Question

这是我的.xml文件-listview的一部分，其中标签从API获取数据。当我单击一项时，我需要获取其“标题”和/或“日期”的值。

ListView x:Name="listViewStories" Margin="12,0,12,0">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <StackLayout Orientation="Horizontal">
                            <Label x:Name="titleOfStory" 
                                Text="{Binding Title}" 
                                   TextColor="Black"
                                   FontSize="20"
                                   WidthRequest="180">
                            </Label>
                            <Label x:Name="dateOfStory" 
                                Text="{Binding Date}" 
                                   TextColor="Black"
                                   FontSize="20"
                                   WidthRequest="180"></Label>
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

这是我的.cs文件，我仅以DisplayAlert代码为例，以便获取值，我尝试了其他方法，但找不到解决方法：

[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ReadYourPastPage : ContentPage
{
    HttpClient client = new HttpClient();
    string _ID;

    public ReadYourPastPage(string id)
    {
        InitializeComponent();
        _ID = id;
        GetStories();


        listViewStories.ItemTapped += ListViewStories_ItemTapped;
    }

    private void ListViewStories_ItemTapped(object sender, ItemTappedEventArgs e)
    {
        DisplayAlert("I need here to show Title or Date ->", e.Item.ToString() , "Cancel");
    }

    public async void GetStories()
    {
        var response = await client.GetStringAsync(returnJSON.GetURL() +
            "index.php?IDuser=" + _ID +
            "&getStories");

        var stories = JsonConvert.DeserializeObject<List<Story>>(response);
        listViewStories.ItemsSource = stories;
    }
}

Answer 1

ItemTapped和ItemSelected事件使您返回与当前Listview单元格关联的绑定上下文。我建议使用ItemSelected事件而不是ItemTapped。在这种情况下，您可以使用以下代码获取对象：

private void ListViewStories_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
    // This line null checks the object and also gives you a reference
    if (e.SelectedItem is Story story)
    {
        DisplayAlert($"Title -> {story.Title}   Date -> {story.Date}", "Cancel");

        // Deselect the cell that was tapped
        listViewStories.SelectedItem = null;
    }
}

您无法在后面的.cs代码中引用ViewCell。您只能访问绑定上下文

XAMARIN：我的Listview中有两个标签，我需要在.cs中获取它们的文本，但无法通过x：Name访问它们

1 个答案: