asp.net core error on int null

Marius Vasile

I want to be able to show data if an integer is not null. However, if is null I get error

@if (item.PTWSubsequent.PTWNoS != 0)
   {
     
       @Html.DisplayFor(model => item..PTWNoS)
     
   }

and code behind

PTWContentList = await _context.PTWContents.Include(s => s.PTWMain).Include(s => s.PTWSubsequent).Where(s => s.PTWMain.OrgID == orgid).ToListAsync();

I get the error that PTWNoS is null which I know is null. I just want to not show the div if is null

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

you gave plural names so I thought so. like it's a list of integers.

it's like we are trying to fetch a value from an empty list, so the compiler doesn't understand this and throws error.

Now is working, thank you Sachin. So both the model and int to be checked not null, just the value is not enough

Is not the list, is a value, an integer

sir, how a List can be 0? its count can be 0, not the list itself.

@if (item.PTWSubsequent.PTWNoS.Count()>0)
{
class="col-md-1">
class="form-control text-center btn-link" asp-page="/PTW/IsolationCertificate" asp-route-ptwid="@item.PTWId" asp-route-ptwsid="@item.PTWSId">@Html.DisplayFor(model => item..PTWNoS)

}