Wpf 无法在复选框中设置所选项目的初始状态

我正在尝试使用Xceed CheckComboBox，除了一个小问题外，它运行良好。最初加载CheckComboBox时，选中的项目列表将正确显示在CheckComboBox的ToggleButton部分，但表示这些项目的复选框不会被选中。这是我正在使用的代码

XAML

<xctk:CheckComboBox x:Name="_combo"  Grid.Row="2" Grid.Column="1" 
                 ItemsSource="{Binding RoomFacilities}" 
                 HorizontalAlignment="Center" 
                 VerticalAlignment="Center"
                 DisplayMemberPath="FacilityName" 
                 SelectedItemsOverride="{Binding SelectedFaclities}" 
                    />

查看模型

public class RoomBandUpdateViewModel : Screen, IHandle<RecordChanged<RoomFacility>>,
                                               IHandle<RecordDeleted<RoomFacility>> {
    private ObservableCollection<RoomFacility> _roomFacilities;
    public ObservableCollection<RoomFacility> RoomFacilities {
        get { return _roomFacilities; }
        set { _roomFacilities = value; NotifyOfPropertyChange(() => RoomFacilities); }
    }

    private ObservableCollection<RoomFacility> _selectedFacilities;
    public ObservableCollection<RoomFacility> SelectedFaclities {
        get { return _selectedFacilities; }
        set { _selectedFacilities = value; NotifyOfPropertyChange(() => SelectedFaclities); }
    }

    protected override void OnActivate() {
        SelectedFaclities = new ObservableCollection<RoomFacility>(RoomBand.Facilities);
        RoomFacilities = new ObservableCollection<RoomFacility>(facilityService.GetAll());
    }
}

public class RoomBand更新设备模型：屏幕，IHandle，
我处理{
私人可观察收集室设施；
公共可观测收集室设施{
获取{return\u roomFacilities；}
设置{u roomFacilities=value；NotifyOfPropertyChange（（）=>roomFacilities）；}
}
私人可观测采集设施；
公共可观测集合选定工厂{
获取{return\u selectedFacilities；}
设置{u selectedFacilities=value；NotifyOfPropertyChange（（）=>selectedFacilities）；}
}
受保护的覆盖无效OnActivate（）{
SelectedFacilities=新的可观测集合（RoomBand.Facilities）；
RoomFacilities=新的ObservableCollection（facilityService.GetAll（））；
}
}

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我想知道为什么在视图模型中正确设置了SelectedFacility时，不会根据SelectedFacility中的项目选中复选框的复选框。有趣的是，CheckComboBox的切换按钮部分在逗号分隔的列表中正确地显示了SelectedFacilities。

如果将集合实例化到类的构造函数中，则该属性尚未绑定到组件，因此，组件不会触发ViewModel的PropertyChanged事件

observable collection Add（）方法没有激发PropertyChanged事件，而是激发CollectionChanged事件

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希望这对您有所帮助

目前尚不清楚您如何填写

selectedfacility

和

roomfacility

。确保已正确处理

RoomFacility

的引用相等。换句话说，我只能重现问题的唯一方法是在以下模式中填充

ObservableCollection

s：

RoomFacilities m1 = new RoomFacilities() { FacilityName = "F1" };
RoomFacilities m2 = new RoomFacilities() { FacilityName = "F2" };
RoomFacilities m3 = new RoomFacilities() { FacilityName = "F3" };
RoomFacilities m4 = new RoomFacilities() { FacilityName = "F1"};
RoomFacilities m5 = new RoomFacilities() { FacilityName = "F2"};
RoomFacilities = new ObservableCollection<RoomFacilities>(new Collection<RoomFacilities>() { m1, m2, m3 });
        SelectedFacilities = new ObservableCollection<RoomFacilities>(new Collection<RoomFacilities>() { m4, m5 });

---

换句话说，

如果
SelectedItemsOverride
不是
项目源的子集，那么
复选框
不会引发异常
您解决过这个问题吗？我也有同样的问题
public override bool Equals(object obj)
{
    if (obj is RoomFacilities)
    {
        RoomFacilities mod = (RoomFacilities)obj;
        if (mod.FacilityName == this.FacilityName)
            return true;
        else
            return false;
    }
    return base.Equals(obj);
}
public override int GetHashCode()
{
    return FacilityName.GetHashCode();
}