Question

我有一个用户控件列表框，每个usercontrol显示有界数据的属性，并在自定义控件更改数据时未将UI更新，我的代码如下所示，将集合绑定到自定义控件：

ObservableCollection<Subscription> subscriptions = new ObservableCollection<Subscription> SubscriptionRepository.GetSubscriptions());
            SubListBox.ItemsSource = subscriptions;

xaml：

<DataTemplate x:Key="MyDataTemplate">
            <UserControls:SubscriptionUC />
</DataTemplate>

<ListBox x:Name="SubListBox" ItemTemplate="{StaticResource MyDataTemplate}">
</ListBox>

用户控制：

    <TextBlock Text="{Binding Path=DaysAttended}" />
<cc:CustomControl SubscriptionSource="{Binding Path=SubscriptionDays,Mode=TwoWay}" />

订阅类：

public class Subscription : INotifyPropertyChanged
    {
        public int SubscriptionTypeId { get; set; }

        public DateTime StartDate { get; set; }

        public DateTime EndDate { get; set; }

        public ObservableCollection<SubscriptionDay> SubscriptionDays { get; set; }

        public int DaysAttended { get { return SubscriptionDays.Count(d => d.Attended == true); } }
public void DayChanged()
        {
            RaisePropertyChanged("SubscriptionDays");
            RaisePropertyChanged("DaysAttended");
        }
 }

当SubscriptionDay属性发生更改并且调用它但没有更新DaysAttended时，从SubscriptionDay类调用DayChanged（）。

Answer 1

DaysAttended 属性还需要 setter ，对于双向绑定，您的属性必须具有getter和setter。我希望这会有所帮助。< / p>

属性更改时，嵌套集合不更新UI

1 个答案: