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PO.NET: How to look up a user in Active Directory?
 

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  1. PO.NET: How to look up a user in Active Directory?
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    <p>How do you look up a user in Active Directory?</p> <p>Some example usernames are:</p> <ul> <li>avatopia\ian</li> <li>avatar\ian</li> <li>ian@avatopia.com</li> <li>ian@avatopia.local</li> <li>avatopia.com\ian</li> </ul> <p>It's important to note that i don't know the name of the domain, <a href="https://stackoverflow.com/questions/192366/how-to-grab-ad-credentials-from-client-machine-in-a-web-application#192414">and i shouldn't be hard-coding it</a>.</p> <p>There is some <a href="https://stackoverflow.com/questions/192366/how-to-grab-ad-credentials-from-client-machine-in-a-web-application">sample code on stack-overflow</a> that fails. </p> <pre><code>using System.DirectoryServices; /// &lt;summary&gt; /// Gets the email address, if defined, of a user from Active Directory. /// &lt;/summary&gt; /// &lt;param name="userid"&gt;The userid of the user in question. Make /// sure the domain has been stripped first!&lt;/param&gt; /// &lt;returns&gt;A string containing the user's email address, or null /// if one was not defined or found.&lt;/returns&gt; public static string GetEmail(string userid) { DirectorySearcher searcher; SearchResult result; string email; // Check first if there is a slash in the userid // If there is, domain has not been stripped if (!userid.Contains("\\")) { searcher = new DirectorySearcher(); searcher.Filter = String.Format("(SAMAccountName={0})", userid); searcher.PropertiesToLoad.Add("mail"); result = searcher.FindOne(); if (result != null) { email = result.Properties["mail"][0].ToString(); } } return email; } </code></pre> <p>It specifically ensures that you didn't pass a full username. e.g. </p> <pre><code>Bad: avatopia\ian Bad: avatar\ian Good: ian Good: ian </code></pre> <p>Because you are not allowed to pass the domain, it can't differentiate between the two users</p> <pre><code>ian ian </code></pre> <p>Another guy has <a href="https://stackoverflow.com/questions/161398/finding-a-user-in-active-directory-with-the-login-name">the same question</a> on sackoverflow, but the accepted answer says that you must </p> <blockquote> <p>first locate the naming context for the required domain</p> </blockquote> <p>i <a href="https://stackoverflow.com/search?q=naming+context+active+directory">don't know</a> what a "naming context" is, and i don't know what the "required domain" is. i'd really rather not write a regular expression to try to parse usernames into domain names and account names, e.g. </p> <pre><code>domain.something\user-name </code></pre> <p>into</p> <pre><code>domain.something user-name </code></pre> <p>because i know there will be some edge case that i'll get wrong. i want the proper, intended, method of looking up a user in active directory.</p> <p>There's a nice page on CodeProject <a href="http://www.codeproject.com/KB/system/everythingInAD.aspx" rel="nofollow noreferrer">How to do almost everything in Active Directory</a>, but you can't lookup a user's information by username</p> <p>i would hope that i can give my domain controller (<a href="http://weblogs.asp.net/steveschofield/archive/2004/04/28/121857.aspx" rel="nofollow noreferrer">whoever it is, where ever it is, whatever it's called</a>) a username, and it will figure out which domain that user belongs to, talk to that domain controller, and get the work done.</p>
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