CODEWITHSUNDEEP
c#.net
Ben Coffman
Ben Coffman

Reputation: 1740

UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(ctx, found.DisplayName) returns null

Not sure why this happens but when I run this code it works on one server but not on another.

Both servers return a correct found.DisplayName however only one server returns a value for oUserPrincipal the other returns a null value.

Line of error:

       UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(ctx, found.DisplayName) returns null


        dynamic config = _getExpandoFromXml("config.xml");

        PrincipalContext ctx = new PrincipalContext(ContextType.Domain, config.activeDirectory.sDomain, config.activeDirectory.sDefaultOU,config.mailServer.user, config.mailServer.pass);
        UserPrincipal user = new UserPrincipal(ctx);

        PrincipalSearcher search = new PrincipalSearcher(user);
        Console.WriteLine("before foreach");
        foreach (Principal found in search.FindAll())
        {
            try{
                if (found.DisplayName == null)
                {
                    Console.WriteLine("found.Dispalyname is null");
                }
                else
                {    
                    Console.Write("Dispalyname: ");
                    Console.WriteLine(found.DisplayName);
                }
                UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(ctx, found.DisplayName);
                Console.Write("looking for user: ");
                Console.WriteLine(found.DisplayName);
                Console.WriteLine("after findbyidentiy");
                if (oUserPrincipal == null)
                {
                    Console.WriteLine("oUserPrinciapal is null");
                }
                if (oUserPrincipal.LastPasswordSet == null)
                {
                    Console.WriteLine("lastpasswordset is null");
                }
                DateTime? dateOrNull = oUserPrincipal.LastPasswordSet;
                Console.WriteLine("after LastPasswordSet");

Upvotes: 0

Views: 1932

Answers (2)

vapcguy
vapcguy

Reputation: 7545

In my case, I found the issue was that it wasn't connecting to the AD server. If I hovered over oPrincipalContext, its property of ConnectedServer showed that it threw an exception of type System.DirectoryServices.DirectoryServicesCOMException. If this happens, a restart of services on the Domain Controller should work. We found it can happen during high-login times, since we only have 1 DC on our dev network.

enter image description here

Upvotes: 0

Nick Sarabyn
Nick Sarabyn

Reputation: 1680

FindByIdentity can only search on a handful of properties. These are "any format that is contained in the IdentityType enumeration".

Name is a valid option but DisplayName is not listed so you will probably get results where the DisplayName and Name happen to be the same and it will fail otherwise.

Using:

var oUserPrincipal = UserPrincipal.FindByIdentity(ctx, found.Name);

or

var oUserPrincipal = UserPrincipal.FindByIdentity(ctx, found.SamAccountName);

should work.

There is also a three parameter version of FindByIdentity that allows you to specify the property you would like to search on.

Upvotes: 1

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