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，在其中提供3种可能的答案。

我使用服务执行此操作：

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();

    }

和第xaml页：

<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}"

ViewModel：

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();
        });
    }

事件已触发，显示了页面，但视图模型未附加到页面，并且不响应按钮的按下。但是，关闭窗口的OnAddButtonClick等服务命令会对按下按钮做出反应。如何绑定视图和视图模型，以便在视图模型中按下按钮可以正常工作？非常感谢那些回答的人

Answer 1

问题是我尝试手动创建新的窗口/页面。对于绑定虚拟机和视图，应使用ViewDispatcher：

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

ViewModel不绑定到View MvvmCross

1 个答案: