WPF DataGrid Left Click only on Row

Question

How can i do a leftclick on a datagrid only enable when a row is selected? here are a example:

<DataGrid>
    <DataGrid.InputBindings>
            <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding LeftClickCommand}"/>
    </DataGrid.InputBindings>
</DataGrid>

Now when i click on no row in the datagrid the command is also executed, but i only wants to execute it when i click on a row.

Answer 1

you can test if the selected item is null this is just a way that maybe help you XAML:

        <Custom1:DataGrid IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding Persons}" SelectedItem="{Binding SelectedPerson}"  >
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseDoubleClick">
                <Custom:EventToCommand CommandParameter="{Binding SelectedItem, ElementName=dg}" Command="{Binding AfficheCommand, Mode=OneWay}"/>
            </i:EventTrigger>
        </i:Interaction.Triggers>

Code behind :

    private PersonModel _selectedPersons = new PersonModel();
    public PersonModel SelectedPerson
    {
        set
        {
            _selectedPersons = value;
        }
    }
    public ICommand AfficheCommand
    {
        get
        {
            return new DelegateCommand(AfficheText);
        }
    }

    private void AfficheText()
    {
        if(_selectedPersons != null)
           MessageBox.Show(_selectedPersons.FirstName);

       _selectedPersons  = null;
    }

I know that is not the best way but a way until you found a better idea ;)