Question

我正在尝试使用ListBox的ItemTemplate将属性ObservableCollection<ObservableCollection<Location>>绑定到ListBox，而ListBox的ItemTemplate又是一个GridTemplate，它是一个网格。列表框中列表框的布局似乎工作正常。但是，我的数据绑定存在问题。

对于第二层列表框ItemsSource，我尝试使用Collection Current Item Bindings ItemSource="{Binding /}"并使用ItemsSource="{TemplateBinding /}"进行绑定。我是WPF的新手，并且正在使用MVVM，所以任何提示和/或批评都会受到赞赏。

<ListBox Grid.Row="4" Width="610" Height="600" HorizontalContentAlignment="Stretch" ItemsSource="{Binding CurrentLocation.Children}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ListBox Width="550" Height="100" Margin="5"   HorizontalContentAlignment="Stretch"  ItemsSource="{Binding /}" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid HorizontalAlignment="Stretch" Margin="5">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="3*" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="*" />
                            </Grid.RowDefinitions>
                            <TextBlock Grid.Column="0" Grid.Row="0" Margin="5" Text="Name:" />
                            <TextBlock Grid.Column="0" Grid.Row="1" Margin="5" Text="Description:" />
                            <TextBlock Grid.Column="1" Grid.Row="0" Margin="5" Text="{Binding Name}" />
                            <TextBlock Grid.Column="1" Grid.Row="1" Margin="5" Text="{Binding Description}" TextWrapping="Wrap" />
                            <Button Grid.Column="2" Grid.Row="0" Command="{Binding TODO}">
                                <TextBlock Text="Edit"/>
                            </Button>
                            <Button Grid.Column="2" Grid.Row="1" Command="{Binding TODO}">
                                <TextBlock Text="Delete"/>
                            </Button>
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Answer 1

作为整体绑定到当前DataContext的正确表示法是{Binding}。

<ListBox ... ItemsSource="{Binding CurrentLocation.Children}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ListBox ... ItemsSource="{Binding}" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid HorizontalAlignment="Stretch" Margin="5">
                            <!-- snip -->
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Answer 2

每个ListBoxItem都包含父集合中对象的DataContext，因此您可以在Binding中指定任何内容。

<ListBox ItemsSource="{Binding MyCollectionOfCollections}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <!-- DataContext of each item will an inner ObservableCollection<Location> -->
            <ListBox ItemsSource="{Binding }" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

列表框的ListBox绑定到集合集合

2 个答案: