c# - 尝试绑定(bind) XAML 数据时出现异常

Question

我正在制作一个关于体育新闻的简单应用程序。问题是，然后我尝试绑定(bind)数据时出现此错误:

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll Additional information: Items collection must be empty before using ItemsSource.

这是 xaml 代码:

<ListView Name="ListBoxWithNews" ItemsSource="{Binding News}" Grid.Row="1" Grid.Column="1"  Grid.RowSpan="2" Grid.ColumnSpan="2">
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding imageURL}" Width="75" Height="75" />
                <StackPanel>
                    <TextBlock Text="{Binding Title}" Width="200" />
                    <TextBlock Text="{Binding Body}" Width="200" />
                </StackPanel>
            </StackPanel>
        </ListView>

我这样设置数据上下文:

private void EnglandNews_Click(object sender, RoutedEventArgs e)
        {
            NewsModelView model = new NewsModelView("http://topsport.ibox.bg/rss_18");
            this.DataContext = model;
        }

有什么问题可能是什么建议吗？

Answer 1

您需要将 StackPanel 包装在 DataTemplate 中:

<ListView Name="ListBoxWithNews" ItemsSource="{Binding News}" Grid.Row="1" Grid.Column="1"  Grid.RowSpan="2" Grid.ColumnSpan="2">
    <ListView.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding imageURL}" Width="75" Height="75" />
                <StackPanel>
                    <TextBlock Text="{Binding Title}" Width="200" />
                    <TextBlock Text="{Binding Body}" Width="200" />
                </StackPanel>
            </StackPanel>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

如果不使用 ItemTemplate.DataTemplate，您实际上会在基本标记的列表中获得项目。