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Limiting the number of results returned in an Active Directory query using PrincipalSearcher

Posted on 2013-01-03
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Last Modified: 2013-01-07
I have a username textbox on my page. I've created an autocomplete feature which queries Active Directory for all users where the username contains the text in the textbox. Because this is an autocomplete feature, I want to limit the number of results returned to optimize performance. The only methods I see available are FindOne() and FindAll(). Is there a way to get the first 'n' records matching the criteria of the query?

My code currently breaks out of the loop after reading 'n' records but the FindAll() method still returns all matching records causing a performance hit.

[WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public string[] GetUsernames(string partialUsername, int maxResults, string serverName)
        {
            List<string> userNames = new List<string>();
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, serverName);
                
                UserPrincipal userPrincipal = new UserPrincipal(principalContext);
                userPrincipal.Name = "*" + partialUsername + "*";
                PrincipalSearcher principalSearcher = new PrincipalSearcher(userPrincipal);
                                
                PrincipalSearchResult<Principal> results = principalSearcher.FindAll();
                foreach (var result in results)
                {
                    if (!string.IsNullOrEmpty(result.Name))
                    {

                            userNames.Add(result.Name);
                      
                            if (userNames.Count >= maxResults)
                                    break;
                    }
                }
            });
            userNames.Sort();
            return userNames.ToArray();
        }

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Question by:ZaDrizzle
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2 Comments
 
LVL 44

Accepted Solution

by:
Rainer Jeschor earned 500 total points
ID: 38743483
Hi,

you might try this:
Add the following code at your line 13:
((DirectorySearcher)principalSearcher.GetUnderlyingSearcher()).SizeLimit = 10;

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http://msdn.microsoft.com/en-us/library/system.directoryservices.directorysearcher.sizelimit.aspx

HTH
Rainer

BTW: If you would have added SharePoint topic, I would have seen your question earlier ;-)
0
 

Author Closing Comment

by:ZaDrizzle
ID: 38751689
Thanks Rainer!
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