deferred = $q.defer();
        $http({
            method: commonEnum.ajaxMethod.post,
            url: commonEnum.baseApiUrl.base + commonEnum.webApiUrl.addUser,
            data: user
        })
            .success(onSuccess)
            .error(onError);

        function onSuccess(data) {
            deferred.resolve(data);
        }

        function onError() {
            deferred.reject();
        }

        return deferred.promise;
    }

    function deleteUser(userId) {
        var parameters = {
            Id: userId
        }
        var deferred = $q.defer();
        $http({
            method: commonEnum.ajaxMethod.post,
            url: commonEnum.baseApiUrl.base + commonEnum.webApiUrl.deleteUser,
            params: parameters
        })
            .success(onSuccess)
            .error(onError);

        function onSuccess(data) {
            deferred.resolve(data);
        }

        function onError() {
            deferred.reject();
        }

        return deferred.promise;
    }
}

我仍然无法弄明白为什么。任何帮助将不胜感激。感谢。