使用复选框和“删除”按钮从WPF Datagrid删除多行

Question

I have a DataGrid that contains a checkbox. I would like to delete all the rows from the DataGrid where the checkbox is checked by clicking on a delete button. The XAML for my datagrid is shown below.

    <DataGrid x:Name="orders" Grid.Row="4" Background="AliceBlue" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" AutoGenerateColumns="False"  >
        <DataGrid.Columns>
            <DataGridCheckBoxColumn  Header="Select" Binding="{Binding Path=IsSelected, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGridRow}}}" ></DataGridCheckBoxColumn>
            <DataGridTextColumn Header="Item Name" Binding="{Binding Path=Name}" ></DataGridTextColumn>
        </DataGrid.Columns>
    </DataGrid>

I would like to write code for click button to delete all the rows where the checkbox is checked like so.

    private void btnDelete_Click(object sender, RoutedEventArgs e)
    {
        //Delete logic here

    }

How do I achieve this? NB: I'm using EntityFramework and not ADO. the datagrid is bound to an observable collection of type Order like ObservableCollection<Order>

Answer 1

First make sure the DataGrid allows multi-selection via the SelectionMode

SelectionMode="Extended"

Then on button click get the selected items from the grid based on the IsSelected binding in the view

private void btnDelete_Click(object sender, RoutedEventArgs e) {
    //get selected items
    if (orders.SelectedItems != null && orders.SelectedItems.Count > 0) {
        var toRemove = orders.SelectedItems.Cast<Order>().ToList();
        //Delete logic here
        //...remove items from EF and save

        //Once confirmed remove from items source
        var items = orders.ItemsSource as ObservableCollection<Order>;
        if (items != null) {
            foreach (var order in toRemove) {
                items.Remove(order);       
            } 
        }
    }
}

Answer 2

Write code behind like this....
        public MainWindow()
        {
            InitializeComponent();
            List<Great> p = new List<Great>();
            p.Add(new Great() { Name = "Good" });
            p.Add(new Great() { Name = "Bad" });
            p.Add(new Great() { Name = "Ugly" });
            orders.ItemsSource = p;

        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            List<Great> SelectedOrders = new List<Great>();
            for (int i = 0; i < orders.SelectedItems.Count; i++)
            {
                SelectedOrders.Add((Great)orders.SelectedItems[i]);
            }
            var kk = orders.ItemsSource as List<Great>;
            foreach (var item in SelectedOrders)
            {
                kk.Remove(item);
            }
            orders.Items.Refresh();
        }

       public class Great
        {
            public string Name { get; set; }
        }

Answer 3

Just call the Clear() method on the ObservableCollection<Order> :

private void btnDelete_Click(object sender, RoutedEventArgs e)
{
    var sourceCollection = orders.ItemsSource as ObservableCollection<Order>;
    if (orders != null)
        orders.Clear();
}