Notify Collection在视图模型中发生了更改

本文关键字:发生了 模型 Collection 视图 Notify | 更新日期: 2023-09-27 17:59:17

我有一个场景,主窗口有内容控制,我通过它切换特定视图的用户控制,并分别有视图模型

在我的一个用户控件中有另一个用户控制器。两者都有一个视图模型

<UserControl DataContext="ViewModel1">
<Grid>
 <ListView ItemsSource="{Binding TimeSlotCollection}"  <!--This Collection is in ViewModel 1-->
                  ">
  </ListView>
  <UserControl DataContext="ViewModel2">
      <DataGrid x:Name="DataGrid" 
              CanUserAddRows="True"                 
              ItemsSource="{Binding TimeSlotCollection,Mode=TwoWay,
              UpdateSourceTrigger=PropertyChanged}"/>  <!--This Collection is in ViewModel 2-->
 </Grid>
</UserControl>  

我想在视图模型2集合更改时通知视图模型1集合

MyViewModel 1

    private ObservableCollection<AttendanceTimeSlotModel> _timeslotCollection;
    public ObservableCollection<AttendanceTimeSlotModel> TimeSlotCollection
    {
        get { return _timeslotCollection; }
        set
        {
            Set(TimeSlotCollectionPropertyName, ref _timeslotCollection, value);
        }
    }

    public const string EmployeesCollectionPropertyName = "Employees";
    private ObservableCollection<EmployeeModel> _employees;
    public ObservableCollection<EmployeeModel> Employees
    {
        get { return _employees; }
        set
        {
            Set(EmployeesCollectionPropertyName, ref _employees, value);
        }
    }

    public const string IsBusyPropertyName = "IsBusy";
    private bool _isBusy = false;
    public bool IsBusy
    {
        get
        {
            return _isBusy;
        }
        set
        {
            Set(IsBusyPropertyName, ref _isBusy, value);
        }
    }

MyViewModel 2

    public const string AttendanceTimeSlotCollectionPropertyName = "TimeSlotCollection";
    private ObservableCollection<AttendanceTimeSlotModel> _timeSlotCollection = null;
    public ObservableCollection<AttendanceTimeSlotModel> TimeSlotCollection
    {
        get
        {
            return _timeSlotCollection;
        }
        set
        {
            Set(AttendanceTimeSlotCollectionPropertyName, ref _timeSlotCollection, value);
        }
    } 
    /// What i trying 
     public void AddNewTimeSlot(AttendanceTimeSlotModel timeSlot)
    {

        _designdataService.InsertTimeSlot(timeSlot);
        var Vm = SimpleIoc.Default.GetInstance<ViewModels.AssignTimeSlotViewModel>();
        RaisePropertyChanged(Vm.TimeSlotCollection);
    }

当我在视图模型2中的集合更新时,我想在视图模型1中通知我想要实现的目标。

Notify Collection在视图模型中发生了更改

使用MVVM时,我喜欢只使用一个视图模型对一个视图。如果您只是将内部UserControl作为其父UserControl的一部分,那么您只需要一个视图模型。试着这样重新排列你的代码:

<UserControl DataContext="ViewModel1">
    <Grid>    
        <ListView ItemsSource="{Binding TimeSlotCollection}" />
        <UserControl DataContext="{Binding TimeSlotCollection}">
            ... 
            <!-- Then inside the inner control -->
            <DataGrid x:Name="DataGrid" ItemsSource="{Binding}" ... />
            ...
        </UserControl>
    </Grid>
</UserControl> 

这样,您只需要在一个视图模型中管理一个集合,大多数问题就会消失。

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