C#操作AD例子：

GetUserEntry

         public static DirectoryEntry GetUserEntryByAccount(DirectoryEntry entry, string account)

                   {

                            DirectorySearcher searcher = new DirectorySearcher(entry);

                            searcher.Filter = "(&(objectClass=user)(SAMAccountName=" + account + "))";

                            SearchResult result = searcher.FindOne();

                            entry.Close();

                            if (result != null)

                            {

                                     return result.GetDirectoryEntry();

                            }

                            return null;

                   }

Set Property

                   public static void SetProperty(DirectoryEntry entry, string propertyName, string propertyValue)

                   {

                            if (entry.Properties.Contains(propertyName))

                            {

                                     if (string.IsNullOrEmpty(propertyValue))

                                     {

                                               object o = entry.Properties[propertyName].Value;

                                               entry.Properties[propertyName].Remove(o);

                                     }

                                     else

                                     {

                                               entry.Properties[propertyName][] = propertyValue;

                                     }

                            }

                            else

                            {

                                     if (string.IsNullOrEmpty(propertyValue))

                                     {

                                               return;

                                     }

                                     entry.Properties[propertyName].Add(propertyValue);

                            }

                   }

Get Property

         public static string GetProperty(DirectoryEntry entry, string propertyName)

                   {

                            if (entry.Properties.Contains(propertyName))

                            {

                                     return entry.Properties[propertyName].Value.ToString();

                            }

                            else

                            {

                                     return string.Empty;

                            }

                   }