[英]Object reference not set to an instance of an object
我目前正在研究Mvc 4应用程序。 我的创建控制器如下。
[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分别如下
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; }
}
当我运行代码时,它将继续创建Id和Name实体,其余实体返回null。 如果l结束,则仅Name返回一个值,其余返回ViewModels上的null。 谁能帮助我为什么viewModels为null。 先感谢您。
Create
方法的签名中的OfficeCreateModels
是什么? 您只发布了OfficeCreateModel
类。 models
是什么? 在方法主体中,仅使用变量model
(并在方法签名中声明)。 我将看看您使用的变量。 由于未初始化这些变量,因此您似乎具有NullReference异常。
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