Can't use ObservableCollection in a Grid? - xaml

Question

I am currently working with a Xamarin app for reading RFID temperature tags and updating their values in real time. The current setup uses two Horizontal StackLayouts, one with a ListView showing a list of tags and their values, and the other with a Grid of Images of the human body that I wish to display the values on as well (in specific places).
In the ListView side, I can successfully call an object called TagInfoList, which is an ObservableCollection in the Class I call from the BasePage initialization. However, on the Grid side, I've tried multiple methods of using the TagInfoList, but it does not work. I've tried BindableLayouts, DataTemplates + ViewCells, and none allow me to get TagInfoList usable within my second StackLayout.
Here is the XAML code for the two horizontal StackLayouts:
<StackLayout Orientation="Horizontal" HorizontalOptions="StartAndExpand">
<ListView x:Name="liewViewTagData" ItemsSource="{Binding TagInfoList}" SelectedItem="{Binding objItemSelected, Mode=TwoWay}">
<ListView.Header>
<StackLayout BackgroundColor="#cccccc">
<Grid>
<!-- Grid + Label code irrelevant to my issue-->
</Grid>
</StackLayout>
</ListView.Header>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Vertical">
<Grid>
<!-- Grid + Label code irrelevant to my issue-->
</Grid>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout> <!-- RFID Tag Section -->
<StackLayout Orientation="Horizontal" HorizontalOptions="EndAndExpand"> <!-- Body Model Section -->
<!-- HERE: WHAT TO PUT FOR TagInfoList TO BE USABLE? -->
<Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" WidthRequest="400" ColumnSpacing="0">
<!-- Grid + Label + Images I want to use TagInfoList information in -->
</Grid>
<!-- HERE: WHAT TO PUT FOR TagInfoList TO BE USABLE? -->
</StackLayout> <!-- Body Model Section -->
</StackLayout>```
I've deleted the bulk of inside Grids since it's not relevant. TagInfoList is an ObservableCollection of a class which contains all the data I need (strings and ints). How do I utilize TagInfoList within the second StackLayout? If I do it the same method as the first StackLayout, I get an error that I've called TagInfoList twice (through the 'liewViewTagData' item). Here is that code in the .xaml.cs file:
liewViewTagData.ItemSelected += (sender, e) => {
if (e.SelectedItem == null) return; // Don't do anything if we just de-selected the row
((ListView)sender).SelectedItem = null; // De-select the row
};
My sole goal is to use the TagInfoList ObservableCollection within both StackLayouts, but I'm not sure how to do that.
Thanks!

Answer 1

If I do it the same method as the first StackLayout, I get an error
that I've called TagInfoList twice (through the 'liewViewTagData'
item).
You can do it in the same way as the first StackLayout.And you can change property x:Name of the two listviews to different Name.
You can refer to the following code:
<ScrollView Orientation="Horizontal">
<StackLayout Orientation="Horizontal" HorizontalOptions="StartAndExpand">
<StackLayout Orientation="Horizontal" HorizontalOptions="EndAndExpand">
<ListView x:Name="liewViewTagData" RowHeight="60" ItemsSource="{ Binding TagInfoList}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<!--other code-->
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
<StackLayout Orientation="Horizontal" HorizontalOptions="EndAndExpand">
<ListView x:Name="liewView2" RowHeight="60" ItemsSource="{ Binding TagInfoList}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<!--other code-->
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</StackLayout>
</ScrollView>
Note:
If you run out of horizontal space, I suggest you add a ScrollView to the outer layer.