How to set different x:DataType on TapGestureRecognizers with Command from PageViewModel and CommandParameter from childviewmodel?

[borrmann]

I get lots of compiler warnings for not setting x:DataType on my TapGestureRecognizers.
The problem is, I have two differen BindingContexts for Command and CommandParameter, e.g.:

 <DataTemplate x:Key="QuestionsTemplate"
                           x:DataType="apimodelextensions:AutomationDtoExtension">
     <Border>
         <Border.GestureRecognizers>
             <TapGestureRecognizer Command="{Binding BindingContext.AutomationSelectedCommand, Source={x:Reference Page}}"
                                                    CommandParameter="{Binding .}" />
         </Border.GestureRecognizers>
     </Border>
</DataTemplate>

The Command is coming from the page's ViewModel, whereas the CommandParameter from the data that is passed to the DataTemplate . Therefore, I can't just set x:DataType on TapGestureRecognizer, because the parameters have different contexts. Does anyone know how to solve this?

[MitchBomcanhao]

what is stopping you from defining the datatype directly inside the Command or CommandParameter declarations?

[borrmann]

@MitchBomcanhao the missing knowledge how to do that! would you be so kind to show me an example?

[rokmeglic71]

@borrmann the CoPilot example does compile on my end. Does it work for you?

<DataTemplate
  x:Key="QuestionsTemplate"
  x:DataType="apimodelextensions:AutomationDtoExtension">
  <Border>
    <Border.GestureRecognizers>
      <TapGestureRecognizer>

        <!-- Command comes from the PAGE viewmodel -->
        <TapGestureRecognizer.Command>
          <Binding
            Source="{x:Reference Page}"
            Path="BindingContext.AutomationSelectedCommand"
            x:DataType="vm:MyPageViewModel" />
        </TapGestureRecognizer.Command>

        <!-- CommandParameter comes from the ITEM (AutomationDtoExtension) -->
        <TapGestureRecognizer.CommandParameter>
          <Binding
            Path="."
            x:DataType="apimodelextensions:AutomationDtoExtension" />
        </TapGestureRecognizer.CommandParameter>

      </TapGestureRecognizer>
    </Border.GestureRecognizers>
  </Border>
</DataTemplate>

[MitchBomcanhao]

@MitchBomcanhao the missing knowledge how to do that! would you be so kind to show me an example?

I'd just do something like

<TapGestureRecognizer Command="{Binding BindingContext.AutomationSelectedCommand, Source={x:Reference Page}}, x:DataType=morestuff:heretoo"
      CommandParameter="{Binding ., x:DataType=stuff:here}" />

that's how it is working on my app

[borrmann]

@MitchBomcanhao @rokmeglic71 awesome! Thank you both! unfortunately can't mark both as answer.

[rokmeglic71]

No worries @borrmann, @MitchBomcanhao answer is better 👍