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Get the Long User Name of a Logged-in Account within C#

Posted on 2012-08-21
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Last Modified: 2012-08-23
I'm looking for a way to find the name of the user logged in and running a C# application.

I found that
string username = Environment.UserName;

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works to find the username: "jsmith".

What I want to find is a name in the format: "John Smith".
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Question by:bpatton_psr
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Dhaest earned 1500 total points
ID: 38319274
If you're using .Net 3.0 or higher, there's a lovely library that makes this practically write itself. System.DirectoryServices.AccountManagement has a UserPrincipal object that gets exactly what you are looking for and you don't have to mess with LDAP or drop to system calls to do it. Here's all it'd take:

WindowsPrincipal principal = (WindowsPrincipal)Thread.CurrentPrincipal; 
// or, if you're in Asp.Net with windows authentication you can use: /
/ WindowsPrincipal principal = (WindowsPrincipal)User; 
using (PrincipalContext pc = new PrincipalContext(ContextType.Domain)) 
{
     UserPrincipal up = UserPrincipal.FindByIdentity(pc, principal.Identity.Name);
     return up.DisplayName;
     // or return up.GivenName + " " + up.Surname;
 }
  

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Note: you don't actually need the principal if you already have the username, but if you're running under the users context, it's just as easy to pull it from there.

Source: http://stackoverflow.com/questions/3471635/get-first-name-last-name-of-logedin-windows-user
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Author Closing Comment

by:bpatton_psr
ID: 38326246
This is the code I ended up using:
UserPrincipal up = UserPrincipal.Current;
fullName = up.GivenName + up.Surname;

The most difficult thing I found was that you need to add a reference to the .NET package System.DirectoryServices.AccountManagement by right clicking on References and clicking Add Reference.
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