Built-in helper to parse User.Identity.Name into Domain\Username

Question

Is there any built-in utility or helper to parse HttpContext.Current.User.Identity.Name, e.g. domain\user to get separately domain name if exists and user?

Or is there any other class to do so?

I understand that it's very easy to call String.Split("\") but just interesting

It's the simple questions we always forget to ask ourselves. Will look forward to any useful answers to this question. — Torbjørn, Dec 08 '08 at 13:25

score 70 · Accepted Answer · edited Nov 29 '11 at 16:45

70

This is better (easier to use, no opportunity of NullReferenceExcpetion and conforms MS coding guidelines about treating empty and null string equally):

public static class Extensions
{
    public static string GetDomain(this IIdentity identity)
    {
        string s = identity.Name;
        int stop = s.IndexOf("\\");
        return (stop > -1) ?  s.Substring(0, stop) : string.Empty;
    }

    public static string GetLogin(this IIdentity identity)
    {
        string s = identity.Name;
        int stop = s.IndexOf("\\");
        return (stop > -1) ? s.Substring(stop + 1, s.Length - stop - 1) : string.Empty;
    }
}

Usage:

IIdentity id = HttpContext.Current.User.Identity;
id.GetLogin();
id.GetDomain();

This requires C# 3.0 compiler (or newer) and doesn't require 3.0 .Net for working after compilation.

edited Nov 29 '11 at 16:45

SliverNinja - MSFT

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answered Dec 08 '08 at 16:53

Aen Sidhe

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8

Your return statement in `GetLogin` can be simplified to `return s.Substring(stop + 1);` – Sam Harwell Aug 01 '13 at 12:31
1

What if the username has multiple back-slashes? What if the user wants to use the UPN format of user@domain.com? I ended up using the Win32 function CredUIParseUserName. See http://www.pinvoke.net/default.aspx/credui.creduiparseusername – Ed Greaves Oct 04 '17 at 15:57

score 13 · Answer 2 · answered Jun 08 '11 at 21:19

13

System.Environment.UserDomainName gives you the domain name only

Similarly, System.Environment.UserName gives you the user name only

answered Jun 08 '11 at 21:19

StarCub

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> System.Environment.UserDomainName` gives you the domain name only > > Similarly, `System.Environment.UserName` gives you the user name only This will not work on ASP.NET – Simon Bastian Aug 23 '11 at 08:03
I think it works if you use authentication=Windows and impersonation=true. See - http://stackoverflow.com/questions/8841816/system-web-httpcontext-current-user-identity-name-vs-system-environment-username – FMFF Jan 12 '12 at 21:40

score 7 · Answer 3 · edited Aug 01 '13 at 16:21

7

var components = User.Identity.Name.Split('\\');

var userName = components.Last() 

var domainName = components.Reverse().Skip(1).FirstOrDefault()

edited Aug 01 '13 at 16:21

abatishchev

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answered Feb 27 '13 at 16:30

Gruff Bunny

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Omar · Answer 4 · 2010-02-01T22:24:09.013

You guys might also consider parsing a string input like "user@company.com", or "user@domain".

This is what I'm currently doing:
If string contains '\' then split string at '\' and extract username and domain
Else If string contains '@' then split string at '@' and extract username and domain
Else treat string as username without a domain

I'm still hunting for a better solution in the case where the input string isn't in an easily predicted format, i.e. "domain\user@domain". I'm thinking RegEx...

Update: I stand corrected. My answer is a bit of out context, it refers to the general case of parsing username and domains out of user input, like in user login/logon prompt. Hope it still helps someone.

Need an elegant solution for this. I agree. One answer to the domain\user part is this one: http://stackoverflow.com/a/185716/481656 — DoomerDGR8, Jun 06 '12 at 08:51

score 4 · Answer 5 · edited Oct 03 '14 at 15:20

4

I think No too, because I asked myself the same question the other day :D

You can try:

public static string GetDomain(string s)
{
    int stop = s.IndexOf("\\");
    return (stop > -1) ? s.Substring(0, stop + 1) : null;
}

public static string GetLogin(string s)
{
    int stop = s.IndexOf("\\");
    return (stop > -1) ? s.Substring(stop + 1, s.Length - stop - 1) : null;
}

edited Oct 03 '14 at 15:20

Unihedron

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answered Dec 08 '08 at 14:09

Ian G

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score 1 · Answer 6 · answered Apr 03 '14 at 11:16

1

Although not a .NET built-in, one can always P/Invoke to CredUIParseUserName. Here's a example of how to use it in .NET.

PS: It doesn't seem to handle the "dot", as in ".\username".

answered Apr 03 '14 at 11:16

Mihai

53
4

score 1 · Answer 7 · answered Dec 08 '08 at 13:27

1

I don't think so, because System.Security.Principal.WindowsIdentity doesn't contain such members.

answered Dec 08 '08 at 13:27

Aen Sidhe

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Adam Cooper · Answer 8 · 2013-08-01T13:19:10.123

0

Seems like a problem made to be solved by regular expressions:

public static class UserExtensions
{
    public static string GetDomain(this IIdentity identity)
    {
        Regex.Match(identity.Name, ".*\\\\").ToString()
    }

    public static string GetLogin(this IIdentity identity)
    {
        return Regex.Replace(identity.Name, ".*\\\\", "");
    }
}

edited Aug 01 '13 at 13:19

answered Aug 01 '13 at 12:14

Adam Cooper

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Isn't using regex an overkill here when simple string manipulating may be used instead? – abatishchev Aug 01 '13 at 16:24
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Sounds like: I have a problem. Let's use regex. Now I have two problems :) – abatishchev Aug 01 '13 at 16:25
A regex solves the problem in one simple line. They're not the right tool for every job but I think in this case the regex solution is more elegant. – Adam Cooper Aug 01 '13 at 16:55

Built-in helper to parse User.Identity.Name into Domain\Username

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