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Handling an ViewModel command on Item Select


By : mrrobot
Date : September 29 2020, 02:00 AM
I hope this helps . Your view model item should have a boolean property that indicates if it is selected or not. Any code that needs to be executed when the selection state of an item changes can be called in the property setter.
code :
public class ViewModelItem : INotifyPropertyChanged
{
    private bool selected;

    public bool Selected
    {
        get { return selected; }
        set
        {
            selected = value;
            // fire PropertyChanged event
            // add call optional additional code here
        }
    }
}
<ListView.ItemContainerStyle>
    <Style TargetType= "ListViewItem">
        <Setter Property="IsSelected" Value="{Binding Selected}"/>
    </Style>
</ListView.ItemContainerStyle>
public class ViewModel : INotifyPropertyChanged
{
    public ObservableCollection<ViewModelItem> Items { get; }
        = new ObservableCollection<ViewModelItem>();

    private ViewModelItem selectedItem;

    public ViewModelItem SelectedItem
    {
        get { return selectedItem; }
        set
        {
            selectedItem = value;
            // fire PropertyChanged event
            // add call optional additional code here
        }
    }
}
<ListView ItemsSource="{Binding Items}"
          SelectedItem="{Binding SelectedItem}" />


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binding a command inside a listbox item to a property on the viewmodel parent


By : Daniel
Date : March 29 2020, 07:55 AM
I wish this help you There's two issue working against you here.
The DataContext for the DataTemplate is set to the item the template is displaying. This means you can't just use binding without setting a source.
code :
<ListBox ItemsSource="{Binding Path=AllNewsItems}">
    <ListBox.Resources>
        <l:DataContextSpy x:Key="dataContextSpy" />
    </ListBox.Resources>

    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel>
                <TextBlock>
                   <Hyperlink Command="{Binding Source={StaticResource dataContextSpy}, Path=DataContext.OpenNews}" CommandParameter="{Binding}">
                       <TextBlock Text="{Binding Path=NewsContent}" />
                   </Hyperlink>
               </TextBlock>
           </StackPanel>
       </DataTemplate>
   </ListBox.ItemTemplate>
</ListBox>

How to bind an item command in user conrol to viewmodel command?


By : feri_mory
Date : March 29 2020, 07:55 AM
it helps some times I found it...I can define a DependensyProperty typof RelayCommand in my usercontrol and bind my DependensyProperty to my ViewModel Command

ComboBox does not select any Item provided from ViewModel


By : Jiří Meduna
Date : March 29 2020, 07:55 AM
this one helps. You are running into a very common problem, two identical Gender objects are not equal to each other!
ComboBox sees the bound selected item, but doesn't see a matching item (actually, it doesn't see a matching reference) so it doesn't select anything.

How can I programatically select a listview item from within the viewmodel?


By : Jon Coppock
Date : March 29 2020, 07:55 AM
I hope this helps . Its very easy to implement
You need two things in your view model A List of your objects and a selected item property

Pass selected item as command parameter vs. using a bound ViewModel Object (MVVM)


By : Prasad
Date : March 29 2020, 07:55 AM
this one helps. The only real difference is readability (and potentially one extra binding for the engine to have to evaluate, but that isn't going to really hurt you in this case).
You are using SelectedTemplate either way so I wouldn't bother with binding it to the parameter and use it directly.
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