如何绑定来自多个模型的Bing图钉? [英] how can I bind Bing Pushpins from multiple models?

问题描述

我在WP7应用程序中要求从多个数据源在bing映射上显示图钉，但我不确定做到这一点的最佳方法.

I have the requirement in my WP7 application to display pushpins on a bing map from multiple data sources and I am not sure of the best way to do this.

例如，可能是这样，我从Web服务接收到人员列表，建筑物列表，POI列表等.我需要在他们自己的视图中分别显示它们，但还要显示它们在每种类型具有不同图像的地图上.

So for example it would be something like this, I receive from a web service a list of people, a list of buildings, a list of POIs etc. I would need to display these individually in their own views but also display them on a map with different images for each type.

我正在尝试使用MVVM方法，因此有一个用于Person的类，一个用于建筑物的类，依此类推，每个类都有一个位置.然后，我为每种类型都有一个ObservableCollection，因此使用数据绑定很容易为每种类型进行View.

I am trying to use a MVVM approach so have a class for a Person, class for a building and so on, each one of these has a location. I then have an ObservableCollection for each of these types and so using data binding it is easy enough to do a View for each of these.

目前，我只有一个ViewModel，但我首先想到的是，我认为每个类型实际上应该有一个ViewModel.那么PersonViewModel，BuildingViewModel在这里?但是，地图视图随后需要从每个视图中获取信息，而且我不确定如何将一个视图绑定到这样的多个ViewModel上，即使这是明智的.

At the moment I only have one ViewModel but my first thought is that I think I should really have one ViewModel per type. So PersonViewModel, BuildingViewModel here? However a Map View would then need to take information from each of these views and I am no sure how you bind a view to multiple ViewModels like this or even if that is sensible.

MapItemsControl似乎也只能绑定到一件事，所以我如何将其绑定到多个不同的数据源呢?我以为我可以创建一个简单的图钉类，但是那意味着要复制每种类型的数据，我最终希望能够单击图钉以显示图钉的详细信息，因此希望将类型分开

MapItemsControl also only seems to be able to bind to one thing so how can I bind it to multiple different data sources like this? I thought I could create a simple pushpin class but that would then mean having the data for each type duplicated and I eventually want to be able to click on the pushpins to display the details for the pin so wanted to keep the types separate

对前进道路上的任何指针都表示赞赏

Any pointers on a way forward much appreciated

推荐答案

使用MapItemsControl是您所说的方式.这很容易.正如您所说的，您想要的是一个ViewModel，其中每个类型都有一个ObservableCollection.

Using a MapItemsControl is as you say, the way to do it. And it's very easy. What you want is a ViewModel with a ObservableCollection for each of your types, as you say you already have.

所以我想您的问题是您不了解如何使用样式和ItemTemplates.

So I guess your problem is that you don't understand how to use Styles and ItemTemplates.

如果要对每种不同的类型使用相同的样式，则只需定义一个适用于每个MapItemsControl.ItemTemplate的公共ItemTemplate.同样，如果需要的话，您可以定义一种自定义样式，将其全局应用到每个图钉.

If what you want, is to have the same style for each of the different types, then simply define a common ItemTemplate that you apply to each MapItemsControl.ItemTemplate. Likewise you can define a custom style that you apply to each Pushpin globally, if what's what you want.

<Grid.Resources>
    <DataTemplate x:Name="PushpinItemTemplate">
        <maps:Pushpin Location="{Binding Location}" Tap="Pushpin_Tap" Style="{StaticResource PushpinStyle}" />
    </DataTemplate>
</Grid.Resources>

...

<maps:Map>
    <maps:MapLayer>
        <maps:MapItemsControl ItemsSource="{Binding People}" ItemTemplate="{StaticResource PushpinItemTemplate}" />
        <maps:MapItemsControl ItemsSource="{Binding Buildings}" ItemTemplate="{StaticResource PushpinItemTemplate}" />
    </maps:MapLayer>
</maps:Map>

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