C# AD 验证登陆

using System.DirectoryServices;

using System.DirectoryServices.AccountManagement;

using (DirectoryEntry adsEntry = new DirectoryEntry("LDAP://test.com", userName, password, AuthenticationTypes.Secure))

                {

                    using (DirectorySearcher adsSearcher = new DirectorySearcher(adsEntry))

                    {

                        adsSearcher.Filter = "(sAMAccountName=" + userName + ")";

                        try

                        {

                            SearchResult adsSearchResult = adsSearcher.FindOne();

                        }

                        catch (Exception ex)

                        {

                            // 用户名或密码错误

                            string strError = ex.Message;

                        }

                        finally

                        {

                            adsEntry.Close();

                        }

                    }

                }