Question

我的应用是一个winforms应用程序，它引用了ReactiveUI 6.5。当用户输入＆＃34;退出＆＃34;我试图关闭窗口。在TextBox中，但由于某种原因没有任何反应。

这是我的观点：

public partial class HomeView : Form, IViewFor<HomeViewModel>
{
    public HomeView()
    {
        InitializeComponent();
        ViewModel = new HomeViewModel();

        this.Bind(ViewModel, x => x.EnteredText, x => x.textBox.Text);
        this.ViewModel.WhenAnyObservable(x => x.ExitCmd).Subscribe(_ => this.Close());

    }

    object IViewFor.ViewModel
    {
        get { return ViewModel; }
        set { ViewModel = (HomeViewModel)value; }
    }

    public HomeViewModel ViewModel { get; set; }
}

这是我的ViewModel：

 public class HomeViewModel : ReactiveUI.ReactiveObject
{
    string _text;
    public string EnteredText
    {
        get { return _text; }
        set { this.RaiseAndSetIfChanged(ref _text, value); }
    }

    public ReactiveCommand<object> ExitCmd { get; private set; }

    public HomeViewModel()
    {
        ExitCmd = ReactiveCommand.Create(this.WhenAny(x => x.EnteredText, y => y.Value == "Exit"));
    }
}

Answer 1

在ViewModel中，您应该描述Exit Command和EntertedText之间的关系

public class HomeViewModel : ReactiveUI.ReactiveObject
        {
            private string _text;
            public string EnteredText
            {
                get { return _text; }
                set { this.RaiseAndSetIfChanged(ref _text, value); }
            }

            public ReactiveCommand<object> ExitCmd { get; private set; }

            public HomeViewModel()
            {
                ExitCmd = ReactiveCommand.Create();
                this.WhenAny (x => x.EnteredText, x => x.Value == "Exit")
                .Where(k => k == true)
                .DistinctUntilChanged()
                .InvokeCommand (ExitCmd);
            }
        }

然后在您看来，您可以简单地订阅它

public partial class HomeView : Form, IViewFor<HomeViewModel>
{
    public HomeView()
    {
        InitializeComponent();
        ViewModel = new HomeViewModel();

        this.Bind(ViewModel, x => x.EnteredText, x => x.textBox.Text);
        this.ViewModel.ExitCmd.Subscribe (_ => this.Close());

    }

    object IViewFor.ViewModel
    {
        get { return ViewModel; }
        set { ViewModel = (HomeViewModel)value; }
    }

    public HomeViewModel ViewModel { get; set; }
}

Answer 2

你几乎得到了它，除了没有告诉你Execute ReactiveCommand.Create。您传递给canExecute的值是ExitCmd = ReactiveCommand.Create(); this.WhenAnyValue(x => x.EnteredText) .Where(x => x == "Exit") .InvokeCommand(ExitCmd);属性。您应该将其更改为：

InvokeCommand

ExecuteAsync实际执行命令参数，将可观察序列中的每个值作为参数传递给curl方法。

ReactiveUI WhenAnyObservable对我不起作用

2 个答案: