Wcf Service使用Angular Js应用程序抛出Null Referance异常

时间:2017-09-24 00:24:01

标签: javascript c# angularjs wcf ado.net

我正在将Wcf服务用于Angular JS Application。我使用类库项目创建了wcf服务。我把它托管到Service.svc文件中。当我点击提交按钮时,我在文本框中输入了所需信息,显示以下错误。

System.NullReferanceException: Object reference not set an instance of an object.
Angular JS application showing following error ..

POST http://localhost:52098/HalifaxIISService.svc/RegisterUser 400 (Bad Request)

这是界面。

 [OperationContract]
        [WebInvoke(Method = "POST",
        RequestFormat = WebMessageFormat.Json,
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.WrappedRequest,
         UriTemplate = "/RegisterUser")]
        bool RegisterUser(UserLogin UserLogin);

这是接口的实现..

 public bool RegisterUser(UserLogin UserLogin)
        {
            string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            // SqlConnection is in System.Data.SqlClient namespace
            using (SqlConnection con = new SqlConnection(CS))
            {
                SqlCommand cmd = new SqlCommand("spRegisterUser", con);
                cmd.CommandType = CommandType.StoredProcedure;

                SqlParameter username = new SqlParameter("@Username", UserLogin.Username);
                // FormsAuthentication calss is in System.Web.Security namespace
                string encryptedPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(UserLogin.Password, "SHA1");
                SqlParameter password = new SqlParameter("@Password", encryptedPassword);
                SqlParameter email = new SqlParameter("@Email", UserLogin.Email);

                cmd.Parameters.Add(username);
                cmd.Parameters.Add(password);
                cmd.Parameters.Add(email);

                con.Open();
                int ReturnCode = (int)cmd.ExecuteScalar();
                if (ReturnCode == -1)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
        }

这是Script.Js文件代码..

/// <reference path="../angular.min.js" />  



var app = angular.module("WebClientModule", [])

    .controller('Web_Client_Controller', ["$scope", 'myService', function ($scope, myService) {

        $scope.OperType = 1;
        //1 Mean New Entry  

        //To Clear all input controls.  
        function ClearModels() {
            $scope.OperType = 1;
            $scope.Username = "";
            $scope.Password = "";
            $scopr.Email = "";

        }


        $scope.createuser = function () {
            var User = {
                Username: $scope.Username,
                Password: $scope.Password,
                Email: $scope.Email

            };
            if ($scope.OperType === 1) {
                var promisePost = myService.post(User);
                promisePost.then(function (pl) {
                    $scope.User_Id = pl.data.User_Id;
                    window.location.href = "/Login/Index";

                    ClearModels();
                }, function (err) {
                    $scope.msg = "Password Incorrect !";
                    console.log("Some error Occured" + err);
                });
            }
        }
    }]);

app.service("myService", function ($http) {
    //Create new record  
    this.post = function (User) {
        var request = $http({
            method: "post",
            url: "http://localhost:52098/HalifaxIISService.svc/RegisterUser",
            data: User
        });
        return request;
    }

})

以下是调试模式的屏幕截图.. Click here to see the out put

以下是点击提交按钮的屏幕截图。 Click here to see the result

我不知道为什么会收到此错误。任何帮助都将受到高度赞赏。

1 个答案:

答案 0 :(得分:0)

null引用表示UserLogin对象为null。我先查看以下内容。

确保UserLogin是与数据成员对应的用户名,密码和电子邮件值的数据合同。在post请求中,将用户对象串起来。

data : JSON.stringify(User)

检查以下链接以获取更多信息,我会确保$ http正在设置正确的内容类型。

Javascript Array as WCF Webservice Parameter

编辑:我建议使用与类名称不同的值来命名变量。我不确定c#如何处理它。