根据当前域来读取OU=xxx下的所有用户

       using System.DirectoryServices;

　　　　IList<ADEntity> entityList = new List<ADEntity>();//保存实体的List集合,作为以后操作的数据源使用
       //根据当前域来读取OU=xxx下的所有用户
       public IList<ADEntity> ReadAD()
       {
           try
           {
               System.DirectoryServices.DirectoryEntry entry = new System.DirectoryServices.DirectoryEntry();
               //entry.Children.Find只能读取下一集如果要下下级要在后面继续加Children.Find

               System.DirectoryServices.DirectoryEntry ou = entry.Children.Find("OU=xxx");
               System.DirectoryServices.DirectorySearcher mySearcher = new System.DirectoryServices.DirectorySearcher(ou);
               mySearcher.Filter = ("(objectClass=user)"); //user表示用户
               foreach (System.DirectoryServices.SearchResult resEnt in mySearcher.FindAll())
               {
                   
               }
           }
           catch (Exception ex)
           {

           }
           finally {
               
           }
           return entityList;
       }