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NullReferenceException when trying to pass a nested ViewModel to a Partial


You should initialize properties LoginViewModel and RegisterViewModel in the view models constructor

public class LoginAndRegisterViewModel
{
  public LoginAndRegisterViewModel()
  {
    LoginViewModel = new LoginViewModel();
    RegisterViewModel  = new RegisterViewModel ();
  }
  public LoginViewModel LoginViewModel{ get; set;
}
  public RegisterViewModel RegisterViewModel{ get;
set; }
}

and in the GET method, pass a new instance of the view model

public ActionResult Register()
{
  var model = new LoginAndRegisterViewModel();
  return View("Login", model);
}

and to ensure you model properties post back, pass the model to the partials

@Html.Partial("_LoginPartial", Model)

and change the partial to use LoginAndRegisterViewModel

@model Models.LoginAndRegisterViewModel
@using (Html.BeginForm("Login", "Account", new
{ReturnUrl = ViewBag.ReturnUrl}, FormMethod.Post))
{
  @Html.TextBoxFor(m => m.LoginViewModel.Email)
  @Html.PasswordFor(m =>
m.LoginViewModel.Password)
}

This ensures the that the controls are bound to the view model and generate the correct name attributes

<input type="text:
name="LoginViewModel.Email"..>

whereas passing on a property of the model would have generated

<input type="text:
name="Email"..>

which would not bind to LoginAndRegisterViewModel on post back and all properties would have been null


Categories : C#

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