[英]How to disable button when the login is false using MVVM,WPF in C#
我正在研究 mvvm 模式並遇到了一個問題,我需要確保當用戶錯誤地輸入他的數據時按鈕處於非活動狀態
我有對話窗口(登錄頁),我在其中投票登錄名和密碼
public class LoginViewModel : ViewModel
{
ApplicationDbContext db;
IEnumerable<User> users;
IAuthorizationService _authorizationService;
IHashingManager _hashingManager;
private bool? _closeWindow;
private RelayCommand _loginUser;
private RelayCommand _cancelCommand;
public bool EnableClose { get; set; }
public LoginViewModel(IViewFactory viewFactory, ICore core) : base(viewFactory)
{
_authorizationService = core.AuthorizationService;
_hashingManager = core.HashingManager;
db = new ApplicationDbContext();
}
public ICommand Command { get; set; }
private string login;
public string Login
{
get => login;
set
{
login = value;
RaisePropertyChanged(nameof(Login));
}
}
private string password;
public string Password
{
get => password;
set
{
password = value;
RaisePropertyChanged(nameof(Password));
}
}
public RelayCommand CancelCommand
{
get
{
return _cancelCommand ??
(_cancelCommand = new RelayCommand(() =>
{
var result = _authorizationService.Login(Login, _hashingManager.Encrypt(Password));
CloseWindow = true;
}));
}
}
public bool? CloseWindow
{
get { return _closeWindow; }
set
{
_closeWindow = value;
RaisePropertyChanged(nameof(CloseWindow));
}
}
public RelayCommand LoginUser
{
get
{
return _loginUser ??
(_loginUser = new RelayCommand(() =>
{
var result = _authorizationService.Login(Login, _hashingManager.Encrypt(Password));
CloseWindow = true;
}));
}
}
public IEnumerable<User> Users
{
get { return users; }
set
{
users = value;
RaisePropertyChanged("Users");
}
}
}
我的主窗口虛擬機
public class MainViewModel : ViewModel
{
private readonly ICore _core;
public ICommand LoginCommand { get; }
public ObservableCollection<ILayoutElementViewModel> Documents { get; private set; }
public MainViewModel(IViewFactory viewFactory, ICore core) : base(viewFactory)
{
_core = core;
this.Documents = new ObservableCollection<ILayoutElementViewModel>();
}
ServiceResult _serviceResult = new ServiceResult();
private RelayCommand openChartView;
public RelayCommand OpenChartView
{
get
{
return openChartView ??
(openChartView = new RelayCommand(()=>
{
if (_serviceResult.IsSucceed)
{
var chartView = new ChartSelectionViewModel(_viewFactory);
_viewFactory.ShowDialogView(chartView);
}
}));
}
}
private string _myProperty;
public string MyProperty
{
get => _myProperty;
set
{
_myProperty = value;
RaisePropertyChanged(() => MyProperty);
}
}
protected override void LoadedExecute()
{
base.LoadedExecute();
_viewFactory.ShowDialogView(new LoginViewModel(_viewFactory, _core));
}
}
當我寫得正確與否時,我的對話窗口關閉,主窗口變為活動狀態。 有一個按鈕,當登錄名和密碼不正確時,我想禁用此按鈕。
我想我必須在 MW 中使用我的 ServiceResult
public class ServiceResult
{
public bool IsSucceed { get; set; }
public string Error { get; set; }
public ServiceResult()
{
IsSucceed = true;
}
public ServiceResult(string error)
{
IsSucceed = false;
Error = error;
}
}
或者
授權服務
public class AuthorizationService : IAuthorizationService
{
public ServiceResult Login(string login,string password)
{
ApplicationDbContext db = new ApplicationDbContext();
var listUsers = db.Users.ToList();
foreach (var item in listUsers)
{
if (item.Login == login && item.Password == password)
{
return new ServiceResult();
}
}
return new ServiceResult("Wrong Login or Password!");
}
}
我怎樣才能做到這一點? 謝謝你。
我做到了,太容易了
protected override void LoadedExecute()
{
base.LoadedExecute();
var vm = new LoginViewModel(_viewFactory, _core);
_viewFactory.ShowDialogView(vm);
IsAuth = vm.AuthorizationResult;
}
private RelayCommand openChartView;
public RelayCommand OpenChartView
{
get
{
return openChartView ??
(openChartView = new RelayCommand(()=>
{
if (IsAuth)
{
var chartView = new ChartSelectionViewModel(_viewFactory);
_viewFactory.ShowDialogView(chartView);
}
}));
}
}
您可以對按鈕的 IsEnable 屬性執行 bool 綁定。
代碼:
public bool Enabled
{
get => _enabled; set
{
_enabled = value;
NotifypropertyChanged("Enabled");
}
}
xml:
<Button IsEnabled="{Binding Enabled}"></Button>
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