CODEWITHSUNDEEP
asp.net-mvcrazorviewbag
Luca Morelli
Luca Morelli

Reputation: 2560

check member existence in Mvc ViewBag

Sometimes I have to check the existence of a member inside the ViewBag from inside an Mvc View, to see if for any problem the action forgot to assign the member. Inside my Razor View I have:

@if(ViewBag.Utente.Ruolo.SysAdmin)

how can I check that ViewBag.Utente is defined?

Upvotes: 3

Views: 4919

Answers (4)

Jeyhun Rahimov
Jeyhun Rahimov

Reputation: 3787

You must check all objects are null or not. Utente, Utente.Ruolo and Utente.Ruolo.SysAdmin may be null:

@if (ViewBag.Utente != null)
{
  if (ViewBag.Utente.Ruolo != null)
  {
     if (!string.IsNullOrEmpty(ViewBag.Utente.Ruolo.SysAdmin))
     {
       //ViewBag.Utente.Ruolo.SysAdmin has value..you can use it 
     }  
  }
}

Upvotes: 4

Daniele
Daniele

Reputation: 1938

If you are using MVC4 you can use 

@if (ViewBag.Utente != null)

For previous versions take a look at those answers:

Checking to see if ViewBag has a property or not, to conditionally inject JavaScript

Upvotes: 2

ataravati
ataravati

Reputation: 9145

As simple as this:

@if (ViewBag.Utente != null)
{
   // some code
}

Upvotes: 3

yusuf
yusuf

Reputation: 1263

You can you use it;

@if (string.IsNullOrEmpty(ViewBag.Utente.Ruolo.SysAdmin))
{

}

But if you want to check your users are confirmed or not, I think it is not a good way..

Upvotes: 1

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