Question

我有Grouped ListView，现在我需要访问该组中的项目，当我点击组列表中的项目时，我需要获得该项目的特定细节，

 <ListView x:Name="DishesList" ItemsSource ="{Binding Details}" SeparatorVisibility="None" HasUnevenRows="true" ItemTapped = "OnItemSelected" IsGroupingEnabled="True" >
            <ListView.GroupHeaderTemplate>
                <DataTemplate>
                    <ViewCell>
                        <Grid Padding ="10" BackgroundColor="Transparent">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <StackLayout Grid.Column= "1">
                                <Label Text ="{Binding Name}" TextColor ="#007aff" HorizontalTextAlignment="Center" VerticalTextAlignment="Center">
                                </Label>
                            </StackLayout>
                        </Grid>
                    </ViewCell>
                </DataTemplate>
            </ListView.GroupHeaderTemplate>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <StackLayout Padding = "1" Spacing = "0" BackgroundColor="Transparent">
                            <Image x:Name="DishImage" Source = "{Binding DishImage}" HeightRequest="60" />
                            <Label x:Name="DishName" Text ="{Binding DishName}" TextColor ="#007aff" HorizontalTextAlignment="Center" VerticalTextAlignment="Center">

                            </Label>
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

        private async void OnItemSelected(object sender, SelectedItemChangedEventArgs eventArgs)
            {
 var selectedItem = (DishesModel)eventArgs.SelectedItem;
                 //How can I access the data of the Particular item?,Iam getting all the items which are present in that group but i need to get one among them on which  clicked.
            }

Answer 1

如果您需要选择项目，请在XAML中使用 ItemSelected 代替 ItemTapped 。

你需要点击项目，然后将 SelectedItemChangedEventArgs 更改为 ItemTappedEventArgs ，将 eventArgs.SelectedItem 更改为 eventArgs.Item XAML.CS

Answer 2

在ListView.ItemTemplate的{{1}}内添加DataTemplate，其中包含其包含的页面作为绑定源，并提供实现TapGestureRecognizer的绑定路径{1}}点击组中的项目时要调用的内容，最后将ICommand设置为绑定到自身（即组内的项目）。

类似的东西：

Command

实施例

XAML：

CommandParameter

型号：

<ContentView.GestureRecognizers>
    <TapGestureRecognizer Command="{Binding Source={x:Reference theContainingPage}, Path=BindingContext.TapCommand}" CommandParameter="{Binding .}"/>
</ContentView.GestureRecognizers>

该页面上的

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="Forms_App_Project.Views.GroupListTapExample" x:Name="theContainingPage"> <ContentPage.Content> <ListView ItemsSource="{Binding ListOfItems}" IsGroupingEnabled="true"> <ListView.GroupHeaderTemplate> <DataTemplate> <ViewCell> <Label Text="{Binding Heading}" /> </ViewCell> </DataTemplate> </ListView.GroupHeaderTemplate> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <ContentView> <Label Text="{Binding Name}" /> <ContentView.GestureRecognizers> <TapGestureRecognizer Command="{Binding Source={x:Reference theContainingPage}, Path=BindingContext.TapCommand}" CommandParameter="{Binding .}"/> </ContentView.GestureRecognizers> </ContentView> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView> </ContentPage.Content> </ContentPage>：

public class Item
{
    public string Name { get; set; }
}

public class GroupedItems : List<Item>
{
    public string Heading { get; set; }
    public List<Item> Items => this;
}

如何在分组列表中获取所选项目查看

2 个答案:

实施例

XAML：

型号：