获取有关单击了哪个图钉的信息
本文关键字:信息 单击 获取 | 更新日期: 2023-09-27 18:29:17
我正在构建一个windows phone 8.1应用程序,该应用程序读取一个文件(其中包含GPS点,每个点由例如纬度和经度字段组成)。对于每个点,我都有它,所以它在地图控件上显示一个小图钉图标,基于上面文件中的坐标。我想让图钉可以点击,最终目标是获得用户点击的点的纬度和经度,并根据点击的点进行适当的操作。我怎样才能得到这些信息?这是我尝试过的,但不起作用:
private async void Image_Tapped(object sender, TappedRoutedEventArgs e)
{
var point = sender as Geopoint;
MessageDialog msgbox = new MessageDialog("point tapped: " + point.Position.Latitude );
await msgbox.ShowAsync();
}
这是我的模板:
<Maps:MapControl x:Name="myMap">
<Maps:MapItemsControl ItemsSource="{Binding }">
<Maps:MapItemsControl.ItemTemplate>
<DataTemplate>
<Image Source="Assets/pushpin.png" Tapped="Image_Tapped" Width="50" Height="50" Maps:MapControl.Location="{Binding}"></Image>
</DataTemplate>
</Maps:MapItemsControl.ItemTemplate>
</Maps:MapItemsControl>
</Maps:MapControl>
这是我用来读取文件和显示图钉的东西(它显示它们很好)
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
Geoposition position = await App.DataModel.GetCurrentPosition();
await myMap.TrySetViewAsync(position.Coordinate.Point, 16D);
List<Geopoint> list = new List<Geopoint>();
bool exist; // used to check if JSON file exists
exist = await App.DataModel.FileExistsAsync();
if (exist == true)
{
// read the file and load points into a list
await App.DataModel.ReadFile();
foreach (var point in App.DataModel.notes)
{
Geopoint geo = new Geopoint(new BasicGeoposition()
{
Latitude = point.Latitude,
Longitude = point.Longitude
});
list.Add(geo);
}
}
myMap.DataContext = list;
}
在Image_Tapped
处理程序中,sender变量不是Geopoint
,而是Image
。但是Geopoint
应该是该图像的DataContext
var point = (sender as Image).DataContext as Geopoint;