快速检索用户信息的方法Active Directory

如何从Active Directory查询用户信息？我有适用的代码,但它确实很慢.我正在使用C#.这是我目前使用的代码:

    static void Main(string[] args)
    {
        SearchResultCollection sResults = null;

        try
        {
            //modify this line to include your domain name
            string path = "LDAP://EXTECH";
            //init a directory entry
            DirectoryEntry dEntry = new DirectoryEntry(path);

            //init a directory searcher
            DirectorySearcher dSearcher = new DirectorySearcher(dEntry);

            //This line applies a filter to the search specifying a username to search for
            //modify this line to specify a user name. if you want to search for all
            //users who start with k - set SearchString to "k"
            dSearcher.Filter = "(&(objectClass=user))";

            //perform search on active directory
            sResults = dSearcher.FindAll();

            //loop through results of search
            foreach (SearchResult searchResult in sResults)
            {
                if (searchResult.Properties["CN"][0].ToString() == "Adit")
                {
                    ////loop through the ad properties
                    //foreach (string propertyKey in
                    //searchResult.Properties["st"])
                    //{

                        //pull the collection of objects with this key name
                        ResultPropertyValueCollection valueCollection =
                        searchResult.Properties["manager"];

                        foreach (Object propertyValue in valueCollection)
                        {

                            //loop through the values that have a specific name
                            //an example of a property that would have multiple
                            //collections for the same name would be memberof
                            //Console.WriteLine("Property Name: " + valueCollection..ToString());
                            Console.WriteLine("Property Value: " + (string)propertyValue.ToString());

                            //["sAMAccountName"][0].ToString();
                        }
                    //}
                    Console.WriteLine(" ");
                }
            }
        }
        catch (InvalidOperationException iOe)
        {
            //
        }
        catch (NotSupportedException nSe)
        {
            //
        }
        finally
        {

            // dispose of objects used
            if (sResults != null)
                sResults.Dispose();

        }
        Console.ReadLine();
    }

从AD获取用户信息的代码更快？

部件

using System.DirectoryServices.AccountManagement;

using (var pc = new PrincipalContext(ContextType.Domain, "MyDomainName"))
{
    var user = UserPrincipal.FindByIdentity(pc, IdentityType.SamAccountName, "MyDomainName\\" + userName);
}

using System.DirectoryServices.AccountManagement;

using (var pc = new PrincipalContext(ContextType.Domain, "MyDomainName"))
{
    var user = UserPrincipal.FindByIdentity(pc, IdentityType.SamAccountName, "MyDomainName\\" + userName);
}

using System.DirectoryServices.AccountManagement;

using (var pc = new PrincipalContext(ContextType.Domain, "MyDomainName"))
{
    var user = UserPrincipal.FindByIdentity(pc, IdentityType.SamAccountName, "MyDomainName\\" + userName);
}

dSearcher.Filter = "(&(objectClass=user))";

dSearcher.Filter = "(&(objectClass=user)(cn=Adit))";

DirectoryEntry deUser = new DirectoryEntry("LDAP://cn=John Doe,cn=Users,dc=yourdomain,dc=com");

if (deUser != null)
{
  ... do something with your user
}

// bind to your domain
PrincipalContext pc = new PrincipalContext(ContextType.Domain, "LDAP://dc=yourdomain,dc=com");

// find the user by identity (or many other ways)
UserPrincipal user = UserPrincipal.FindByIdentity(pc, "cn=John Doe");

        DirectorySearcher searcher = new DirectorySearcher();
        searcher.Filter = "(&(objectCategory=user)(cn=steve.evans))";

        SearchResultCollection results = searcher.FindAll();

        if (results.Count == 1)
        {
            //do what you want to do
        }
        else if (results.Count == 0)
        {
            //user does not exist
        }
        else
        {
            //found more than one user
            //something is wrong
        }