Question

我有一个需要使用多个命令行参数调用的wpf应用程序。出于这个原因，我如何在我放在窗口中的标签中显示它们？我试图实现数据绑定，但没有成功， - 变量被正确读取和分配，但由于一些荒谬的原因没有显示在屏幕上，我想要的标签中。这是代码：

public partial class MainWindow : Window
{
    public Notification _notif = new Notification();
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = new Notification();
    }

    protected override void OnClosed(EventArgs e)
    {
        base.OnClosed(e);
        App.Current.Shutdown();
    }
}

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e){
        if (e.Args.Length >= 4)
        {
            MainWindow mainWindow = new MainWindow();

            Label count_label = (Label)mainWindow.FindName("count");
            count_label.DataContext = mainWindow._notif;

            System.Diagnostics.Debug.WriteLine(mainWindow._notif.count + " - notif.count");
            // bind the Date to the UI
            count_label.SetBinding(Label.ContentProperty, new Binding("count")
            {
                Source = mainWindow._notif,
                Mode = BindingMode.TwoWay
            });
            //assigning values to the labels

            System.Diagnostics.Debug.WriteLine(count_label.Content + " - content of the label 'count'");
            mainWindow._notif.count = e.Args[0];
            System.Diagnostics.Debug.WriteLine(e.Args[0] + " is the argument n. 0");
            System.Diagnostics.Debug.WriteLine(mainWindow._notif.count + " - notif.count");


            System.Diagnostics.Debug.WriteLine(count_label.Content + "-------------------");

            System.Diagnostics.Debug.WriteLine(count_label.Content + " - content of the label 'count'");
            mainWindow._notif.count = "1234";
            System.Diagnostics.Debug.WriteLine(mainWindow._notif.count + " - notif.count");
            System.Diagnostics.Debug.WriteLine(count_label.Content + " - content of the label 'count'");

        }
    }
}

public class Notification : INotifyPropertyChanged
{
    private string _count;

    public string count {
        get {
            return _count;
        }

        set {
            _count = value;
            OnPropertyChanged("count");
        }
    }

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    #endregion
}

在这里你可以看到xaml的一个片段：

<Label x:Name="count" Content="{Binding count}" HorizontalAlignment="Center" Margin="0,10,486,0" VerticalAlignment="Top" RenderTransformOrigin="-2.895,-0.769" Height="80" Width="145" FontFamily="Arial" FontSize="64" HorizontalContentAlignment="Center"/>

谢谢你。

Answer 1

该示例说明了如何在标签中显示参数。

这是应用程序的切入点：

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        var argumentsInfo = BuildArgumentsInfo(e.Args);
        var viewModel = new MainWindowViewModel(argumentsInfo);
        var window = new MainWindow(viewModel);
        window.Show();
    }

    private string BuildArgumentsInfo(string[] args)
    {
        return args.Any()
            ? args.Aggregate((arg1, arg2) => arg1 + " " + arg2)
            : "No arguments";
    }
}

这是视图模型（视图的数据上下文）：

public interface IMainWindowViewModel
{
    string Arguments { get; set; }
}

public class MainWindowViewModel : IMainWindowViewModel, INotifyPropertyChanged
{
    private string _arguments;

    public MainWindowViewModel(string argumentsInfo)
    {
        Arguments = argumentsInfo;
    }

    public string Arguments
    {
        get { return _arguments; }
        set
        {
            _arguments = value;
            RaisePropertyChanged("Arguments");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged = delegate {};

    private void RaisePropertyChanged(string propertyName)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

这是视图（背后的代码）：

public partial class MainWindow : Window
{
    public MainWindow(IMainWindowViewModel viewModel)
    {
        InitializeComponent();
        DataContext = viewModel;
    }
}

这是视图中的标签（XAML）：

<Label Content ="{Binding Arguments}"></Label>

重要！您必须从App.xaml文件中删除StartupUri="MainWindow.xaml，因为MainWindow是从后面的代码启动的。

WPF - 在标签中显示命令行参数

1 个答案: