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copied!<p>helper class and enum</p> <pre><code>public enum ActiveDirectoryObjectClass { Computer, User, Domain, Group, } public static class ActiveDirectorySearcher { public static string GetCurrentDomainName() { string result; using (Domain domain = Domain.GetCurrentDomain()) { result = domain.Name; } return result; } public static IEnumerable<T> Select<T>( ActiveDirectoryObjectClass activeDirectoryObjectClass, Func<DirectoryEntry, ActiveDirectoryObjectClass, bool> condition, Func<DirectoryEntry, T> selector ) { List<T> list = new List<T>(); using (Domain domain = Domain.GetCurrentDomain()) using (DirectoryEntry root = domain.GetDirectoryEntry()) { string filter = string.Format("(objectClass={0})", activeDirectoryObjectClass); using (DirectorySearcher searcher = new DirectorySearcher(filter)) { searcher.SearchRoot = root; searcher.SearchScope = SearchScope.Subtree; using (SearchResultCollection result = searcher.FindAll()) { foreach (SearchResult item in result) { using (DirectoryEntry entry = item.GetDirectoryEntry()) { if (condition(entry, activeDirectoryObjectClass)) { list.Add(selector(entry)); } } } } } } return list; } } </code></pre> <p>how to use</p> <pre><code> public IEnumerable<User> GetUsers() { return ActiveDirectorySearcher.Select( ActiveDirectoryObjectClass.User, (entry, adObjectClass) => string.Compare(entry.SchemaClassName, adObjectClass.ToString(), StringComparison.InvariantCultureIgnoreCase) == 0, _ => new User { Name = _.Name.Substring(3), Domain = ActiveDirectorySearcher.GetCurrentDomainName(), }); } </code></pre> <p>Note: User in sample - custom class with properties Name, Domain, etc.</p>

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