Question

我有一个ItemsControl。

    <DockPanel Height="280">
        <Border CornerRadius="6" BorderBrush="Gray" Background="LightGray" BorderThickness="2" >
            <ScrollViewer VerticalScrollBarVisibility="Auto">
                <ItemsControl Height="400" Name="icTodoList" ItemsSource="{Binding Items}">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <Grid Name="ToDoList">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <TextBlock Text="{Binding StartTime, FallbackValue=' '}" Grid.Row="0"/>
                                <TextBlock Text="{Binding ConnectedTime, FallbackValue=' '}" Grid.Row="1"/>
                                <TextBlock Text="{Binding DisconnectedTime, FallbackValue=' '}" Grid.Row="2"/>
                                <TextBlock Text="{Binding DialingResult, FallbackValue=' '}" Grid.Row="3"/>
                            </Grid>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </ScrollViewer>
        </Border>
    </DockPanel>

在我的MainViewModel.cs中，我有：

    public class MainViewModel : NotifyUIBase
    public ObservableCollection<Calls> items = new ObservableCollection<Calls>();
    public ObservableCollection<Calls> Items
    {
        get { return items; }
        set
        {
            items = value;
            RaisePropertyChanged();
        }
    }

和

 public class NotifyUIBase : INotifyPropertyChanged
 {
    // Very minimal implementation of INotifyPropertyChanged matching msdn
    // Note that this is dependent on .net 4.5+ because of CallerMemberName
    public event PropertyChangedEventHandler PropertyChanged;
    public void RaisePropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

然后在我的代码背后： MainViewModel _dataContext;

    public MainWindow()
    {
        InitializeComponent();
        _dataContext = new MainViewModel();
        this.DataContext = _dataContext;


Dictionary<string, string> dict = new Dictionary<string, string>();
dict = RunScript();
Calls c = new Calls();
c.StartTime = dict["StartTime"];
c.ConnectedTime = dict["ConnectedTime"];
c.DisconnectedTime = dict["DisconnectedTime"];
c.DialingResult = dict["DialingResult"] + '\n';
Dispatcher.BeginInvoke((Action)delegate()
{
    if (c != null)
        _dataContext.Items.Add(c);
});

编辑：

要添加通话，我在异步ActionBlock方法中使用了Task。

var actionBlock = new ActionBlock<T>(
t=>
  {
        Dictionary<string, string> dict = new Dictionary<string, string>();
        dict = RunScript(t);
        Calls c = new Calls();
        // get c from dict
         Dispatcher.BeginInvoke((Action)delegate()
         {
             if (c != null)
              _dataContext.Items.Add(c);
     });
      },
         executionDataflowBlockOptions);
        // link a BufferBlock to this ActionBlock
           await actionBlock.Completion;

假设我有100个调用，屏幕上的预期输出应该有100个数据集。我确信它们不是空的。但是它只显示6个数据集，为什么？

Answer 1

最后，一个ItemsControl与ScrollViewer不能很好地工作，这就是我没有看到所有项目的原因。通过删除ScrollViewer元素并通过设置其Template属性将其添加到ItemsControl的控件模板：

<DockPanel Height="280">
        <Border CornerRadius="6" BorderBrush="Gray" Background="LightGray" BorderThickness="2" >
            <ItemsControl Name="icTodoList" ItemsSource="{Binding Items}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Grid Name="ToDoList">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="*"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>
                            <TextBlock Text="{Binding StartTime, FallbackValue=' '}" Grid.Row="0"/>
                            <TextBlock Text="{Binding ConnectedTime, FallbackValue=' '}" Grid.Row="1"/>
                            <TextBlock Text="{Binding DisconnectedTime, FallbackValue=' '}" Grid.Row="2"/>
                            <TextBlock Text="{Binding DialingResult, FallbackValue=' '}" Grid.Row="3"/>
                        </Grid>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
                <ItemsControl.Template>
                    <ControlTemplate>
                        <ScrollViewer x:Name="ScrollViewer" Padding="{TemplateBinding Padding}">
                            <ItemsPresenter />
                        </ScrollViewer>
                    </ControlTemplate>
                </ItemsControl.Template>
            </ItemsControl>
        </Border>
    </DockPanel>

为什么ItemsControl不显示所有

1 个答案: