Question

我有一个TabControl绑定到视图模型的ObservableCollection属性TabViewModelsCollection。

当在视图模型DeviceState中设置另一个属性时，我想提出一个属性更改事件，并告诉我的TabControl s ItemSource刷新。

问题是我的ItemSource是ObservableCollection ViewModels，当我致电RaisePropertyChanged("TabViewModelsCollection");时，没有任何内容得到更新。

此外，我的标签视图包含多个用户控件和绑定。

应该发挥作用的场景是：设备位于网络上，收集数据，然后更新设备信息选项卡。

目前我的TabControl仅在我选择其他设备时更新，然后选择我想要查看的设备。想想左侧面板设备列表，右侧面板上有设备信息标签。

让我知道你们可能想看到的代码部分，我的代码库非常大，所以发布它很难。

以下是我在视图中定义TabControl的地方：

 <!-- Devist List Controls -->
        <Grid DockPanel.Dock="Left" Margin="5,5">
            <local:DeviceListView DataContext="{Binding DeviceListViewModel}" Grid.Row="0"/>
        </Grid>
        <GroupBox Header="Device Information" DockPanel.Dock="Right" Margin="0,0,5,5">
            <TabControl IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding DeviceListViewModel.SelectedDevice.TabViewModelsCollection}" SelectedItem="{Binding DeviceListViewModel.SelectedDevice.SelectedTabItemVm}"   >
                <TabControl.Resources>
                    <DataTemplate DataType="{x:Type vms:HomeViewModel}">
                        <local:HomeTab/>
                    </DataTemplate>
                    <DataTemplate DataType="{x:Type vms:ConfigurationViewModel}">
                        <Grid>
                            <local:ConfigurationFileView  Visibility="{Binding Configuration, TargetNullValue=Collapsed, FallbackValue=Visible}"/>
                            <local:ErrorTab  Visibility="{Binding Path= Configuration, TargetNullValue=Visible, FallbackValue=Hidden}"/>
                        </Grid>
                    </DataTemplate>
                    <DataTemplate DataType="{x:Type vms:ExpansionModulesViewModelFactory}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="35"/>
                            </Grid.RowDefinitions>
                            <StackPanel Grid.Row="0">
                                <DockPanel >
                                    <local:ExpansionModulesList Title="Discovered/Enumerated" 
                                                        DataContext="{Binding DiscoveredModules}" 
                                                       />
                                    <GridSplitter Width="5"/>
                                    <local:ExpansionModulesList Title="User Action Required" 
                                                        DataContext="{Binding FaultyModules}" 
                                                        />
                                </DockPanel>
                            </StackPanel>
                            <DockPanel Grid.Row="1">
                                    <StackPanel Orientation="Horizontal" FlowDirection="RightToLeft" Margin="5" IsEnabled="{Binding IsCommandEnabled}">
                                        <Button Content="Cancel" HorizontalAlignment="Right"             
                                             Command="{Binding CancelExpansionCommand }"
                                             ToolTip="Revert all local modifications by refreshing data from the controller." />                                                                                                                                  
                                        <Separator Width="10"/>

                                        <Button Content="Apply"  HorizontalAlignment="Center"                         
                                             Command="{Binding ApplyExpansionCommand }"
                                             ToolTip="Apply all changes to the controller." />
                                        <Separator/>
                                    </StackPanel>
                                </DockPanel>

                        </Grid>
                    </DataTemplate>
                    <DataTemplate DataType="{x:Type vms:LogViewModel}">
                        <local:LogView  />
                    </DataTemplate>
                    <DataTemplate DataType="{x:Type vms:SignalStrengthViewModel}">
                        <local:SignalStrengthView  />
                    </DataTemplate>
                </TabControl.Resources>

                <TabControl.ItemContainerStyle>

                    <Style TargetType="{x:Type TabItem}">
                        <Setter Property="Header" Value="{Binding Name}" />
                        <Setter Property="IsEnabled" Value="{Binding IsEnabled}" />
                        <Setter Property="Header" Value="{Binding Name}" />
                    </Style>
                </TabControl.ItemContainerStyle>

编辑：我希望能够调用已更改的凸起属性，并让它刷新我的所有标签视图..

<TabControl IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding DeviceListViewModel.SelectedDevice.TabViewModelsCollection}" SelectedItem="{Binding DeviceListViewModel.SelectedDevice.SelectedTabItemVm}"   >

RaisePropertyChanged("TabViewModelsCollection");

Answer 1

您好，请尝试下一个解决方案：

VM代码编辑

    private State _deviceState;
    private ObservableCollection<object> _tabViewModelsCollection;
    public State DeviceState
    {
        get { return _deviceState; }
        set
        {
            _deviceState = value;
            RaisePropertyChanged("DeviceState");
            UpdateTabViewModelsCollection();
        }
    }

    public ObservableCollection<object> TabViewModelsCollection
    {
        get
        {
            return _tabViewModelsCollection ??
                   (_tabViewModelsCollection = new ObservableCollection<object>(GetDeviceData()));
        }
    }

    private void UpdateTabViewModelsCollection()
    {
        _tabViewModelsCollection = null;
        RaisePropertyChanged("TabViewModelsCollection");
    }

    private List<object> GetDeviceData()
    {
        //implement here the data collection process
        throw new NotImplementedException();
    }

Xaml编辑（定义UpdateSourceTrigger）

    ItemsSource="{Binding DeviceListViewModel.SelectedDevice.TabViewModelsCollection, UpdateSourceTrigger=PropertyChanged}"

让我知道它是否有用。

问候。

特定状态更改时更新TabControl ItemSource ViewModels

1 个答案: