如何在UWP C#中从ContentPresenter DataTemplate中获取MapControl

Question

我有一个ContentPresenter，并为其ContentTemplate属性分配了一个DataTemplate。现在我想在MapControl中添加一个MapIcon，它是DataTemplate的子级，如下所示：

<DataTemplate x:Key="EWDetailsContentTemplate" x:DataType="viewModels:Task">
        <Grid x:Name="ContentPanel"
                  Background="White"
                  Margin="0,5,0,0">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <Maps:MapControl x:Name="LocationMapControl"  
                             MapServiceToken="key"
                             Grid.Row="0"
                             Height="250"/>
         //more controls
       </Grid>

如何使用C#的VisualTree概念获得MapControl？

Answer 1

如何使用C#的VisualTree概念获得MapControl？

您可以使用VisualTreeHelper使用以下代码获取MapControl：

//This function will get all the children Control of one Controls' Container
public List<Control> AllChildren(DependencyObject parent)
{
    var _List = new List<Control>();
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
    {
        var _Child = VisualTreeHelper.GetChild(parent, i);
        if (_Child is Control)
            _List.Add(_Child as Control);
        _List.AddRange(AllChildren(_Child));
    }
    return _List;
}
private MapControl GetMapControl()
{
    var controls = AllChildren(myContentPresenter);//"myContentPresenter" is your ContentPresenter's name.
    var mapControl = (MapControl)controls[0];
    return mapControl;
}