mvvm ItemDoubleClick command

[Florin]

I have  this user control view.

 

<UserControl x:Class="TelerikWpfApp1.Views.MainMenuUserControlPanelBarStyle"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:TelerikWpfApp1.Views"
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 
             mc:Ignorable="d" 
             d:DesignHeight="500" d:DesignWidth="250">
    <UserControl.DataContext>
        <Binding Mode="OneWay" Path="MainMenuUserContentPanelBarStyle" Source="{StaticResource Locator}"/>
    </UserControl.DataContext>
    <UserControl.Resources>
        <HierarchicalDataTemplate x:Key="Entity" ItemsSource="{Binding Randuri}">
            <StackPanel Orientation="Horizontal">
                <Label x:Name="btn" Content="{Binding Titlu}" 
                           Margin="0,0,0,0"
                           />
            </StackPanel>
        </HierarchicalDataTemplate>
    </UserControl.Resources>

    
    <Grid>
                             <!--ItemDoubleClick  ="{Binding PanelBarItemDoubleClick}"-->

        <telerik:RadPanelBar x:Name="radPanelBar"
                             Margin="0,0" 
                             ExpandMode="Multiple" 
                             ItemsSource="{Binding UserMeniu}"
                             ItemTemplate="{StaticResource Entity}"  
                             SelectedItem="{Binding PanelBarSelectedItem, Mode=TwoWay}"
                             
                             >
        </telerik:RadPanelBar>

    </Grid>
    
</UserControl>

 

And the code for ItemDoubleClick ...:

        private void PanelBarItemDoubleClick(object sender,  Telerik.Windows.RadRoutedEventArgs e) {
            MessageBox.Show("It's working...");
        }

When I run the project I get the error message "Unable to cast object of type 'System.Reflection.RuntimeEventInfo' to type 'System.Reflection.MethodInfo'."

What can I do ?

Thanks.

 

[Tanya]

Hello Florin,

The WPF framework doesn't allow you binding to event handlers using the exposed property. More information on the approaches for attaching handlers to the events is available in this article.

To attach an event handler from the view model, you can try using the EventToCommandBehavior.

Hope this helps.

Regards,
Tanya
Telerik by Progress

[Florin]

Great.

Thank you.

I tried, following the example suggested, to use properties of clicked item:

        private void OnCustomCommandExecuted(object obj)  {

            var clickedItem = (obj as RadRoutedEventArgs).OriginalSource as ???; 
            if (clickedItem != null)
            {
                MessageBox.Show("Clicked Item: " + clickedItem."SomeProperties");
            }
 

... but the clickedItem is null every time.

 

 

[Tanya]

Hi Florin,

To pass any parameter in the handler of the command, you should set the command parameter properties. More information about these settings is available in the Command Parameters section.

Regards,
Tanya
Telerik by Progress

[Mohammad]

Hi
When I use this code:
            RadTreeViewItem clickedItem = (obj as RadRoutedEventArgs).OriginalSource as RadTreeViewItem;
clickedItem is null
And when I use this:

            RadTreeView clickedItem = (obj as RadRoutedEventArgs).Source as RadTreeView;
it is not null but I need to access to RadTreeViewItem for LoadOnDeman.
my XAML:
       <telerik:RadTreeView x:Name="radTreeView" Grid.Row="1" Grid.ColumnSpan="3"
                IsTextSearchEnabled="True" telerik:TextSearch.TextPath="Name" Padding="10"
                            IsLoadOnDemandEnabled="True"
                Margin="0 0 1 0" ItemsSource="{Binding Models}">
            <telerik:RadTreeView.ItemTemplate>
                 <HierarchicalDataTemplate ItemsSource="{Binding Items}">
                       <StackPanel Orientation="Horizontal" Margin="2" >
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="Auto"></ColumnDefinition>
                                <ColumnDefinition Width="500"></ColumnDefinition>
                            </Grid.ColumnDefinitions>

                            <TextBlock Text="{Binding Name}" Grid.Column="0" VerticalAlignment="Center" HorizontalAlignment="Right" />
                            <TextBlock Text="{Binding TitleTypeName}" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="50 0 0 0"/>
                        </Grid>
                    </StackPanel>
                </HierarchicalDataTemplate>
            </telerik:RadTreeView.ItemTemplate>
                  <telerik:EventToCommandBehavior.EventBindings>
                    <telerik:EventBinding RaiseOnHandledEvents="True" PassEventArgsToCommand="True" EventName="LoadOnDemand" Command="{Binding OnCustomCommand}" />
                </telerik:EventToCommandBehavior.EventBindings>

and I use MVVM .
Thank you for your helping.
Mahoodi

[Vladimir Stoyanov]

Hello Mohammad,

Thank you for the provided code. 

I tested the described scenario on my end, however I was not able to reproduce the same result. That is why I am attaching the sample project, which I used for testing purposes. May I ask you to check it out and let me know, if I am missing something? Can you share what modifications are needed so that I can reproduce the same result in the attached project? This way I will check out the behavior on my end and investigate it.

Regards,
Vladimir Stoyanov
Progress Telerik