Question

我有一个输入表单，要求用户输入其用户名和密码。一旦用户输入数据，然后单击提交按钮，jquery将运行一个post请求并将信息发送到控制器/ Home / RegisterUser，但所有即将到来的

在email2.dll中发生了'System.NullReferenceException'类型的异常，但未在用户代码中处理

附加信息：未将对象引用设置为对象的实例。

由于某种原因，ajax请求无法获取值email和密码，因为它们被设置为null，即email = null。

版本信息：Microsoft .NET Framework版本：4.0.30319; ASP.NET版本：4.0.30319.18446

WebForm1.aspx的

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="email2.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.10.2.js" type="text/javascript" ></script>
</head>
<body>
    <form id="form1" runat="server"  >
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
        </asp:ScriptManager>
        <fieldset style="width: 200px;">
            <asp:Label ID="lblEmailAddress" runat="server" Text="Email Address"></asp:Label>
            <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
            <asp:Label ID="lblPassword" runat="server" Text="Password"></asp:Label>
            <asp:TextBox ID="txtPassword" runat="server"></asp:TextBox>
        </fieldset>
        <div>
        </div>
        <asp:Button ID="btnCreateAccount" runat="server" Text="Signup" OnClientClick="Signup();return false;" />
    </div>

        <div id="postResult">?</div>

    </form>
</body>
</html>

// use  PageMethods. if want to use methods within WebForm1.apsx.cs

<%--<script type="text/javascript">
    function Signup() {
        var email = document.getElementById('<%=txtEmail.ClientID %>').value;
        var password = document.getElementById('<%=txtPassword.ClientID %>').value;

        PageMethods.RegisterUser(email, password, onSucess, onError);

        function onSucess(result) {
            alert(result);
        }

        function onError(result) {
            alert('Cannot process your request at the moment, please try later.');
        }
    }
</script>--%>

<%--<script type="text/javascript">


    var url = "/Home/RegisterUser";

    var email = document.getElementById('<%=txtEmail.ClientID %>').value;
    var password = document.getElementById('<%=txtPassword.ClientID %>').value;

    var f = $("form1");
    var url = f.attr("action");
    var formData = f.serialize();
    $.post(url, formData, function (data) {
        $("#postResult").html(data);
    });


</script>
--%>

<script type="text/javascript">


    var username = $("input#txtEmail").val();
    var password = $("input#txtPassword").val();


    $(document).ready(function () {

        $("#btnCreateAccount").click(function () {
            debugger;

            $.ajax({
                type: 'POST',
                url: 'Home/RegisterUser',
                data: { username: username, password: password },
                ContentType: 'application/Json',
                dataType: "json",
                success: function (data) {
                    alert("Register succesfully");
                    $("#postResult").html(data);
                },
                error: function () {
                    alert("Error while registration");

                }
            });
        });
    });




    </script>

HomeController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Script.Services;
//need this to run  [WebMethod]
using System.Web.Services;

namespace email2.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your application description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }


        [WebMethod]
        [AcceptVerbs(HttpVerbs.Post)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public ActionResult RegisterUser(string email, string password)
        {
            string result = "Congratulations!!! your account has been created.";
            if (email.Length == 0)//Zero length check
            {
                result = "Email Address cannot be blank";
            }
            else if (!email.Contains(".") || !email.Contains("@")) //some other basic checks
            {
                result = "Not a valid email address";
            }
            else if (!email.Contains(".") || !email.Contains("@")) //some other basic checks
            {
                result = "Not a valid email address";
            }

            else if (password.Length == 0)
            {
                result = "Password cannot be blank";
            }
            else if (password.Length < 5)
            {
                result = "Password canonot be less than 5 chars";
            }

            return Content(result);
        }



    }
}

Answer 1

应该是

public ActionResult RegisterUser(string email, string password) 
{
    string result = "Yeah!";
    //... some checks

    return Content(result);
}

而不是

public static string  RegisterUser(string email, string password) 
{
    //....
}

如果是static

，则无法找到您的操作

如何使用jquery验证电子邮件

1 个答案: