xamarin.forms ListView ItemSelected

Question

我有一个关于ListView元素上的ItemSelected()事件的问题.

我的ListView基于DataTemplate,如下所示:

<ListView.ItemTemplate>
    <DataTemplate>
        <ViewCell>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="0.5*"/>
                    <ColumnDefinition Width="0.5*"/>
                </Grid.ColumnDefinitions>
                <Label Text="{Binding Name}" FontAttributes="Bold" />
                <Button Text="More" Clicked="MoreInfo" c="{Binding Name}"/>
            </Grid>
        </ViewCell>
    </DataTemplate>
</ListView.ItemTemplate>

它获取了一个PlaceItems数组,其结构如下.

private PlaceItem[] places = {
    new PlaceItem("Theo's huis"),
    new PlaceItem("Kerk op de berg"),
    new PlaceItem("Hostel Stay Okay")
};

public class PlaceItem
    {
        public PlaceItem(string Name, double Lat = 0.0, double Lng = 0.0)
        {
            this.Name = Name;
            this.Lat = Lat;
            this.Lng = Lng;
        }

        public string Name { get; set; }
        public string Location { get; set; }
        public double Lat { get; set; }
        public double Lng { get; set; }
    }

这是我的SelectedItem()方法:

placesListView.ItemSelected += (object sender, SelectedItemChangedEventArgs e) =>
{
    DisplayAlert("ItemSelected", e.SelectedItem.ToString(), "Ok");
};

当我选择一个项目时,它总是以字符串"KK2.PlaceItem"发出警告,其中KK2是我的命名空间.那么如何从ListView项目向ItemSelected事件发送数据？就像在Array中发送Item索引一样,或者从对象发送Lat或Lng属性.

我希望我能给你足够的信息来帮助我解决这个问题.Xamarin对我来说很新,但我愿意学习它.

提前致谢.

西奥

Answer 1

placesListView.ItemSelected += (object sender, SelectedItemChangedEventArgs e) =>
{
    var item = (PlaceItem) e.SelectedItem;

    // now you can reference item.Name, item.Location, etc

    DisplayAlert("ItemSelected", item.Name, "Ok");
};