CODEWITHSUNDEEP
c#asp.net-mvclinqrazormodel
Aghnat Atqiya
Aghnat Atqiya

Reputation: 295

Cannot Use LINQ-Method In Razor View ASP.Net

I call a model in view.cshtml like this:

@model IEnumerable<Spiirit_Project.Models.Deliverable>

Then I use this LINQ-method in view.cshtml so:

@{ var a = Model.Where(p => p.deliverable_research_year_id == 169).Count(); }

When I run my project, there is error: "Value cannot be null. Parameter name: source".

my "Deliverable" Table is not null but I get this error. How to fix this error?

there is my controller:

public ActionResult CreateDeliverable(int? idResearch, int? idBaseline, int? idYear){
ViewBag.IdResearch = idResearch;
ViewBag.IdBaseline = idBaseline;
ViewBag.IdYear = idYear;
ViewBag.Year = db.Deliverable_Research_Years.Find(idYear);
ViewBag.Deliverable = db.Deliverables.ToList();

return View();
}

Upvotes: 1

Views: 1041

Answers (2)

Aghnat Atqiya
Aghnat Atqiya

Reputation: 295

@mjwills tell me in comment to pass in the model to the view. So I change my controller like this:

public ActionResult CreateDeliverable(int? idResearch, int? idBaseline, int? idYear){
ViewBag.IdResearch = idResearch;
ViewBag.IdBaseline = idBaseline;
ViewBag.IdYear = idYear;
ViewBag.Year = db.Deliverable_Research_Years.Find(idYear);

return View(db.Deliverables.ToList());
}

This is work correctly!

Upvotes: 3

Richard Schneider
Richard Schneider

Reputation: 35477

Try

@{ var a = Model?.Where(p => p.deliverable_research_year_id == 169).Count() ?? 0; }

This is assuming that deliverable_research_year_id is NOT a nullable type.

Upvotes: -2

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