我想给出 ViewModel 的经度和纬度。
现在我正在使用:-
private void button1_Click(object sender, RoutedEventArgs e)
{
Pushpin p = new Pushpin();
p.Background = new SolidColorBrush(Colors.Yellow);
p.Foreground = new SolidColorBrush(Colors.Black);
p.Location = new GeoCoordinate(double.Parse(longitude.Text), double.Parse(latitude.Text));//Longitude and Latitude
p.Content = "I'm here";//To show the place where it is located
map1.Children.Add(p);
map1.SetView(new GeoCoordinate(double.Parse(longitude.Text), double.Parse(latitude.Text), 200), 9);
}
我的 Xaml 是:-
<Grid x:Name="MapPageUIContainer" Grid.Row="1" Margin="2,0,2,0">
<my:Map CopyrightVisibility="Collapsed" LogoVisibility="Collapsed" CredentialsProvider="" Mode="AerialWithLabels" Height="543" HorizontalAlignment="Left" Name="map1" VerticalAlignment="Top" Width="480" Margin="2,100,0,0" />
<Border BorderBrush="Silver" BorderThickness="1" Height="100" HorizontalAlignment="Left" Margin="0,0,0,0" Name="border1" VerticalAlignment="Top" Width="476" Background="#FFA3A371">
<TextBlock Text="Map Example" HorizontalAlignment="Center" FontSize="32" FontWeight="Bold" VerticalAlignment="Center" />
</Border>
<TextBox Height="72" HorizontalAlignment="Left" Margin="6,627,0,0" Name="longitude" Text="" VerticalAlignment="Top" Width="200" />
<TextBox Height="72" HorizontalAlignment="Left" Margin="260,627,0,0" Name="latitude" Text="" VerticalAlignment="Top" Width="200" />
<Button Content="Set" HorizontalAlignment="Left" Margin="190,690,0,0" Name="button1" VerticalAlignment="Top" Click="button1_Click" />
</Grid>
在这里,我想从 View 模型中给出图钉、经度、纬度。请告诉我如何实现这一目标?
提前致谢..
我已经尝试过这样的..
public class MapPageViewModel : ReactiveObject
{
public static string _longitude;
public string longitude
{
get { return _longitude; }
set { this.RaiseAndSetIfChanged(x => x.longitude, value); }
}
public static string _latitude;
public string latitude
{
get { return _latitude; }
set { this.RaiseAndSetIfChanged(x => x.latitude, value); }
}
public ReactiveAsyncCommand setButton { get; set; }
public MapPageViewModel()
{
setButton = new ReactiveAsyncCommand();
setButton.Subscribe(x => {
Pushpin p = new Pushpin();
p.Background = new SolidColorBrush(Colors.Yellow);
p.Foreground = new SolidColorBrush(Colors.Black);
p.Location = new GeoCoordinate(double.Parse(longitude), double.Parse(latitude));
p.Content = "I'm here";//To show the place where it is located
//map1.Children.Add(p);
//map1.SetView(new GeoCoordinate(double.Parse(longitude), double.Parse(latitude), 200), 9);
});
}
}
但我不知道如何设置map1.Children.Add()和map1.SetView以及如何在Map中绑定(bind)这些值?
嗨克莱门斯。我已经尝试过你的指导。但它显示错误。
我也尝试过这个:-
public MapPageViewModel()
{
PushpinItems = new ObservableCollection<PushpinItem>();
PushpinItem pp = new PushpinItem();
setButton = new ReactiveAsyncCommand();
setButton.Subscribe(x => {
pp.Location = new GeoCoordinate(double.Parse(longitude), double.Parse(latitude));
pp.Text = "I'm here";
PushpinItems.Add(pp);
});
}
但是这里发生运行时错误。请让我知道我哪里做错了。
最佳答案
在正确的 MVVM 方法中,您通常会拥有一个带有用于图钉的 ItemTemplate
的 MapItemsControl
,并将其绑定(bind)到图钉的 ObservableCollection
View 模型中的数据项:
public class PushpinItem
{
public GeoCoordinate Location { get; set; }
public string Text { get; set; }
}
public class MapPageViewModel : ReactiveObject
{
public ObservableCollection<PushpinItem> PushpinItems { get; set; }
...
public MapPageViewModel()
{
PushpinItems = new ObservableCollection<PushpinItem>();
setButton = new ReactiveAsyncCommand();
setButton.Subscribe(x =>
{
PushpinItems.Add(new PushpinItem
{
Location = new GeoCoordinate(...),
Text = ...
});
});
}
}
XAML:
<map:Map ...>
<map:MapItemsControl ItemsSource="{Binding PushpinItems}">
<map:MapItemsControl.ItemTemplate>
<DataTemplate>
<map:Pushpin Location="{Binding Location}" Content="{Binding Text}"
Background="Yellow" Foreground="Black"/>
</DataTemplate>
</map:MapItemsControl.ItemTemplate>
</map:MapItemsControl>
</map:Map>
关于c# - 如何在 Windows Phone 7 中的 bing map 中从 ViewModel 设置经度和纬度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22610214/