c# - DataTemplate の UWP 画像が AdaptiveGurdView にバインドされない

Question

アダプティブグリッドを実装し、独自の画像で埋めるためにさまざまな方法を試していますが、何をしても空白の画面が表示されます。

次のことを試しましたが、エラーは発生しませんが、ローカルで実行してもコマンド バー以外は何も表示されません。

Mainpage.xaml:

<Page
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:MobileAppProject"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:viewModels="using:ViewModels"
    xmlns:Controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
    x:Class="MobileAppProject.MainPage"
    mc:Ignorable="d">


    <Page.Resources>
        <DataTemplate x:Key="AdaptTemplate" x:DataType="local:AdaptItem">
            <Grid
                Background="White"
                BorderBrush="Black"
                BorderThickness="1">
                <Image
                    Source="{Binding Image}"
                    Stretch="UniformToFill"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"/>
            </Grid>
        </DataTemplate>
    </Page.Resources>

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <ScrollViewer VerticalScrollMode="Auto" VerticalScrollBarVisibility="Auto">
            <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Margin="12,10,12,12">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>



                <StackPanel Margin="0,0,0,10"/>

                <Grid Grid.Row="1">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition/>
                    </Grid.RowDefinitions>
                    <Controls:AdaptiveGridView Name="AdaptiveGridViewControl"
                                   OneRowModeEnabled="False"
                                   ItemHeight="200"
                                   DesiredWidth="300"
                                   SelectionMode="Single"
                                   IsItemClickEnabled="True"
                                   ItemTemplate="{StaticResource AdaptTemplate}"/>
                    <StackPanel VerticalAlignment="Bottom" Margin="0,24,0,0" Grid.Row="1" Background="{ThemeResource SystemControlBackgroundAccentBrush}">

                        <CommandBar x:Name="cmdbar" 
                                    IsOpen="{Binding IsChecked, ElementName=isopentoggle, Mode=TwoWay}"
                                    IsSticky="{Binding IsChecked, ElementName=isstickytoggle, Mode=TwoWay}"
                                    ClosedDisplayMode="{Binding SelectedItem.Content, ElementName=combobox}">
                            <CommandBar.SecondaryCommands>
                                <AppBarButton Label="Menu Item 1"/>
                                <AppBarButton Label="Menu Item 2"/>
                                <AppBarButton Label="Menu Item 3"/>
                                <AppBarButton Label="Menu Item 4"/>
                            </CommandBar.SecondaryCommands>
                            <AppBarButton Icon="Accept" Label="Accept"/>
                            <AppBarToggleButton Icon="Contact" Label="Contact"/>
                        </CommandBar>
                        <Image HorizontalAlignment="Left" Source="Assets/storeLogo-sdk.png" Stretch="None"/>
                    </StackPanel>
                </Grid>

                <!-- Status Block for providing messages to the user.  Use the
             NotifyUser() method to populate the message -->
                <TextBlock x:Name="StatusBlock" Grid.Row="2" Margin="12, 10, 12, 10" Visibility="Collapsed"/>
            </Grid>
        </ScrollViewer>

    </Grid>
</Page>

Mainpage.xaml.cs:

private ObservableCollection<AdaptItem> picItems_;

        private ObservableCollection<AdaptItem> PicItems
        {
            get
            {
                return picItems_;
            }
            set
            {
                picItems_ = value;
            }

        }
        public MainPage()
        {
            this.InitializeComponent();
            picItems_ = AdaptItem.AdaptList();
            this.DataContext = PicItems;
        }

AdaptGrid を埋めるための AdaptTemplate.cs:

 public class AdaptItem
    {
        public String Image
        {
            get;
            set;
        }
    }

    public static ObservableCollection<AdaptItem> AdaptList()
    {
        ObservableCollection<AdaptItem> pics = new ObservableCollection<AdaptItem>()
        {
            new AdaptItem
            {
                Image = "Assets/01.jpg"
            },
            new AdaptItem
            {
                Image = "Assets/02.jpg"
            },
            new AdaptItem
            {
                Image = "Assets/03.jpg"
            },
            new AdaptItem
            {
                Image = "Assets/04.jpg"
            },
            new AdaptItem
            {
                Image = "Assets/05.jpg"
            }
        };

        return pics;
    }