使用 Xamarin 绑定地图多边形形成地图

Question

我正在使用 Xamarin 表单地图，下面的 xaml 适用于硬编码的几个多边形和多边形内的位置。 现在我已经证明了这项工作我想制作地图：多边形条目是数据绑定到我在列表中的可观察多边形集合，然后在其中我想将位置作为多边形绑定对象内的集合（我知道如何在 ViewModel 中执行此操作）但我不知道如何设置 XAML 以配置与 ViewModel 的绑定 - 我该怎么做？

    <maps:Map MapType="{Binding CurrentMapType, Mode=TwoWay}" ItemsSource="{Binding MyPins}" HasZoomEnabled="True" x:Name="map" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">

            <x:Arguments>
            <maps:MapSpan>
                <x:Arguments>
                    <maps:Position>
                        <x:Arguments>
                      
                            <x:Double>-41.6</x:Double>
                            <x:Double>173.0</x:Double>
                        </x:Arguments>
                    </maps:Position>
                    <x:Double>13</x:Double>
                    <x:Double>13</x:Double>
                  </x:Arguments>
            </maps:MapSpan>
            </x:Arguments>
            <maps:Map.ItemTemplate>
                <DataTemplate>
                    <maps:Pin Position="{Binding Position}"
                                Address="{Binding Address}"
                                Label="{Binding Description}" />
                </DataTemplate>    
            </maps:Map.ItemTemplate>

地图：Map.MapElements

        <maps:Polygon StrokeColor="#1BA1E2"
                      StrokeWidth="8"
                      
                      FillColor="#881BA1E2" >
            <maps:Polygon.Geopath>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6368894</x:Double>
                        <x:Double>-122.134655</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6359424</x:Double>
                        <x:Double>-122.134655</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6359496</x:Double>
                        <x:Double>-122.1325521</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6424124</x:Double>
                        <x:Double>-122.1325199</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.642463</x:Double>
                        <x:Double>-122.1338932</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6406414</x:Double>
                        <x:Double>-122.1344833</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6384943</x:Double>
                        <x:Double>-122.1361248</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6372943</x:Double>
                        <x:Double>-122.1376912</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6368678</x:Double>
                        <x:Double>-122.137305</x:Double>
                    </x:Arguments>
                </maps:Position>
            </maps:Polygon.Geopath>
        </maps:Polygon>
        <maps:Polyline StrokeColor="Black"
                        StrokeWidth="12">
            <maps:Polyline.Geopath>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6381401</x:Double>
                        <x:Double>-122.1317367</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6381473</x:Double>
                        <x:Double>-122.1350841</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6382847</x:Double>
                        <x:Double>-122.1353094</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6384582</x:Double>
                        <x:Double>-122.1354703</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6401136</x:Double>
                        <x:Double>-122.1360819</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6403883</x:Double>
                        <x:Double>-122.1364681</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6407426</x:Double>
                        <x:Double>-122.1377019</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6412558</x:Double>
                        <x:Double>-122.1404056</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6414148</x:Double>
                        <x:Double>-122.1418647</x:Double>
                    </x:Arguments>
                </maps:Position>
                <maps:Position>
                    <x:Arguments>
                        <x:Double>47.6414654</x:Double>
                        <x:Double>-122.1432702</x:Double>
                    </x:Arguments>
                </maps:Position>
            </maps:Polyline.Geopath>
        </maps:Polyline>
    </maps:Map.MapElements>
        </maps:Map>

     </StackLayout>