当树视图项被选中时，如何显示列表框项

本文关键字：何显示 显示 列表 视图 | 更新日期: 2023-09-27 18:16:53

所以我有一个为学校构建邮件应用程序的任务。我有一个零件出了问题。

有一个TreeView和一个ListBox。TreeView有几个项目在它(收件箱，垃圾，草稿)。现在我要做的是，当我选择和TreeView项目某些ListBox项目将出现在ListBox。(ListBox的目的是显示该"文件夹"中的邮件)。

我一直在研究这个，有一些建议与ListAray和DataBinding，但我是非常新的，不知道如何实现这些。

我现在得到的是:

<TreeView Grid.Row="2" Grid.ColumnSpan="1" VerticalAlignment="Stretch" HorizontalAlignment="Left" Margin="10,10,0,10"  Name="treeView1" Width="100" FontSize="14" SelectedItemChanged="treeView1_SelectedItemChanged">
    <TreeViewItem Header="Prejeto" IsSelected="True">
        <TreeViewItem Header="Prebrano" />
        <TreeViewItem Header="Neprebrano" />
    </TreeViewItem>
    <TreeViewItem Header="Poslano" />
    <TreeViewItem Header="Osnutki" />
    <TreeViewItem Header="Izbrisano" />
    <TreeViewItem Header="Nezaželeno" />
    <TreeViewItem />
</TreeView>
XAML ListBox: 
<ListBox Name="seznamSporocil" Grid.Column="1" Grid.Row="2"  HorizontalAlignment="Left" Margin="10,10,0,10"  VerticalAlignment="Stretch" Width="100" FontWeight="Bold" FontFamily="Arial" MouseDoubleClick="seznamSporocil_MouseDoubleClick" />

SelectedItemChanged:

private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
}

当树视图项被选中时，如何显示列表框项

在使用WPF时，数据绑定是您最好的朋友。只需将列表框的ItemsSource与树视图选定项的一些集合属性绑定。

。

下面是完整的示例(只需创建WPF应用程序项目)。模型:
public class MailFolder
{
    public string Name { get; set; }
    public ObservableCollection<MailItem> Items
    {
        get
        {
            return items ?? (items = new ObservableCollection<MailItem>());
        }
    }
    private ObservableCollection<MailItem> items;
    public ObservableCollection<MailFolder> SubFolders
    {
        get
        {
            return subFolders ?? (subFolders = new ObservableCollection<MailFolder>());
        }
    }
    private ObservableCollection<MailFolder> subFolders;
}
public class MailItem
{
    public string Subject { get; set; }
}
XAML: 

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication1"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <TreeView x:Name="MailTreeView" ItemsSource="{Binding}">
            <TreeView.Resources>
                <HierarchicalDataTemplate DataType="{x:Type local:MailFolder}" ItemsSource="{Binding SubFolders}">
                    <TextBlock Text="{Binding Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.Resources>
        </TreeView>
        <ListBox Grid.Column="1" ItemsSource="{Binding Path=SelectedItem.Items, ElementName=MailTreeView}">
            <ListBox.ItemTemplate>
                <DataTemplate DataType="{x:Type local:MailItem}">
                    <TextBlock Text="{Binding Subject}"/>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

这是数据上下文设置:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new[] 
        {
            new MailFolder
            {
                Name = "Prejeto",
                SubFolders = 
                {
                    new MailFolder
                    {
                        Name = "Prebrano",
                        Items = 
                        {
                            new MailItem { Subject = "A" },
                            new MailItem { Subject = "B" },
                            new MailItem { Subject = "C" },
                        }
                    },
                    new MailFolder
                    {
                        Name = "Neprebrano",
                        Items = 
                        {
                            new MailItem { Subject = "D" },
                            new MailItem { Subject = "E" },
                        }
                    },
                },
                Items = 
                {
                    new MailItem { Subject = "M" },
                    new MailItem { Subject = "N" },
                }
            },
            new MailFolder
            {
                Name = "Poslano",
                Items = 
                {
                    new MailItem { Subject = "F" },
                    new MailItem { Subject = "G" },
                }
            },
            new MailFolder
            {
                Name = "Osnutki",
                Items = 
                {
                    new MailItem { Subject = "H" },
                }
            },
            new MailFolder
            {
                Name = "Izbrisano",
                Items = 
                {
                    new MailItem { Subject = "I" },
                    new MailItem { Subject = "J" },
                    new MailItem { Subject = "K" },
                }
            },
            new MailFolder
            {
                Name = "Nezaželeno",
                Items = 
                {
                    new MailItem { Subject = "L" },
                }
            }
        };
    }
}

注意，如果您想要反映对模型类的属性所做的更改，您需要实现INotifyPropertyChanged接口。

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