CODEWITHSUNDEEP
c#wpfxamllistviewcommand
Farmer
Farmer

Reputation: 10983

Use CommandParameter with a button outside the ListView

I have a ListView binded to an ObservableCollection<User>, and a button Delete.

I want to delete the selected item from the ListView when I hit the Delete button, but I coudn't find a way to pass the selected item to the Button's CommandParameter.

<Button Content="Delete" Command="{Binding DeleteCommand}" CommandParameter="{Binding ?}" />
<ListView ItemsSource="{Binding Path=UserList}">
    <ListView.View>
        <GridView>
            <GridViewColumn DisplayMemeberBinding="{Binding Name}" />
            <GridViewColumn DisplayMemeberBinding="{Binding Age}" />                    
        </GridView>
    </ListView.View>
</ListView>

How could you do that ?

Upvotes: 1

Views: 1805

Answers (1)

Fede
Fede

Reputation: 44028

You could use an ElementName Binding:

<Button Content="Delete" Command="{Binding DeleteCommand}" 
        CommandParameter="{Binding SelectedItem, ElementName=MyListView}" />
<ListView ItemsSource="{Binding Path=UserList}" x:Name="MyListView">

Edit:

If you don't want to use x:Name (for whatever reasons) you can create a SelectedItem property in your ViewModel and bind the ListView.SelectedItem property to that. That way you don't need a CommandParameter at all because you already have that information at the ViewModel level:

public class MyViewModel
{
    public MyData SelectedItem {get;set;} //NotifyPropertyChanged(), etc.

    public DelegateCommand DeleteCommand {get;set;}

    void OnDelete()
    {
        //Here you delete SelectedItem, no need for CommandParameter
    }
}

XAML:

<Button Content="Delete" Command="{Binding DeleteCommand}"/>
<ListView ItemsSource="{Binding Path=UserList}" 
          SelectedItem="{Binding SelectedItem}">

Side Comment: x:Name is perfectly fine.

Upvotes: 2

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