Event trigger is not working inside ItemControl

Event trigger is not working inside ItemControl

I have a Item control which fills by a list, and list is collection of two parameters 'Time' and 'Description'. For it, i am using a HyperLinkButton for time and a Label for description.

What i want is that, i want to create click event using EventTrigger of hyperLink button in Main viewModel. My code is:

<ItemsControl      x:Name="transcriptionTextControl"      ItemsSource="{Binding MyCollectionOfTranscription, Mode=TwoWay}">     <ItemsControl.ItemTemplate>         <DataTemplate>             <StackPanel>                 <HyperlinkButton Content="{Binding Time}">                     <ToolTipService.ToolTip>                         <ToolTip Content="Time"/>                     </ToolTipService.ToolTip>                     <i:Interaction.Triggers>                         <i:EventTrigger EventName="Click">                             <i:InvokeCommandAction                                  Command="{Binding HyperLinkButtonCommand}"                                  CommandParameter="{Binding                                      ElementName=transcriptionTextControl }" />                         </i:EventTrigger>                     </i:Interaction.Triggers>                 </HyperlinkButton>                 <sdk:Label Content="{Binding Description}"/>             </StackPanel>         </DataTemplate>     </ItemsControl.ItemTemplate> </ItemsControl> 

When i build project, it doesn't give error but ICommand for hyperLink, shows warning as 'Cannot resolve symbol HyperLinkButtonCommand', while this event trigger is working fine outside this .

Not getting, what is actual problem behind it, plz give your valuable suggestion...

Answers & Comments...

Answer: 1

First off,

<i:InvokeCommandAction      Command="{Binding HyperLinkButtonCommand}"      CommandParameter="{Binding          ElementName=transcriptionTextControl }" /> 

The Binding is trying to locate a property called HyperLinkButtonCommand on the instance of the type that is contained within MyCollectionOfTranscription (you don't need to bind to this two-way).

(Side note, sending an ItemsControl into your Command is not MVVM.)

The ItemsControl iterates through each element in this collection, creates a copy of the template defined in ItemsControl.ItemTemplate, and sets the BindingContext equal to this element (I assume its a Transcript). You can tell this from the warnings you get from the binding failing to find your HyperLinkButtonCommand if you crank up databinding debug settings.

Assuming

1. HyperLinkButtonCommand is a command defined in your ViewModel, and
2. The root of this xaml is a Window (could be a UserControl, but am assuming here)
3. Your ViewModel is the DataContext of the Window

you can change the binding to the following and it should work (or you should get a clue from it)

<i:InvokeCommandAction      Command="{Binding HyperLinkButtonCommand,                RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"      CommandParameter="{Binding          ElementName=transcriptionTextControl }" /> 

I prefer just to give my root an x:Name of "root" and use "ElementName=root" in cases like this.

by : Willhttp://stackoverflow.com/users/1228

---