How Can I Retrieve User Information (Name and Username) from Active Directory?

Retrieving User Information from Active Directory

To gather a list of users from Active Directory along with their corresponding usernames, first and last names, consider the following approach:

Understanding Active Directory Structure

Active Directory organizes data hierarchically, with containers and objects identified by distinguished names. Understanding this structure is crucial before performing queries.

LDAP Queries and PrincipalSearcher

Active Directory is a LDAP server, and LDAP queries can be utilized to retrieve information. For user-specific queries, the PrincipalSearcher class from System.DirectoryServices.AccountManagement is recommended.

Sample Code for Retrieval

The following code sample demonstrates how to retrieve user information using PrincipalSearcher:

using (var context = new PrincipalContext(ContextType.Domain, "yourdomain.com"))
{
    using (var searcher = new PrincipalSearcher(new UserPrincipal(context)))
    {
        foreach (var result in searcher.FindAll())
        {
            DirectoryEntry de = result.GetUnderlyingObject() as DirectoryEntry;
            Console.WriteLine("First Name: " + de.Properties["givenName"].Value);
            Console.WriteLine("Last Name : " + de.Properties["sn"].Value);
            Console.WriteLine("SAM account name   : " + de.Properties["samAccountName"].Value);
            Console.WriteLine("User principal name: " + de.Properties["userPrincipalName"].Value);
            Console.WriteLine();
        }
    }
}

Attribute Considerations

Note that "givenName" corresponds to the First Name, while "sn" represents the Last Name. As for usernames, Active Directory stores two logon names: "samAccountName" (pre-Windows 2000) and "userPrincipalName" (post-Windows 2000).

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