FATrace/FATrace.WPLApp/ViewModels/LoginViewModel.cs

using FATrace.Model;
using FATrace.WPLApp.Core;
using FATrace.WPLApp.Services;
using FreeSql;
using Prism.Commands;
using Prism.Regions;
using System;
using System.Security;
using System.Threading.Tasks;
using System.Windows;

namespace FATrace.WPLApp.ViewModels
{
    public class LoginViewModel : NavigationViewModel
    {
        private readonly IFreeSql _fsql;
        private readonly ILogService _log;
        private readonly SysRunService _sys;
        private readonly IRegionManager _regionManager;

        public LoginViewModel(IFreeSql fsql, ILogService log, SysRunService sysRunService, IRegionManager regionManager)
        {
            _fsql = fsql;
            _log = log;
            _sys = sysRunService;
            _regionManager = regionManager;

            LoginCommand = new DelegateCommand(async () => await DoLoginAsync(), () => !IsBusy)
                .ObservesProperty(() => IsBusy);
        }

        private string _userName;
        public string UserName { get => _userName; set { _userName = value; RaisePropertyChanged(); } }

        private string _password;
        public string Password { get => _password; set { _password = value; RaisePropertyChanged(); } }

        private bool _isBusy;
        public bool IsBusy { get => _isBusy; set { _isBusy = value; RaisePropertyChanged(); } }

        public DelegateCommand LoginCommand { get; }

        private async Task DoLoginAsync()
        {
            if (IsBusy) return;
            try
            {
                if (string.IsNullOrWhiteSpace(UserName) || string.IsNullOrWhiteSpace(Password))
                {
                    MessageBox.Show("请输入用户名和密码", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                    return;
                }

                IsBusy = true;
                var user = await Task.Run(() =>
                {
                    return _fsql.Select<TbUser>()
                        .Where(a => a.UserName == UserName)
                        .First();
                });

                if (user == null)
                {
                    MessageBox.Show("用户不存在", "登录失败", MessageBoxButton.OK, MessageBoxImage.Warning);
                    return;
                }

                // 明文密码对比（与现有模型字段一致）。如后续改为哈希，可在此替换校验逻辑。
                if (!string.Equals(user.Password, Password))
                {
                    MessageBox.Show("密码错误", "登录失败", MessageBoxButton.OK, MessageBoxImage.Warning);
                    return;
                }

                _sys.CurUser = user.UserName;
                _log.Info($"用户登录成功: {user.UserName}");
                UserName="";
                Password="";
                try
                {
                    _regionManager.Regions["ContentRegion"].RequestNavigate("DashBoardView");
                }
                catch { }
            }
            catch (Exception ex)
            {
                _log.Error($"登录异常: {ex}");
                MessageBox.Show($"登录异常: {ex.Message}", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            finally
            {
                IsBusy = false;
            }
        }
    }
}