獲取對象空refrence錯誤在登錄在asp.net MVC4

您好我想打一個登錄頁面爲會員和管理員還.. 在這裏，我也做了下面的代碼爲：獲取對象空refrence錯誤在登錄在asp.net MVC4

在型號：

public class Login 
     { 
      public int ID { get; set; } 
      public string UserName { get; set; } 
      public string Password { get; set; } 
     }

控制器

[HttpPost] 
public ActionResult Login(Login login, MemberDetailsWrapper memberlogin) 
{ 
    WrapperDB db = new WrapperDB(); 
    if (login.UserName.Equals("admin") &&login.Password.Equals("admin"))  //This will check for admin 
    { 
      returnRedirectToAction("Index"); 
    } 
    else if 
    (
     (login.UserName.Equals(memberlogin.objMemberBasicInformation.MemberFirstName.Equals(db.MemberBasicInformationDBS.Where(a =>a.MemberFirstName.Equals(a.MemberFirstName)))) 
     && (login.Password.Equals(memberlogin.objMemberBasicInformation.Qualification.Equals(db.MemberBasicInformationDBS.Where(a=>a.Qualification.Equals(a.Qualification)))))) 
    ) 
//This is For Member Login When Member Enter His FistName as a userName and Qualification as Password then Both credential match with the data present in db and return the respected person information 
    { 
      return RedirectToAction("Index","MemberDetails"); 
    }    
    ModelState.AddModelError("", "UserName And Password is Incorrect!!"); 
    return View(); 
}

鑑於：

<%@PageTitle=""Language="C#"Inherits="System.Web.Mvc.ViewPage<SHGManagementProject.Models.Login>"%> 

<h2>Login</h2> 
<%using (Html.BeginForm("Login", "Home", FormMethod.Post)) 
    { %> 
<%:Html.ValidationSummary(true) %> 
<fieldset> 
<legend>Log in Form</legend> 
<div> 
UserName 
<%:Html.TextBoxFor(m=>m.UserName) %> 
</div> 
<br/> 
<div> 
     Password 
<%:Html.PasswordFor(m=>m.Password) %> 
</div> 
<br/> 

<div> 
<inputid="SubmitLogin"type="submit"value="Login"/> 
<%--<%:Html.ActionLink("Are you Member? click Here!!","Login","Account") %>--%> 
</div> 
</fieldset> 
<%} %>

在執行時當我輸入用戶名，並通過爲管理員，然後它會成功執行..但是當我進入另一個用戶名和密碼，然後它拋出錯誤的NullReferenceException是未處理的用戶代碼

請告訴我的解決方案，並幫助我解決這個

來源

2014-05-13 SBSB

你是否已經通過調試器中的代碼來查看你在哪裏得到錯誤？ – christiandev

請參見[什麼是NullReferenceException，以及如何解決它？]（http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-doi-i-fix-it）。 'memberlogin.objMemberBasicInformation.MemberFirstName'最有可能是'null'。 – CodeCaster

指出導致錯誤的行 –

不知道在您的代碼引發錯誤，我假設的問題是下到memberLogin參數？

[HttpPost] 
public ActionResult Login(Login login, MemberDetailsWrapper memberlogin) 
{ 
    WrapperDB db = new WrapperDB(); 
    if (login.UserName.Equals("admin") &&login.Password.Equals("admin"))  //This will check for admin 
    { 
      returnRedirectToAction("Index"); 
    } 
    else if (memberlogin != null) 
    { 
     if 
     (
      (login.UserName.Equals(memberlogin.objMemberBasicInformation.MemberFirstName.Equals(db.MemberBasicInformationDBS.Where(a =>a.MemberFirstName.Equals(a.MemberFirstName)))) 
      && (login.Password.Equals(memberlogin.objMemberBasicInformation.Qualification.Equals(db.MemberBasicInformationDBS.Where(a=>a.Qualification.Equals(a.Qualification)))))) 
     ) 
     { 
      return RedirectToAction("Index","MemberDetails"); 
     } 
     else 
     { 
      ModelState.AddModelError("", "UserName And Password is Incorrect!!"); 
      return View(); 
     } 
    } 

    ModelState.AddModelError("", "UserName And Password is Incorrect!!"); 
    return View(); 
}

我添加了一個對證memberlogin來檢查它是否是null，仔細檢查括號不過，正如我剛纔輸入的那手。

來源

2014-05-13 10:42:32 christiandev

獲取對象空refrence錯誤在登錄在asp.net MVC4

回答

相關問題