未将对象引用设置为对象的实例

Question

l当前正在使用Mvc 4应用程序。我的创建控制器如下。是

[HttpPost] 
[ValidateAntiForgeryToken()] 
public ActionResult Create(OfficeCreateModels model) 
{ 
    bool success = false; 
    string message = ""; 

    try 
    { 
     if (model.Name.IsNullOrWhitespace()) throw new Exception("Unable to create this Office Name. The Type cannot be blank or spaces."); 

     var company = models.Companies.FirstOrDefault(x => x.Id == model.CompanyId); 

     var officeExist = models.Offices.Any(x => x.Name.ToLower() == model.Name.ToLower() && x.CompanyId == model.CompanyId); 

     if (officeExist) 
       throw new Exception(string.Format("Company '{0}' already has an Office this named '{1}'" .FormatWith(company.Name.ToUpperCase(), model.Name.ToUpperCase()))); 

     Office office = new Office 
     { 
      Name = model.Name.ToUpperCase(), 
      Address1 = model.Address1.ToUpperCase(), 
      Address2 = model.Address2.ToUpperCase(), 
      Address3 = model.Address3.ToUpperCase(), 
      Telephone = model.Telephone.ToUpperCase(), 
      Fax = model.Fax.ToUpperCase(), 
      Email = model.Email.ToUpperCase(), 
      AccountType = model.AccountType.ToUpperCase() 
     }; 

     models.Offices.Add(office); 
     models.SaveChanges(); 

     success = true; 
     return RedirectToAction("Index"); 
     } 
    catch (Exception ex) 
    { 
     message = ex.Message; 
    } 

    return View(model); 
} 

我的ViewModels和DataModels分别

public class OfficeCreateModel 
{ 
    public Guid Id { get; set; } 
    public string Name { get; set; } 
    public string Address1 { get; set; } 
    public string Address2 { get; set; } 
    public string Address3 { get; set; } 
    public string Telephone { get; set; } 
    public string Fax { get; set; } 
    public string Email { get; set; } 

    public Guid CompanyId { get; set; } 
    public bool IsDeleted { get; set; } 
} 


//DataModels 
public class Office 
{ 
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] 
    public Guid Id { get; set; } 
    [MaxLength(50)] 
    public string Name { get; set; } 
    [MaxLength(100)] 
    public string Address1 { get; set; } 
    [MaxLength(100)] 
    public string Address2 { get; set; } 
    [MaxLength(100)] 
    public string Address3 { get; set; } 
    [MaxLength(20)] 
    public string Telephone { get; set; } 
    [MaxLength(20)] 
    public string Fax { get; set; } 
    [MaxLength(255)] 
    public string Email { get; set; } 

    public Guid CompanyId { get; set; } 
    public virtual Company Company { get; set; } 
    public virtual List<Agent> Agents { get; set; }  
} 

当我米运行进而以创建一个标识和名称的实体的实体的其余部分返回null代码如下。如果步骤结束，只有名称返回一个值，其余的将在ViewModel上返回一个空值。任何人都可以帮助我为什么viewModels是空值。先谢谢你。

Answer 1

1. 中有什么方法Create的签名OfficeCreateModels？您只发布了OfficeCreateModel课程。
2. 该方法的主体中的变量models是什么？在方法主体中，仅使用变量model（并在方法的签名中声明）。

我会看看你正在使用的变量。看起来你有一个NullReference异常，因为这些变量没有初始化。