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I am trying to save data which pulls a list of a Ienumerable, however while always saving from the error below. When consulting the database, the data were saved correcting, but always give the Exception, already debbuguei and did not identify the error.
An unhandled exception occurred while processing the request.
NullReferenceException: Object reference not set to an instance of an object.
AspNetCore.Views_Address_CreateOrEdit.<ExecuteAsync>b__19_0() in CreateOrEdit.cshtml, line 49
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NullReferenceException: Object reference not set to an instance of an object.
AspNetCore.Views_Address_CreateOrEdit.<ExecuteAsync>b__19_0() in CreateOrEdit.cshtml
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<select class="form-control" asp-for="State" asp-items="@(new SelectList(Model.States,"Id", "State") )"></select>
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperExecutionContext.GetChildContentAsync(bool useCachedResult, HtmlEncoder encoder)
Microsoft.AspNetCore.Mvc.TagHelpers.RenderAtEndOfFormTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.RunAsync(TagHelperExecutionContext executionContext)
AspNetCore.Views_Address_CreateOrEdit.ExecuteAsync() in CreateOrEdit.cshtml
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Layout = "~/Views/Shared/_Layout.cshtml";
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, bool invokeViewStarts)
Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)
Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ActionContext actionContext, IView view, ViewDataDictionary viewData, ITempDataDictionary tempData, string contentType, Nullable<int> statusCode)
This is my Viewmodel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace AgendaWeb.ViewsModels
{
public class AddressViewModel
{
public int Id { get; set; }
public string Number { get; set; }
public string Complement { get; set; }
public string Street { get; set; }
public string Neighborhoods { get; set; }
public string City { get; set; }
public string State { get; set; }
public int CityId { get; set; }
public IEnumerable<CitiesViewModel> Cities { get; set; }
public IEnumerable<StatesViewModel> States { get; set; }
public IEnumerable<CountriesViewModel> Countries { get; set; }
}
public class CitiesViewModel
{
public int Id { get; set; }
public string City { get; set; }
public int StateId { get; set; }
}
public class StatesViewModel
{
public int Id { get; set; }
public string State { get; set; }
public string UF { get; set; }
public int CountryId { get; set; }
}
public class CountriesViewModel
{
public int Id { get; set; }
public string Country { get; set; }
public string Initials { get; set; }
}
}
This my View
<div class="form-wrapper">
<div class="col-md-12">
<form id="form" class="form-horizontal" asp-action="CreateOrEdit" asp-controller="Address" asp-anti-forgery>
<input type="hidden" class="form-control" asp-for="Id" />
<div class="form-group">
<label class="col-md-12 control-label">Endereço</label>
<div class="col-md-8">
<input type="text" class="form-control" asp-for="Street" />
</div>
</div>
<div class="form-group">
<label class="col-md-12 control-label">Número</label>
<div class="col-md-8">
<input type="text" class="form-control" asp-for="Number" />
</div>
</div>
<div class="form-group">
<label class="col-md-12 control-label">Complemento</label>
<div class="col-md-8">
<input type="text" class="form-control" asp-for="Complement" />
</div>
</div>
<div class="form-group">
<label class="col-md-12 control-label">Bairro</label>
<div class="col-md-8">
<input type="text" class="form-control" asp-for="Neighborhoods" />
</div>
</div>
<div class="form-group">
<label class="col-md-12 control-label">Cidade</label>
<div class="col-md-8">
<select class="form-control" asp-for="CityId" asp-items="@(new SelectList(Model.Cities,"Id", "City") )"></select>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-8">
<button class="btn btn-success">Salvar</button>
</div>
</div>
</form>
</div>
</div>
And this controller of mine
public class AddressController : Controller
{
private readonly AddressStorer _addressStorer;
private readonly UserStorer _userStorer;
private readonly CitiesStorer _citiesStorer;
private readonly StatesStorer _statesStorer;
private readonly CountriesStorer _countriesStorer;
private readonly IRepository<User> _userRepository;
private readonly IRepository<Address> _addressRepository;
private readonly IRepository<Cities> _citiesRepository;
private readonly IRepository<States> _statesRepository;
private readonly IRepository<Countries> _countriesRepository;
public AddressController(UserStorer userStorer,
AddressStorer addressStorer,
CitiesStorer citiesStorer,
StatesStorer statesStorer,
CountriesStorer countriesStorer,
IRepository<User> userRepository,
IRepository<Address> addressRepository,
IRepository<Cities> citiesRepository,
IRepository<States> statesRepository,
IRepository<Countries> countriesRepository)
{
_addressStorer = addressStorer;
_userStorer = userStorer;
_citiesStorer = citiesStorer;
_statesStorer = statesStorer;
_countriesStorer = countriesStorer;
_userRepository = userRepository;
_addressRepository = addressRepository;
_citiesRepository = citiesRepository;
_statesRepository = statesRepository;
_countriesRepository = countriesRepository;
}
// GET: Address
public IActionResult Index()
{
return View();
}
// GET: Address/Details/5
public IActionResult Details(int id)
{
return View();
}
// GET: Address/Create
public IActionResult CreateOrEdit(int id)
{
var viewModel = new AddressViewModel();
//var statesViewModel = new StatesViewModel();
//var citiesViewModel = new CitiesViewModel();
//var countriesViewModel = new CountriesViewModel();
var states = _statesRepository.All();
viewModel.States = states.Any()
? states.Select(s => new StatesViewModel { Id = s.Id, State = s.State, UF = s.UF, CountryId = s.Country.Id })
: new List<StatesViewModel>();
var countries = _countriesRepository.All();
viewModel.Countries = countries.Any()
? countries.Select(c => new CountriesViewModel { Id = c.Id, Country = c.Country, Initials = c.Initials })
: new List<CountriesViewModel>();
var cities = _citiesRepository.All();
viewModel.Cities = cities.Any()
? cities.Select(c => new CitiesViewModel { Id = c.Id, City = c.City, StateId = c.State.Id})
: new List<CitiesViewModel>();
if (id > 0)
{
var address = _addressRepository.GetById(id);
var state = _statesRepository.GetById(id);
var city = _citiesRepository.GetById(id);
viewModel.Id = address.Id;
viewModel.Street = address.Street;
viewModel.Number = address.Number;
viewModel.Complement = address.Complement;
viewModel.Neighborhoods = address.Neighborhoods;
viewModel.CityId = address.City.Id;
}
return View(viewModel);
}
// POST: Address/Create
[HttpPost]
public IActionResult CreateOrEdit(AddressViewModel viewModel)
{
// TODO: Add insert logic here
_addressStorer.Storer(viewModel.Id, viewModel.Street, viewModel.Number, viewModel.Complement, viewModel.Neighborhoods, viewModel.CityId);
return View();
}