c# - ObservableCollection 不更新项目源

Question

我有一个从网络线程填充的可观察集合。如果使用虚拟数据从构造函数填充 OC，它会显示在 UI 上。我知道项目正在从网络线程添加到集合中，但项目计数永远不会在 UI 上更新。

我的 View 模型如下:

public class ManikinStatusViewModel : DiViewModelBase
{
    private readonly ICommunicationService manikinCommunicationService;

    #region Properties
    public ObservableCollection<CasualtyStatusViewModel> Manikins { get; private set; }
    #endregion

    public ManikinStatusViewModel()
    {
        Manikins = new ObservableCollection<CasualtyStatusViewModel>();

        uow = UnitOfWorkFactory.Instance.CreateRunScenarioUnitOfWork(false);

        AccelermeterPacketData apd = new AccelermeterPacketData(56, 57, 58);

        manikinCommunicationService = new TestingCommunicationService(LoadAnalogSensorData(), apd);
        manikinCommunicationService.ManikinDataReceived += ManikinCommunicationService_ManikinDataReceived;

    }

    #region Events
    private void ManikinCommunicationService_ManikinDataReceived(object sender, ManikinDataReceivedEventArgs e)
    {
        if (e.ManiknDataPacket != null)
        {
            var manikin = Manikins.ToList().Find(m => m.ManikinId == e.ManiknDataPacket.SerialNumber);

            if (manikin == null)
            {
                Debug.WriteLine("Creating manikin with serial number: " + e.ManiknDataPacket.SerialNumber);

                CasualtyStatusViewModel csvm = new CasualtyStatusViewModel(e.ManiknDataPacket.SerialNumber);
                Manikins.Add(csvm);

                manikin = csvm;

                Debug.WriteLine("manikin count is: " + Manikins.Count());

            }

            manikin.UpdateManikinStatus(e.ManiknDataPacket);
        }
    }

    #endregion

我将人体模型集合绑定(bind)到以下 View 。

   <TabControl Grid.Row="1" ItemsSource="{Binding Manikins}" Name="ManikinsTabControl">
        <TabControl.Resources>
            <Style TargetType="TabItem">
                <Setter Property="Header" Value="Casualty"></Setter>
                <Setter Property="ContentTemplate" Value="{StaticResource CasualtyTemplate}"></Setter>
            </Style>
        </TabControl.Resources>
    </TabControl>

Answer 1

您必须在 View 模型中更新集合时引发 PropertyChanged 事件 并且您的 View 模型必须实现 INotifyPropertyChanged