我试图创建一个布局，其中有重复的自定义条目列表，并且当任何文本列表发生变化时，SuggestedText出现，这只是一个字符串观察集合，在构建视图模式期间初始化。

<StackLayout BindableLayout.ItemsSource="{Binding MyObjectLists.ListofLicensePlates}"  VerticalOptions="FillAndExpand">
        <BindableLayout.ItemTemplate>
               <DataTemplate>
                      <Frame Margin="0,10,0,10" Padding="0" HasShadow="False" BackgroundColor="Transparent">
                         <Grid Margin="20">
                            <Grid.ColumnDefinitions>
                                   <ColumnDefinition Width="*" ></ColumnDefinition>
                                   <ColumnDefinition Width="*"></ColumnDefinition>
                            </Grid.ColumnDefinitions>
                            <StackLayout Orientation="Vertical" Grid.Column="0" Grid.Row="0" >
                                   <Label Text="Text1" TextColor="Black" FontAttributes="Bold" Grid.Column="0" Grid.Row="0" />
                                              <AbsoluteLayout>
                                                   <Frame Grid.Column="0" Grid.Row="1"  Padding="5" HasShadow="False" BorderColor="{StaticResource GrayBorderColor}" CornerRadius="30" HeightRequest="55" HorizontalOptions="FillAndExpand">
                                                      <controls:BorderlessEntry 
                                                             TextTransform="Uppercase" Text="{Binding LicensePlate}"
                                                             Index = "{Binding Index}"
                                                             TextChanged ="ShowListView" Completed="ShowListView"
                                                             MaxLength="50" x:Name="Text1" Keyboard="Text" 
                                                             Placeholder="Text1"
                                                                                     AbsoluteLayout.LayoutBounds="15,70,285,38" AbsoluteLayout.LayoutFlags="None"
                                                                                     FontFamily="OpenSansRegular" />
                                                  </Frame>
                                                  <ListView BindableLayout.ItemsSource="{Binding Path=BindingContext.SuggestedText, Source={x:Reference thispage}}" 
                                                                                  x:Name="LicensePlateListView" IsVisible="{Binding IsVisible}" CachingStrategy="RecycleElement" 
                                                                                  BackgroundColor="White" ItemTapped="OnItemTapped" AbsoluteLayout.LayoutBounds="20,110,269,160" 
                                                                                  AbsoluteLayout.LayoutFlags="None">
                                                       <BindableLayout.ItemTemplate>
                                                            <DataTemplate>
                                                                  <StackLayout BackgroundColor="White">
                                                                        <Label Text="{Binding .}" FontSize="16" TextColor="#FF464859"/>
                                                                  </StackLayout>
                                                            </DataTemplate>
                                                        </BindableLayout.ItemTemplate>
                                                   </ListView>
                                            </AbsoluteLayout>
                           </Grid>
                      </Frame>
               </DataTemplate>
          </BindableLayout.ItemTemplate>
</StackLayout>

以下是创建建议文本的方式：

public class MyViewModel : BaseViewModel
{
        public LicensePlateListViewModel()
        {
            
        }

        public MyViewModel (MyObject parameters, INavigation navigation)
        {
            MyObjectLists = parameters;
            
            Device.BeginInvokeOnMainThread(() => {
                try
                {
                    FillSuggestText();
                }
                catch (Exception ex)
                {
                    IsBusy = false;
                    Helper.GlobalErrorTrashing(ex);
                }
            });

        }
        private MyObject myObjectLists;
        public MyObject MyObjectLists
        {
            get { return myObjectLists; }
            set { myObjectLists= value; OnPropertyChanged(); }
        }
        private ObservableCollection<string> suggestedText;
        public ObservableCollection<string> SuggestedText
        {
            get { return suggestedText; }
            set { suggestedText= value; OnPropertyChanged(); }
        }

        public void FillSuggestText()
        {
            if (PaidGuestParking.GuestZoneParking.Parkings != null)
            {
                var texts = MyObjectLists.TextList.Select(p => p.Text).ToList();
                foreach(var text in texts ) { 
                    SuggestedText.Add(text);
                }
            }
        }

...
...
...
}

MyObject是这样的：

public class MyObject
{
   public List<TextObject> TextList { get; set; }
   public ObservableCollection<string> ListofLicensePlates { get; set; }
}

show list view是一个简单的函数，它可以为条目下的特定列表视图更改IsVisible。如果我静态列出所有列表视图源代码，它可以正常工作，但每当我尝试动态添加来自SugestedText的内容时，我在导航到此页面之前会收到错误。

ex = {System.InvalidCastException: Specified cast is not valid.
  at Xamarin.Forms.BindableLayout+<>c.<.cctor>b__19_4 (Xamarin.Forms.BindableObject b) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\BindableLayout.cs:24 
  at Xamarin.Forms.BindableObject.CreateAndAddCo...

我真的被困在这个地方，请给我一些建议，我也愿意改变，使建议文本是在我的对象列表本身，使建议文本可能是不同的输入，但这样做也提示相同的错误。