WPF Prism中的登录窗口

在shell运行之前，我正在实现一个登录窗口。我将如何运行代码，并在登录窗口中进行身份验证后，继续执行shell应用程序

这是我的初始代码：

LoginViewModel.cs

public event EventHandler LoginCompleted;
    private void RaiseLoginCompletedEvent()
    {
        LoginCompleted?.Invoke(this, EventArgs.Empty);
    }

从Shell启动Bootstraper.cs

这里的问题是，我无法实例化我的LoginModel，因为我的模型的构造函数有一个参数来使用我的服务接口

---

有什么解决办法吗？谢谢

新建一个类的实例，该类自己实现

ILoginAuth

接口：

var loginVM = new LoginViewModel(new LoginAuth());

…或者让容器为您执行以下操作：

var loginVM = new LoginViewModel(Container.Resolve<ILoginAuth>());

---

另一种方法是：

ILoginAuth auth = CommonServiceLocator.ServiceLocator.Current.GetInstance<ILoginAuth>();

ILoginAuth auth=CommonServiceLocator.ServiceLocator.Current.GetInstance（）；

这样，您就不必在构造函数中包含

ILoginAuth

。而且，你可以在任何地方做这件事

    <pre>
    /*Brian code modified */
    
    public interface ICloseWindow {
      Action Close {
        get;
        set;
      }
    }
    
    public partial class LoginWindow: Window {
      public LoginWindow(ILoginViewModel viewModel) {
        InitializeComponent();
    
        DataContext = viewModel;
    
        Loaded += MainWindow_Loaded;
      }
    
      private void MainWindow_Loaded(object sender, RoutedEventArgs e) {
        if (DataContext is ICloseWindow vm) {
          vm.Close += () =>{
            DialogResult = true;
          };
        }
      }
    
      private void Close_Window(object sender, RoutedEventArgs e) {
        DialogResult = false;
      }
    }
    
    /*App.xaml.cs*/
    protected override void InitializeShell(Window shell) {
      Window login = Container.Resolve < LoginWindow > ();
    
      var result = login.ShowDialog();
    
      if (!result.Value) {
        Application.Current.Shutdown();
      }
      else {
        base.InitializeShell(shell);
      }
    }
    
    public class LoginViewModel: BindableBase,
    ILoginViewModel,
    ICloseWindow {
      private string _userName;
    
      private string _password;
    
      private bool _isAuthenticated;
    
      private ICommand _authenticateUserCommand;
    
      private IEventAggregator _eventAggregator;
    
      public Action Close {
        get;
        set;
      }
    
      public ICommand AuthenticateUserCommand {
        get =>_authenticateUserCommand;
        set =>_authenticateUserCommand = value;
      }
    
      public LoginViewModel(IEventAggregator eventAggregator) {
        AuthenticateUserCommand = new DelegateCommand < object > (AuthenticateUser);
    
        _eventAggregator = eventAggregator;
      }
    
      private void AuthenticateUser(object parameter) {
        var passwordBox = parameter as PasswordBox;
    
        var password = passwordBox.Password;
    
        if (password == "password") {
          _isAuthenticated = true;
    
          _eventAggregator.GetEvent < MessageSentEvent > ().Publish("Login Data");
        }
    
        if (_isAuthenticated) {
          Close ? .Invoke();
        }
      }
    
      public string UserName {
        get =>_userName;
        set =>_userName = value;
      }
    
      public string Password {
        get {
          return _password;
        }
        set {
          if (_password != value) {
    
            _password = value;
    
            RaisePropertyChanged(nameof(Password));
    
          }
        }
      }
    }

<Window x:Class="YourApplication.Views.LoginWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:YourApplication"
        mc:Ignorable="d"
        Title="LoginWindow"
        Height="450"
        Width="800"
        WindowStartupLocation="CenterScreen"
        WindowStyle="None"
        x:Name="WindowBorder"
        RenderOptions.BitmapScalingMode="HighQuality">
    <Grid SnapsToDevicePixels="True"
          UseLayoutRounding="True"
          TextOptions.TextFormattingMode="Display"
          TextOptions.TextRenderingMode="ClearType">
        <DockPanel>
            <DockPanel DockPanel.Dock="Left"
                       Width="400"
                       LastChildFill="True">
                <Canvas>
                    <Canvas.Background>
                        <ImageBrush ImageSource="pack://application:,,,/YourApplication;component/Images/Splash.png" />
                    </Canvas.Background>
                    <TextBlock Margin="4,0,0,4"
                               VerticalAlignment="Center"
                               Foreground="#FFAAAAAA"
                               TextWrapping="NoWrap"
                               Text="Library Management System"
                               FontSize="16"
                               Background="Transparent"
                               DockPanel.Dock="Top" />
                </Canvas>
            </DockPanel>
            <DockPanel LastChildFill="True">
                <Button x:Name="PART_CLOSE"
                        DockPanel.Dock="Top"
                        HorizontalAlignment="Right"
                        VerticalAlignment="Center"
                        Margin="5"
                        Height="20"
                        Width="20"
                        Style="{DynamicResource MetroWindowButtonStyle}"
                        Click="Close_Window">
                    <Path Data="F1M54.0573,47.8776L38.1771,31.9974 54.0547,16.1198C55.7604,14.4141 55.7604,11.6511 54.0573,9.94531 52.3516,8.23962 49.5859,8.23962 47.8802,9.94531L32.0026,25.8229 16.1224,9.94531C14.4167,8.23962 11.6511,8.23962 9.94794,9.94531 8.24219,11.6511 8.24219,14.4141 9.94794,16.1198L25.8255,32 9.94794,47.8776C8.24219,49.5834 8.24219,52.3477 9.94794,54.0534 11.6511,55.7572 14.4167,55.7585 16.1224,54.0534L32.0026,38.1745 47.8802,54.0534C49.5859,55.7585 52.3516,55.7572 54.0573,54.0534 55.7604,52.3477 55.763,49.5834 54.0573,47.8776z"
                          Stretch="Uniform"
                          Fill="#FFAAAAAA"
                          Width="10"
                          Margin="0,0,0,0"></Path>
                </Button>
                <StackPanel>
                    <PasswordBox x:Name="txtPassword"
                                 Margin="2,20,10,10"
                                 Height="22"
                                 Width="100" />
                    <Button Width="100"
                            Height="22"
                            Margin="10,150,10,10"
                            Content="Login"
                            Command="{Binding AuthenticateUserCommand}"
                            CommandParameter="{Binding ElementName=txtPassword}" />
                </StackPanel>
            </DockPanel>
        </DockPanel>
    </Grid>
</Window>

    </pre>

/*布赖恩代码修改*/
公共界面关闭窗口{
行动结束{
得到；
设置
}
}
公共部分类登录窗口：窗口{
公共登录窗口（ILoginViewModel viewModel）{
初始化组件（）；
DataContext=viewModel；
加载+=主窗口\u加载；
}
已加载私有void主窗口（对象发送器、路由目标）{
如果（DataContext是ICloseWindow vm）{
vm.Close+=（）=>{
DialogResult=true；
};
}
}
私有无效关闭窗口（对象发送方，路由目标e）{
DialogResult=false；
}
}
/*App.xaml.cs*/
受保护的覆盖无效初始值设置shell（窗口外壳）{
windowlogin=Container.Resolve（）；
var result=login.ShowDialog（）；
如果（！result.Value）{
Application.Current.Shutdown（）；
}
否则{
基础。初始值设定为shell（外壳）；
}
}
公共类LoginViewModel:BindableBase，
ILoginViewModel，
ICloseWindow{
私有字符串\u用户名；
私有字符串\u密码；
私人住宅已通过认证；
专用ICommand_authenticateUserCommand；
私人事件聚合器；
公众行动结束{
得到；
设置
}
公共ICommand AuthenticateUserCommand{
get=>\u authenticateUserCommand；
set=>\u authenticateUserCommand=value；
}
公共登录查看模型（IEventAggregator事件聚合器）{
AuthenticateUserCommand=newdelegateCommand