diff --git a/插件库/Lskj.Main/Hosting/IExternalMainShell.cs b/插件库/Lskj.Main/Hosting/IExternalMainShell.cs
index 53d0ef0..16864f7 100644
--- a/插件库/Lskj.Main/Hosting/IExternalMainShell.cs
+++ b/插件库/Lskj.Main/Hosting/IExternalMainShell.cs
@@ -10,6 +10,8 @@ namespace Lskj.Main.Hosting
     {
         bool IsOpen { get; }
 
+        DialogResult ShowLoginDialog(object loginRuntime);
+
         DialogResult ShowDialog();
 
         void RequestRelogin();
diff --git a/插件库/Lskj.Main/Hosting/LegacyApplicationHost.cs b/插件库/Lskj.Main/Hosting/LegacyApplicationHost.cs
index febbf40..3bc8d05 100644
--- a/插件库/Lskj.Main/Hosting/LegacyApplicationHost.cs
+++ b/插件库/Lskj.Main/Hosting/LegacyApplicationHost.cs
@@ -1,5 +1,17 @@
 using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using DevExpress.LookAndFeel;
+using Lskj.Business;
+using Lskj.Business.Impl;
+using Lskj.Control.Model;
+using Lskj.Core;
+using Lskj.Data;
 using Lskj.Main.Model;
+using Lskj.Model;
+using Lskj.Util;
 
 namespace Lskj.Main.Hosting
 {
@@ -26,4 +38,402 @@ namespace Lskj.Main.Hosting
             }
         }
     }
+
+    /// <summary>
+    /// 向外部 WPF 登录页提供旧账套、用户、认证和会话状态写入能力。
+    /// 该类型不创建 WinForms 控件，也不引用 WPF。
+    /// </summary>
+    public sealed class LegacyLoginRuntime
+    {
+        private DataTable _ledgerTable;
+
+        public LegacyLoginRuntime()
+        {
+            ERPInfo.Instance.LoginResult = false;
+        }
+
+        public string SelectedLedgerName { get; private set; }
+
+        public string LoginName
+        {
+            get { return DBConfig.Instance.LoginName ?? string.Empty; }
+        }
+
+        public bool RememberPasswordEnabled
+        {
+            get { return !SystemInfo.Instance.DisableRememberPassword; }
+        }
+
+        public DataTable LoadLedgers()
+        {
+            _ledgerTable = MainImpl.GetLedgerList() ?? new DataTable("Ledgers");
+            SelectedLedgerName = ResolveSelectedLedgerName(_ledgerTable);
+            return _ledgerTable;
+        }
+
+        public DataTable LoadUsers()
+        {
+            DataTable users = SystemInfo.Instance.DisplayUserCode
+                ? MainImpl.GetEmployeeListNew()
+                : MainImpl.GetEmployeeList();
+            return users ?? new DataTable("Users");
+        }
+
+        public DataTable SelectLedger(string ledgerName)
+        {
+            if (string.IsNullOrWhiteSpace(ledgerName))
+                throw new InvalidOperationException("请选择账套。");
+            if (_ledgerTable == null)
+                LoadLedgers();
+
+            DataRow ledger = _ledgerTable.Rows.Cast<DataRow>().FirstOrDefault(
+                row => string.Equals(
+                    Value(row, "ShowName"),
+                    ledgerName,
+                    StringComparison.OrdinalIgnoreCase));
+            if (ledger == null)
+                throw new InvalidOperationException("未找到所选账套，请重新选择。");
+
+            string serverName = Value(ledger, "IP");
+            string database = Value(ledger, "DBName");
+            string dataBook = Value(ledger, "ShowName");
+            if (string.IsNullOrWhiteSpace(serverName) ||
+                string.IsNullOrWhiteSpace(database))
+            {
+                throw new InvalidOperationException(ResourceKeys.UnSetServerAddress);
+            }
+
+            string oldServerName = DBConfig.Instance.ServerName;
+            string oldDatabase = DBConfig.Instance.DataBase;
+            string oldDataBook = DBConfig.Instance.DataBook;
+            string oldSelectedLedgerName = SelectedLedgerName;
+            string oldAccountBook = ERPInfo.Instance.AccountBook;
+            try
+            {
+                DBConfig.Instance.ServerName = serverName;
+                DBConfig.Instance.DataBase = database;
+                DBConfig.Instance.DataBook = dataBook;
+
+                if (!DBConfig.Instance.CreateConnection(DBConfig.Instance.Connection))
+                    throw new InvalidOperationException(ResourceKeys.ServerAddressFault);
+                if (!DBConfig.Instance.ServerType.Equals("达梦数据库") &&
+                    DelphiHelper.Delphi_Init(new StringBuilder(
+                        DBConfig.Instance.GetDelphiConnection(
+                            DBConfig.Instance.dephiConnection))) == 0)
+                {
+                    throw new InvalidOperationException(
+                        ResourceKeys.UnConnectServer + "[By Delphi]");
+                }
+
+                SystemInfo.RefreshSystemParam();
+                DataTable users = LoadUsers();
+
+                SelectedLedgerName = dataBook;
+                ERPInfo.Instance.AccountBook = dataBook;
+                return users;
+            }
+            catch (Exception switchException)
+            {
+                DBConfig.Instance.ServerName = oldServerName;
+                DBConfig.Instance.DataBase = oldDatabase;
+                DBConfig.Instance.DataBook = oldDataBook;
+                SelectedLedgerName = oldSelectedLedgerName;
+                ERPInfo.Instance.AccountBook = oldAccountBook;
+                try
+                {
+                    DBConfig.Instance.CreateConnection(DBConfig.Instance.Connection);
+                    if (!DBConfig.Instance.ServerType.Equals("达梦数据库"))
+                    {
+                        DelphiHelper.Delphi_Init(new StringBuilder(
+                            DBConfig.Instance.GetDelphiConnection(
+                                DBConfig.Instance.dephiConnection)));
+                    }
+                    SystemInfo.RefreshSystemParam();
+                }
+                catch (Exception restoreException)
+                {
+                    LogHelper.Instance.WriteError(restoreException);
+                }
+
+                LogHelper.Instance.WriteError(switchException);
+                throw;
+            }
+        }
+
+        public string LoadRememberedPassword(string loginName)
+        {
+            if (!RememberPasswordEnabled || string.IsNullOrWhiteSpace(loginName))
+                return null;
+
+            try
+            {
+                string encrypted = IniHelper.Read(
+                    DBConfig.Instance.ServerName + loginName);
+                if (string.IsNullOrWhiteSpace(encrypted))
+                    return null;
+
+                string[] parts = AESUtil.Decrypt(encrypted).Split('^');
+                bool remember;
+                if (parts.Length < 2 ||
+                    !bool.TryParse(parts[0], out remember) ||
+                    !remember)
+                {
+                    return null;
+                }
+
+                return string.Join("^", parts.Skip(1).ToArray());
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        public string Login(
+            string loginName,
+            string password,
+            bool rememberPassword)
+        {
+            ERPInfo.Instance.LoginResult = false;
+            if (string.IsNullOrWhiteSpace(loginName))
+                return ResourceKeys.UserNameNotNull;
+            if (password == null)
+                password = string.Empty;
+
+            try
+            {
+                DataTable users = MainImpl.GetEmployeeList();
+                string displayColumn = ResolveDisplayColumn(users);
+                List<DataRow> matches = users.Rows.Cast<DataRow>()
+                    .Where(row =>
+                        string.Equals(
+                            Value(row, displayColumn),
+                            loginName,
+                            StringComparison.OrdinalIgnoreCase) ||
+                        string.Equals(
+                            Value(row, "UserCode"),
+                            loginName,
+                            StringComparison.OrdinalIgnoreCase))
+                    .ToList();
+                if (matches.Count == 0)
+                    return ResourceKeys.NameOrPasswordError;
+                if (matches.Count > 1)
+                    return ResourceKeys.DuplicatedNameError;
+
+                DataRow user = matches[0];
+                string userId = Value(user, "UserId");
+                string userName = Value(user, "UserName");
+                string loginAccount = Value(user, "UserCode");
+                if (string.IsNullOrWhiteSpace(userId))
+                    return ResourceKeys.UserNotFound;
+
+                ERPInfo.Instance.LoginResult = false;
+                if (SystemInfo.Instance.MacEnabled)
+                {
+                    int macResult = MainImpl.CheckMacAddress(
+                        ERPInfo.Instance.MacAddress,
+                        userId);
+                    MainImpl.LoginAfterRegister(
+                        ERPInfo.Instance.MacAddress,
+                        userId);
+                    if (macResult == 0)
+                        return ResourceKeys.LoginFault + ResourceKeys.UnKownMacAddress;
+                    if (macResult == -1)
+                        return ResourceKeys.LoginFault + ResourceKeys.UnKownMacAddressTable;
+                }
+
+                string keyError = VerifyEncryptionKey();
+                if (!string.IsNullOrEmpty(keyError))
+                    return keyError;
+
+                if (!MainImpl.CheckingMacAddress(userId))
+                    return ResourceKeys.MacAddressError +
+                        ",当前地址：" + ERPInfo.Instance.MacAddress;
+
+                int loginResult = MainImpl.Login(userId, password, false);
+                if (loginResult != 0)
+                    return LoginError(loginResult);
+
+                CompleteLogin(
+                    userId,
+                    userName,
+                    loginAccount,
+                    loginName,
+                    password,
+                    rememberPassword);
+                ERPInfo.Instance.LoginResult = true;
+                LogUtil.WriteDebug("", "登录软件", "进入操作", "系统登录");
+                return string.Empty;
+            }
+            catch (Exception exception)
+            {
+                ERPInfo.Instance.LoginResult = false;
+                LogUtil.WriteError(ResourceKeys.UserLogin, exception);
+                return ResourceKeys.LoginFault;
+            }
+        }
+
+        private static string VerifyEncryptionKey()
+        {
+            if (!SystemInfo.Instance.IsEncrypt)
+                return string.Empty;
+
+            int[] keyHandles = ERPInfo.Instance.keyHandles = new int[8];
+            int[] keyNumbers = ERPInfo.Instance.keyNumber = new int[8];
+            SmartX1Api.SmartX1Find(DBConfig.Instance.ServerName, keyHandles, keyNumbers);
+
+            int keyHandle = keyHandles[0];
+            int pin1 = Convert.ToInt32("0x987F6BCD", 16);
+            int pin2 = Convert.ToInt32("0xE193C5B2", 16);
+            int pin3 = Convert.ToInt32("0xD507CC28", 16);
+            int pin4 = Convert.ToInt32("0x4B125AF6", 16);
+            return SmartX1Api.SmartX1Open(keyHandle, pin1, pin2, pin3, pin4) == 0
+                ? string.Empty
+                : "U盾数据获取失败,请重试或联系管理员";
+        }
+
+        private void CompleteLogin(
+            string userId,
+            string userName,
+            string loginAccount,
+            string enteredLoginName,
+            string password,
+            bool rememberPassword)
+        {
+            if (!MainImpl.HasExistsColumn("p_employeetab", "MacAdress"))
+                BaseImpl.ExecSqlValue("alter table p_employeetab add MacAdress varchar(100)");
+            BaseImpl.ExecSqlValue(string.Format(
+                "update p_employeetab set MacAdress = '{0}' where employeeid='{1}'",
+                (ERPInfo.Instance.MacAddress ?? string.Empty).Replace("'", "''"),
+                userId.Replace("'", "''")));
+
+            if (!MainImpl.HasExistsColumn("p_employeetab", "ClientIp"))
+                BaseImpl.ExecSqlValue("alter table p_employeetab add ClientIp varchar(100)");
+            BaseImpl.ExecSqlValue(string.Format(
+                "update p_employeetab set ClientIp = '{0}' where employeeid='{1}'",
+                (ERPInfo.Instance.LoginIPV4 ?? string.Empty).Replace("'", "''"),
+                userId.Replace("'", "''")));
+
+            if (SystemInfo.Instance.AutoSystemDataFormat)
+            {
+                FormatSystemDatetime formatter = new FormatSystemDatetime();
+                formatter.SetDateTimeFormat();
+            }
+
+            string skinName = MainImpl.GetUserSkin(userId);
+            skinName = string.IsNullOrEmpty(skinName)
+                ? ERPInfo.Instance.SkinName
+                : skinName;
+            UserLookAndFeel.Default.SetSkinStyle(skinName);
+
+            IniHelper.Write(
+                DBConfig.Instance.ServerName + enteredLoginName,
+                AESUtil.Encrypt(rememberPassword + "^" + password));
+
+            ERPInfo.Instance.SeriesId = SystemInfo.Instance.seriesid;
+            ERPInfo.Instance.UserLinkPhone = MainImpl.GetUserPhone(userId);
+            ERPInfo.Instance.UserId = userId;
+            ERPInfo.Instance.UserName = userName;
+            ERPInfo.Instance.Password = SHAHelper.EncryptPassword(password);
+            ERPInfo.Instance.SkinName = skinName;
+            string accountBook = string.IsNullOrWhiteSpace(SelectedLedgerName)
+                ? DBConfig.Instance.DataBook
+                : SelectedLedgerName;
+            ERPInfo.Instance.AccountBook = accountBook;
+            ERPInfo.Instance.LoginAccount = loginAccount;
+            ERPInfo.Instance.InPassWord = password;
+            ERPInfo.Instance.PrimitiveBrowser = SystemInfo.Instance.PrimitiveBrowser;
+
+            DBConfig.Instance.LoginName = enteredLoginName;
+            DBConfig.Instance.NoticeUserID = userId;
+            DBConfig.Instance.NoticeUserName = userName;
+            DBConfig.Instance.DataBook = accountBook;
+            DBConfig.Instance.WriteConfig();
+
+            if (userName.Equals("管理员") &&
+                !string.IsNullOrWhiteSpace(loginAccount))
+            {
+                ERPInfo.Instance.Password = SqlHelper.ExecuteString(
+                    "Password",
+                    "select Password from P_EmployeeTab where LoginAccount='" +
+                    loginAccount.Replace("'", "''") + "'");
+            }
+
+            ERPInfo.Instance.LanguageName = "中文";
+            LanguageTranslation.GetLanguageComparisonTable();
+            TrySetDelphiParameters();
+            PubUtil.ClearFilesInDirectory(PubUtil.ImageDownloadPath);
+        }
+
+        private static void TrySetDelphiParameters()
+        {
+            try
+            {
+                DelphiHelper.Delphi_SetParams(
+                    Convert.ToInt32(ERPInfo.Instance.UserId),
+                    string.IsNullOrWhiteSpace(ERPInfo.Instance.SubSysId)
+                        ? 0
+                        : Convert.ToInt32(ERPInfo.Instance.SubSysId),
+                    new StringBuilder(ERPInfo.Instance.UserName),
+                    new StringBuilder(ERPInfo.Instance.WindowName),
+                    new StringBuilder(ERPInfo.Instance.SkinName));
+            }
+            catch (Exception exception)
+            {
+                LogHelper.Instance.WriteError(exception);
+            }
+        }
+
+        private static string LoginError(int loginResult)
+        {
+            switch (loginResult)
+            {
+                case 1:
+                    return ResourceKeys.NameOrPasswordError;
+                case 2:
+                    return ResourceKeys.AlreadyLogin;
+                case -2:
+                    return ResourceKeys.MultiFailedLogin;
+                default:
+                    return ResourceKeys.LoginFault;
+            }
+        }
+
+        private static string ResolveSelectedLedgerName(DataTable ledgers)
+        {
+            DataRow selected = ledgers.Rows.Cast<DataRow>().FirstOrDefault(
+                row => string.Equals(
+                    Value(row, "DBName"),
+                    DBConfig.Instance.DataBase,
+                    StringComparison.OrdinalIgnoreCase));
+            if (selected == null && !string.IsNullOrWhiteSpace(DBConfig.Instance.DataBook))
+            {
+                selected = ledgers.Rows.Cast<DataRow>().FirstOrDefault(
+                    row => string.Equals(
+                        Value(row, "ShowName"),
+                        DBConfig.Instance.DataBook,
+                        StringComparison.OrdinalIgnoreCase));
+            }
+            if (selected == null)
+                selected = ledgers.Rows.Cast<DataRow>().FirstOrDefault();
+
+            return selected == null ? string.Empty : Value(selected, "ShowName");
+        }
+
+        private static string ResolveDisplayColumn(DataTable users)
+        {
+            string configured = SystemInfo.Instance.LoginUsername;
+            return !string.IsNullOrWhiteSpace(configured) &&
+                users.Columns.Contains(configured)
+                ? configured
+                : "UserName";
+        }
+
+        private static string Value(DataRow row, string columnName)
+        {
+            return row != null && row.Table.Columns.Contains(columnName)
+                ? row[columnName] + string.Empty
+                : string.Empty;
+        }
+    }
 }
diff --git a/插件库/Lskj.Main/Model/Manager.cs b/插件库/Lskj.Main/Model/Manager.cs
index 3f49a41..2faece4 100644
--- a/插件库/Lskj.Main/Model/Manager.cs
+++ b/插件库/Lskj.Main/Model/Manager.cs
@@ -675,6 +675,9 @@ namespace Lskj.Main.Model
         /// <returns>DialogResult.</returns>
         private static DialogResult RunLoginForm()
         {
+            if (ExternalMainShell != null)
+                return ExternalMainShell.ShowLoginDialog(new LegacyLoginRuntime());
+
             FrmLogin frmLogin = new FrmLogin();
             return frmLogin.ShowDialog();
         }