我有绑定到ComboBoxObservableCollection

<ComboBox x:Name="comboMeetingWeek" ItemsSource="{Binding Meetings}"
    SelectedItem="{Binding Meeting, UpdateSourceTrigger=PropertyChanged}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <Image Source="Images/Bell.png" Margin="0,0,5,0"
                       Visibility="{Binding DisplayBellImage, Converter={StaticResource BoolToHiddenConverter}}" Stretch="None"/>
                <TextBlock Text="{Binding DateMeetingAsText}" />
            </StackPanel>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>


我正在执行的这个ContextMenu(正在进行的工作):

<Image Grid.Column="1" HorizontalAlignment="Right" Source="Images\event_time.png" Margin="2">
    <Image.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Set Special Event" Command="{Binding SetSpecialEventCommand, Mode=OneWay}"/>
            <MenuItem Header="Edit Special Event" Command="{Binding EditSpecialEventCommand, Mode=OneWay}"/>
            <MenuItem Header="Remove Special Event">
                <MenuItem.Style>
                    <Style TargetType="MenuItem">
                        <Setter Property="IsEnabled" Value="False"/>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Meeting.IsSpecialEvent}" Value="True">
                                <Setter Property="IsEnabled" Value="True"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </MenuItem.Style>
            </MenuItem>
        </ContextMenu>
    </Image.ContextMenu>
</Image>


现在暂时忽略删除特殊事件。

这是两个关联的命令:

_SetSpecialEventCommand = new DelegateCommand<string>(
    (s) =>
    {
        SpecialEventWindow windowEvent = new SpecialEventWindow();
        windowEvent.DataContext = this;
        windowEvent.ShowDialog();
        if (windowEvent.DialogResult.HasValue && windowEvent.DialogResult.Value)
            _Meeting.IsSpecialEvent = true;
    },
    (s) => !_Meeting.IsSpecialEvent);

_EditSpecialEventCommand = new DelegateCommand<string>(
    (s) =>
    {
        SpecialEventWindow windowEvent = new SpecialEventWindow();
        windowEvent.DataContext = this;
        windowEvent.ShowDialog();
        if (windowEvent.DialogResult.HasValue && windowEvent.DialogResult.Value)
            _Meeting.IsSpecialEvent = true;
        else
            _Meeting.IsSpecialEvent = false;
    },
    (s) => _Meeting.IsSpecialEvent);


并且,以便ContextMenu下次可以正确设置菜单状态:

public Data.MeetingInfo.Meeting Meeting
{
    get { return _Meeting; }
    set
    {
        // Has the existing meeting object changed at all?
        if(_Meeting != null && _Meeting.IsDirty)
        {
            // Yes, so save it
            _Model.Serialize();
            _Meeting.MarkClean();
        }

        // Now we can update to new value
        if (value != null)
        {
            _Meeting = value;
            OnPropertyChanged("Meeting");
            _SetSpecialEventCommand.RaiseCanExecuteChanged();
            _EditSpecialEventCommand.RaiseCanExecuteChanged();
        }
    }
}
private Data.MeetingInfo.Meeting _Meeting;


因此,我的上下文菜单现在始终与当前组合菜单项的状态匹配。

但是,当我将组合项目设置为以前没有的事件时,该组合项目不会更新并添加图像。我决定将ItemSource设置为也有一个UpdateTriggerSource=PropertyChanged

然后,我调整了监听事件处理程序:

private void Meeting_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    OnPropertyChanged(e.PropertyName);

    if (e.PropertyName == "IsSpecialEvent" || e.PropertyName == "IsCircuitVisit")
        OnPropertyChanged("Meetings");
}


但这是行不通的。列表现在使用图标显示它,但不显示当前项目本身。

c# - 所选的ComboBoxItem图片未更改-LMLPHP

c# - 所选的ComboBoxItem图片未更改-LMLPHP

我想走哪一步?

为了看到它,我必须选择另一个菜单项,然后再回到它。

谢谢。

更新资料

我更改了两个模型属性:

[XmlIgnore]
public bool IsSpecialEvent
{
    get { return _SpecialEvent.Event; }
    set
    {
        _SpecialEvent.Event = value;
        MarkDirty();
        OnPropertyChanged("IsSpecialEvent");
        OnPropertyChanged("DisplayBellImage");
    }
}

[XmlIgnore]
public bool IsCircuitVisit
{
    get { return _SpecialEvent.CircuitVisit; }
    set
    {
        _SpecialEvent.CircuitVisit = value;
        MarkDirty();
        OnPropertyChanged("IsCircuitVisit");
        OnPropertyChanged("DisplayBellImage");
    }
}


他们现在还触发了DisplayBellImage,一切似乎都很好。但是我确实需要像以前那样更新ItemSource,对吗?

最佳答案

钟形图像的可见性似乎由称为DisplayBellImage的属性的值驱动。我看不到您曾经更改过该属性的值,也没有提高它的PropertyChanged。每当OnPropertyChanged("DisplayBellImage");的值更改时,您都应该调用DisplayBellImage

10-04 18:05