How to get current user who s accessing an ASP NET application

Question

To get the current logged in user at the system I use this code   string opl   System Security Principal WindowsIdentity GetCurrent   Name ToString      I work on an ASP NET application where I need this information  So I ve put my application on a server and tried the code above  and I get  Network Service  in the string opl  I need to know the current user of the PC who accesses my ASP NET application

User · Answer

Using System Web HttpContext Current User Identity Name should work   Please check the IIS Site settings on the server that is hosting your site by doing the following    Go to IIS   Sites   Your Site   Authentication   Now check that Anonymous Access is Disabled  amp  Windows Authentication is Enabled    Now System Web HttpContext Current User Identity Name should return something like this   domain username

User · Answer

I ran in the same issue    This is what worked for me       Setting up Properties of Windows Authentication in IIS   NTLM has to be the topmost  Further Web config modifications  make sure you already have or add if these do not exist    lt system web gt      lt authentication mode  Windows    gt     lt identity impersonate  true   gt    lt  system web gt     lt  -- you need the following lines of code to bypass errors  concerning type of Application Pool  integrated pipeline or classic  -- gt    lt system webServer gt      lt validation validateIntegratedModeConfiguration  false   gt   lt  system webServer gt    See below a legit explanation for the two nodes  and   Difference between  lt system web gt  and  lt system webServer gt    And  of course   you get the username by     I am using the following to get the index of the separator      and remove the Domain name from the string int indexOfSlashChar   HttpContext Current User Identity Name IndexOf          loggedInWindowsUserName   HttpContext Current User Identity Name Substring indexOfSlashChar   1

User · Answer

The quick answer is User   System Web HttpContext Current User  Ensure your web config has the following authentication element     lt configuration gt       lt system web gt           lt authentication mode  Windows    gt           lt authorization gt               lt deny users      gt           lt  authorization gt       lt  system web gt   lt  configuration gt    Further Reading  Recipe  Enabling Windows Authentication within an Intranet ASP NET Web application

User · Answer

You can simply use a property of the page  And the interesting thing is that you can access that property anywhere in your code   Use this   HttpContext Current User Identity Name

User · Answer

Don t look too far   If you develop with ASP NET MVC  you simply have the user as a property of the Controller class  So in case you get lost in some models looking for the current user  try to step back and to get the relevant information in the controller   In the controller  just use   using Microsoft AspNet Identity            var userId   User Identity GetUserId            with userId as a string

User · Answer

The general consensus answer above seems to have have a compatibility issue with CORS support  In order to use the HttpContext Current User Identity Name attribute you must disable anonymous authentication in order to force Windows authentication to provide the authenticated user information  Unfortunately  I believe you must have anonymous authentication enabled in order to process the pre-flight OPTIONS request in a CORS scenario   You can get around this by leaving anonymous authentication enabled and using the HttpContext Current Request LogonUserIdentity attribute instead  This will return the authenticated user information  assuming you are in an intranet scenario  even with anonymous authentication enabled  The attribute returns a WindowsUser data structure and both are defined in the System Web namespace          using System Web          WindowsIdentity user          user    HttpContext Current Request LogonUserIdentity

User · Answer

The best practice is to check the Identity IsAuthenticated Property first and then get the usr UserName like this   string userName   string Empty   if  System Web HttpContext Current    null  amp  amp       System Web HttpContext Current User Identity IsAuthenticated        System Web Security MembershipUser usr   Membership GetUser        if  usr    null                  userName   usr UserName

User · Answer

If you re using membership you can do  Membership GetUser   Your code is returning the Windows account which is assigned with ASP NET  Additional Info Edit  You will want to include System Web Security using System Web Security

[c#] How to get current user who's accessing an ASP.NET application?

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