User.Identity.Name throw Object reference not set to an instance

Question

I have this code

public UserProfile spUserProfileGet()
        {
            // this line throw : Object reference not set to an instance 
            var user = HttpContext.Current.User.Identity.Name;

            //...

        }

In my IIS Development setting, I have

Anonymous Authentication : Disabled
Windows Authentication : Enabled

And i am getting

Object reference not set to an instance

Why is that ? I am using this class in many projects before with no problem :/

The HttpContext.Current.User is NULL, but why ?

Possible duplicate of [What is a NullReferenceException, and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — DavidG, Sep 29 '16 at 09:01
Read the duplicate question, it tells you exactly how to figure that out. — DavidG, Sep 29 '16 at 09:06
@DavidG in this case generic advice on debugging null references is unlikely to help. If `User` is null it points to an issue with auth configuration. — Ant P, Sep 29 '16 at 09:07
Maybe, the cause is that I use it in `Application_BeginRequest()` method and there is no user object yet, I will inspect this — Muflix, Sep 29 '16 at 09:09

Muflix · Answer 1 · 2016-09-29T09:45:44.407

The problem was, that I called HttpContext.Current.User from global.asax Application_BeginRequest() which does not contain this object yet. Here is description of application lifecycle https://msdn.microsoft.com/en-us/library/ms178473.aspx and when I copy the code to the Application_PostAuthenticateRequest, It works now.

The problem that remains, is that Application_PostAuthenticateRequest is triggered twice.

User.Identity.Name throw Object reference not set to an instance

1 Answers1