Validate if a user exists in Active Directory in Asp.net web api core

Question

How can I check the user is exist or not in Active Directory. we are passing emailId as userName to the method parameter and it is GET method.

We have written this method, but it is not working properly.

[HttpGet("GetADUsers")]
public List<string> GetADUsers(string userName)
{
        var domainUsers = new List<string>();
        try
        {
            string domainName = _domainSettings.Value.DomainName;
            string domainUserName = _domainSettings.Value.UserName;
            string domainPassword = _domainSettings.Value.Password;

            PrincipalContext pc = new PrincipalContext(ContextType.Domain, domainName, domainUserName, domainPassword, ContextOptions.SimpleBind.ToString());

            UserPrincipal principalUser = new UserPrincipal(pc);

            using (var search = new PrincipalSearcher(principalUser))
            {
                foreach (var user in search.FindAll().Where(x => x.DisplayName == userName))
                {
                    if (user.DisplayName != null)
                    {
                        domainUsers.Add(user.DisplayName);
                    }
                }
            }
        }
        catch (Exception ex)
        {
            ex.Message.ToString();
        }

        return domainUsers;
    }

Your mistake is comparing the userName to the DisplayName. You should probably be comparing it to the SamAccountName property, which is the username in AD. But the answer by marc_s will likely be a faster search anyway. — Gabriel Luci
– Gabriel Luci, Commented Nov 26, 2018 at 13:43

marc_s · Accepted Answer · 2018-11-26 12:57:28Z

4

After you've created the PrincipalContext, you could just call UserPrincipal.FindByIdentity() - if the user is found, you get back the UserPrincipal - otherwise null.

[HttpGet("GetADUsers")]
public bool ADUserExists(string userName)
{
    string domainName = _domainSettings.Value.DomainName;
    string domainUserName = _domainSettings.Value.UserName;
    string domainPassword = _domainSettings.Value.Password;

    PrincipalContext pc = new PrincipalContext(ContextType.Domain, domainName, domainUserName, domainPassword, ContextOptions.SimpleBind.ToString());

    UserPrincipal principalUser = UserPrincipal.FindByIdentity(pc, userName);

    if (principalUser != null) 
    {
         // gefunden ....            
         return true;
    }
    else
    {
         // nicht gefunden  
         return false;
    }
}

answered Nov 26, 2018 at 12:57

marc_s

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1 Comment

Aniket Phate Over a year ago

Thank You Buddy for the solution

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