Object reference not set to an instance of an object. with a non null object.

Question

Ok I'm having this problem that is driving me crazy, I'm doing a search for a website, and it works great on my machine but when I upload it to gearhost it just blow with this error :

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 43: @if (Model != null)
Line 44: {
Line 45: if (Model.Any())
Line 46: {

The error appear on Line 45, even though I'm sure I know its not null and its and IEnumerable.

My Model in razor is declared as follow:

@model IEnumerable<Posada>

And this does work if I send an empty search, but not when I use a string that returns rows or other that does not return any.

In my controller I just return a IEnumerable and use it as the model.

 IEnumerable<Posada> posadas = unitOfWork.PosadaRepository.Get(includeProperties: "Estado,Lugar")
                .Where(p => p.Nombre.ToLowerInvariant().Contains(query) ||
                            p.Estado.Nombre.ToLowerInvariant().Contains(query) ||
                            p.Lugar.Nombre.ToLowerInvariant().Contains(query))

                .OrderBy(p => p.Id)
                .Skip((page - 1)*pagingInfo.ItemsPerPage)
                .Take(pagingInfo.ItemsPerPage);

Model won't be null if you just set it to an IEnumerable, however, once you call Any(), all of your Where, OrderBy, and other LINQ methods will actually trigger. My thought is something in p you are dotting off of is null. — TyCobb
– TyCobb, Commented Jun 1, 2015 at 23:30
TyCobb you are right.. I knew it was a dumb mistake but really was not able to see it, thanks. — Luis Tellez
– Luis Tellez, Commented Jun 1, 2015 at 23:33

vmg · Accepted Answer · 2015-06-01 23:32:40Z

3

Seems like NullReferenceException happens when you enumerate IEnumerable (when you execute Any()). IEnumerable is not null, and then most likely one gets NullReferenceException:

p.Nombre.ToLowerInvariant()
p.Estado.Nombre.ToLowerInvariant()
p.Lugar.Nombre.ToLowerInvariant()
pagingInfo.ItemsPerPage

answered Jun 1, 2015 at 23:32

vmg

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Comments

marc_s · Accepted Answer · 2023-12-09 08:05:34Z

1

Remember IEnumerable<> only evaluates the query when it needs to, so as stated by the other answer, when you use Any(), your query gets evaluated and in that case either Estado or Lugar can be null.

Try something like:

(p.Estado != null && p.Estado.Nombre.ToLowerInvariant().Contains(query)) ||
(p.Lugar != null && p.Lugar.Nombre.ToLowerInvariant().Contains(query)))

edited Dec 9, 2023 at 8:05

marc_s

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answered Jun 1, 2015 at 23:41

Mequedoen

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1 Comment

user3165083 Over a year ago

is that called numbre uno which is presented at advertising?

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