Built-in helper to parse User.Identity.Name into DomainUsername

Is there any built-in utility or helper to parse HttpContext.Current.User.Identity.Name, e.g. domainuser 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

Answers:

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Method 1

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.

Method 2

System.Environment.UserDomainName gives you the domain name only

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

Method 3

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

var userName = components.Last() 

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

Method 4

You guys might also consider parsing a string input like “[email protected]”, or “[email protected]”.

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[email protected]”. 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.

Method 5

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

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;
}

Method 6

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

Method 7

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”.

Method 8

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, ".*\\", "");
    }
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0