CODEWITHSUNDEEP
c#asp.net.netresharper
Galina
Galina

Reputation: 558

HttpCookieCollection.Get(): Possible NullReferenceException

I see the ReSharper warning 'Possible NullReferenceException' on this code on second line:

var cookie = HttpContext.Current.Response.Cookies[CookieName];
cookie.Expires = DateTime.Now.AddDays(-1);

I checked HttpCookieCollection.Get() Method in MSDN and it says 'If the named cookie does not exist, this method creates a new cookie with that name.'. So it looks like NullReferenceException can't happen.

Is it just ReSharper bug or I missed something?

Upvotes: 5

Views: 458

Answers (2)

dan9298
dan9298

Reputation: 195

HttpCookieCollection.Get() can cause a null reference exception when it is not called from HttpResponse. So, ReSharper is technically correct that an exception could occur, although it will not happen in your code example. This so question shows an example where the null refence is possible.

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1039248

So it looks like NullReferenceException can't happen.

HttpContext.Current will be null if you execute this code outside of an ASP.NET context, like for example unit test, console or desktop application.

Upvotes: 2

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