WPF DataGrid is adding a new row even though edit was cancelled

Question

The Problem

I use a DataGrid with CanUserAddRows="true" , so the user can use the placeholder row at the bottom to add entries, but I get unwanted behaviour:

When the user cancels editing of the placeholder row using the ESC key and then selects another row, the DataGrid will refresh and an additional empty row appears.

Is there a way to prevent this empty row from being added?

---

The Code

MainWindow.xaml

<Window x:Class="DataGridTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid Name="dgCommands" Margin="5"/>
    </Grid>
</Window>

MainWindows.xaml.cs

using System.Collections.Generic;
using System.Windows;

namespace DataGridTest
{
    public partial class MainWindow : Window
    {
        private List<Command> commands = new List<Command>();

        public MainWindow()
        {
            InitializeComponent();

            commands.Add(new Command
            {
                Request = "Marco",
                Response = "Polo"
            });

            dgCommands.ItemsSource = commands;
        }
    }

    public class Command
    {
        public string Request
        {
            get;
            set;
        }

        public string Response
        {
            get;
            set;
        }
    }
}

Answer 1

You can check EditAction in CellEditEnding event:

add event to grid in yout xaml:

<DataGrid Name="dgCommands" Margin="5" CellEditEnding="dataGrid_CellEditEnding" />

and in your code behind:

private void dataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e) {
        //If pressed ESC key
        if (e.EditAction == DataGridEditAction.Cancel) {
            return;
        }
        else {
            //Save new row
        }
    }