EventArgs as CommandParameter on InvokeCommandAction

[RaminMT]

Hi, Is it possible to use event arguments as parameter for commands when using InvokeCommandAction?! Actually I'm using ItemClick event with behaviors on a ListView & ItemClickEventArgs is the only way to know which item clicked. Maybe It's good to notice for a reason I can't use SelectedItem, because It's null when you set SelectionMode="None" & also that I'm developing UWP app in C#.

Thanks

[pedrolamas]

By default, that's exactly what will be passed to the command!

Just make sure you don't set theCommandParameter or Converter properties and also that your command execution method can actually receive the parameter!

[RaminMT]

Oops! Thank you! I didn't know that!

[pedrolamas]

No problem! Please do close this issue if this solves the problem! 😄

[HppZ]

what if I need sender and args?

[pedrolamas]

@HppZ the sender is currently being ignored; if you need it, my advice is to copy the source code for the InvokeCommandAction to your project and change the Execute method to match your needs!

[HppZ]

OK, got you, thanks.

[HppZ]

maybe you can add this feature.

[manupstairs]

Hi @PedroLamas , my question is: Is it possible to binding one property of xxxEventArgs with CommandParameter? For example, I want pass Uriof NavigationEventArgs. Because NavigationEventArgs belongs to View layer, we'd better not pass it to ViewModel.

<WebView local:WebViewEx.Uri="{Binding LoginUri, Mode=OneTime}">
        <Interactivity:Interaction.Behaviors>
            <Core:EventTriggerBehavior EventName="LoadCompleted">
                <Core:InvokeCommandAction Command="{Binding LoginCommand}" CommandParameter="{Binding Uri}"/>
            </Core:EventTriggerBehavior>
        </Interactivity:Interaction.Behaviors>
</WebView>

[HppZ]

@manupstairs Binding to Source property of WebView using ElementName

[manupstairs]

Thanks @HppZ for you quickly reply. In fact I tried, it can works if I write <Core:InvokeCommandAction Command="{Binding LoginCommand}" CommandParameter="{Binding ElementName=webView}"/> I can find xxxWebView.Source is changed after LoadCompleted event. But if I just write <Core:InvokeCommandAction Command="{Binding LoginCommand}" CommandParameter="{Binding Source,ElementName=webView}"/> The source of WebView will keep the origin value in ViewModel. Sorry I forget to say I want to use WebView for a OAuth login. I wan to get response uri after user login.

[pedrolamas]

@manupstairs you can just create and pass a custom converter that will take the event args and return the uri from it!

Should look something like this:

<WebView local:WebViewEx.Uri="{Binding LoginUri, Mode=OneTime}">
        <Interactivity:Interaction.Behaviors>
            <Core:EventTriggerBehavior EventName="LoadCompleted">
                <Core:InvokeCommandAction Command="{Binding LoginCommand}" InputConverter="{StaticResource MyCustomConverter}"/>
            </Core:EventTriggerBehavior>
        </Interactivity:Interaction.Behaviors>
</WebView>

[manupstairs]

Very Cool! Thanks Pedrolamas!

[bromoapp]

Hi, sorry to reopen this issue. @PedroLamas or @manupstairs do you have any sample code for Custom Converter? I'm building an UWP app and using WebView too

Thanks

[pedrolamas]

@bromoapp all you need is a class that implements IValueConverter:

public class MyCustomConverter : Windows.UI.Xaml.Data.IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        //implement your conversion operation here

        return null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        //you can leave this one like this as it's not required for this case

        throw new NotImplementedException();
    }
}

[weitzhandler]

I want to bind CommandParameter to the a property of the control that triggered the action, for example:

<NavigationView IsSettingsVisible="True">
  <i:Interaction.Behaviors>
    <core:EventTriggerBehavior EventName="ItemInvoked">
      <core:EventTriggerBehavior.Actions>
        <core:InvokeCommandAction Command="{Binding MenuNavigated}"
           CommandParameter="{Binding <InvokeItem>.Tag}" />
      </core:EventTriggerBehavior.Actions>
    </core:EventTriggerBehavior>
  </i:Interaction.Behaviors>
  <NavigationView.MenuItems>
    <NavigationViewItem Icon="Contact" Content="Contacts" Tag="contacts"/>
  </NavigationView.MenuItems>
</NavigationView>

How can I achieve that?

[pedrolamas]

@weitzhandler please don't reply to closed issues with new/different context of the issue itself. As what you wrote is more of a question than an issue, I also recomment that you use StackOverflow, tagging the question with the UWP tag.

Having said that, what you want should be possible by just adding a name to the control (like x:Name="ControlName") and then using {Binding TheControlProperty, ElementName=ControlName}

[weitzhandler]

@PedroLamas tx for your reply There is no element name, it's auto generated from data-template. I want to refer to the currently selected NavigationViewItem.

Anyway, I switched from using a command to a SelectedItem in my VM and finished.