爲什麼我的嵌套CustomerViewModel爲空？

我設法註冊一個applicationuser，現在我想提出一個HTTP GET請求，它在View中顯示當前登錄用戶的賬戶詳細信息。爲什麼我的嵌套CustomerViewModel爲空？

但是，當我運行應用程序並轉到「MyPages」視圖時，出現異常，表明嵌套的CustomerViewModel爲空。我完全不知道爲什麼，但出於某種原因。

這是HomeController.cs的ActionResult的

public ActionResult MyPages() 
{ 
    string userId = User.Identity.GetUserId(); 
    var currentUser = _userRepository.GetById(userId); 
    var customer = _customerRepository.GetById(currentUser.Customer.Id); 

    var userViewModel = new UserViewModel(); 
    userViewModel.Id = currentUser.Id; 
    userViewModel.UserName = currentUser.UserName; 

    //This is where the exception occurs. Apperantly CustomerViewModel is null      
    userViewModel.CustomerViewModel.Id = customer.Id; 
    userViewModel.CustomerViewModel.FirstName = customer.FirstName; 
    userViewModel.CustomerViewModel.LastName = customer.LastName; 
    userViewModel.CustomerViewModel.Email = customer.Email;   

    return View(userViewModel); 
}

這是UserViewModel

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.Security; 
using Microsoft.AspNet.Identity.EntityFramework; 

namespace GUI.Models 
{ 
    public class UserViewModel 
    { 
     public virtual string Id { get; set; } 
     public virtual string UserName { get; set; } 
     public virtual string PasswordHash { get; set; } 
     public virtual string SecurityStamp { get; set; } 

     public virtual ICollection<IdentityUserRole> Roles { get; set; } 
     public virtual ICollection<IdentityUserClaim> Claims { get; set; } 
     public virtual ICollection<IdentityUserLogin> Logins { get; set; } 

     public CustomerViewModel CustomerViewModel { get; set; } 
    } 
}

這是CustomerViewModel：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.ComponentModel.DataAnnotations; 
using ClassLibrary.Entities; 

namespace GUI.Models 
{ 
    public class CustomerViewModel 
    { 
     public Guid Id { get; set; } 

     [Required] 
     [Display(Name = "First Name")] 
     public string FirstName { get; set; } 

     [Required] 
     [Display(Name = "Last Name")] 
     public string LastName { get; set; } 

     [Display(Name = "Email Adress")] 
     [Required(ErrorMessage = "Email address is required")] 
     [EmailAddress(ErrorMessage = "Invalid Email Address")] 
     public string Email { get; set; } 

     public List<InvoiceViewModel> InvoiceViewModels { get; set; } 
     public List<AddressViewModel> AdressViewModels { get; set; } 

     public AddressViewModel AdressViewModel { get; set; } 

     public virtual ICollection<Invoice> Invoice { get; set; } 
     public virtual ICollection<Adress> Adress { get; set; } 
    } 
}

似乎是什麼問題這裏？

來源

2014-04-22 Assassin87

CustomerViewModel是更換您的UserViewModel Model類null，你必須聲明像 ** var userViewModel = new UserViewModel（）; ** –

我可能在代碼中丟失了某些東西，但它看起來並不像CustomerViewModel爲userViewModel.CustomerViewModel實例化。

你可以節省一些麻煩，讓UserViewModel爲您創建一個新的實例：

public class UserViewModel 
{ 
    public UserViewModel() 
    { 
     CustomerViewModel = new CustomerViewModel(); 
    } 

    public CustomerViewModel CustomerViewModel { get; set; } 
}

來源

2014-04-22 07:35:41

這確實有竅門。謝謝！ – Assassin87

請與下面的代碼

公共類UserViewModel

{ 

    public virtual string Id { get; set; } 
    public virtual string UserName { get; set; } 
    public virtual string PasswordHash { get; set; } 
    public virtual string SecurityStamp { get; set; } 
    public UserViewModel() 
    { 
     CustomerViewModel = new CustomerViewModel(); 
    } 

    public CustomerViewModel CustomerViewModel { get; set; } 
}

來源

2014-04-22 07:41:12 Harikant

爲什麼我的嵌套CustomerViewModel爲空？

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