c# - ViewModel 没有绑定(bind)到 View MvvmCross

Question

我有以下问题:

在应用程序中，当用户返回计算机时，我必须处理该事件并向他显示一个模态窗口，在该窗口中提供 3 个可能的答案。

我使用该服务执行此操作:

public WinUserReturnDialogServiceImpl(ISettingsManager 
settingsManager) : base(settingsManager)
{
    _dialogPage = new UserReturnDialogPage();
    _dialogPage.AddButton.Click += OnAddButtonClick;
    _dialogPage.DivideButton.Click += OnDivideButtonClick;
    _dialogPage.CancelButton.Click += OnCancelButtonClick;

    _dialogWindow = new DialogWindow()
    {
        Content = _dialogPage
    };
}

protected override void ShowCustomDialog(UserReturnDialogData dialogData)
        {

                 _pauseDuration = Math.Floor(dialogData._userAfkMinuites);
                Application.Current.Dispatcher.Invoke(() =>
                {
                    _dialogPage.AFKMessage.Text = string.Format("Вы отсутствовали {0} мин", _pauseDuration);
                    _dialogWindow.Show();
                });
            return;
        }

private void OnAddButtonClick(object sender, RoutedEventArgs e)
    {
        CloseCustomDialog();
    }

后面的页面代码:

//[MvxViewFor(typeof(UserReturnDialogViewModel))]
//[WinContentPresentation(IsSheet = true, TransitionForwardType = TransitionType.ToRight, TransitionReturnType = TransitionType.FromRigth, WindowIdentifier = nameof(DialogWindow))]
[MvxContentPresentation(WindowIdentifier = nameof(DialogWindow), StackNavigation = false)]
public partial class UserReturnDialogPage : MvxWpfView<UserReturnDialogViewModel>
{

    public UserReturnDialogPage() 
    {
        InitializeComponent();

    }

和页面 xaml:

<views:MvxWpfView
x:Class="SmlHours.Win.Presentation.Views.Pages.Dialogs.UserReturnDialogPage"
x:TypeArguments="vm:UserReturnDialogViewModel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:views="clr-namespace:MvvmCross.Platforms.Wpf.Views;assembly=MvvmCross.Platforms.Wpf"
xmlns:vm="clr-namespace:SmlHours.Core.Presentation.ViewModels.Dialogs;assembly=SmlHours.Core"
...
<Button
x:Name="AddButton"
HorizontalAlignment="Left"
Visibility="Visible"
Width="85"
Height="32"
Template="{DynamicResource BaseNavigationButtonTemplate}"
Command="{Binding AddTimeAfterUserReturn}"

View 模型:

public class UserReturnDialogViewModel : BaseViewModel
    {

        private IMonitoringInteractor _monitoringInteractor;

        public IMvxCommand AddTimeAfterUserReturn { get; private set; }

        public UserReturnDialogViewModel(IMonitoringInteractor monitoringInteractor)
        {
            _monitoringInteractor = monitoringInteractor;
            AddTimeAfterUserReturn = CreateAsyncCommand(AddTimeAfterReturnTask);
        }

        //I need to fire this command after button pressed!!!
        private Task AddTimeAfterReturnTask() => Task.Run(async () =>
        {
            var model = _monitoringInteractor.FixationTimeAfterUserReturn();
        });
    }

事件被触发，页面被显示，但是 View 模型没有附加到页面并且不响应按钮按下。但是，关闭窗口的 OnAddButtonClick 等服务命令会对按下按钮使用react。 如何绑定(bind) View 和 View 模型，以便按下按钮在 View 模型中起作用？ 非常感谢回复的人

Answer 1

问题是我尝试手动创建新的窗口/页面。要绑定(bind) vm 和 View ，应使用 ViewDispatcher:

 var ViewDispatcher = Mvx.Resolve<IMvxViewDispatcher>();
 ViewDispatcher.ShowViewModel(newMvxViewModelRequest(typeof(UserReturnDialogViewModel)));