Как эмулировать нажатие на кнопку в приложении WPF C#

Способ 1:

this.button.RaiseEvent(new RoutedEventArgs(Button.ClickEvent));

Способ 2:

typeof(System.Windows.Controls.Primitives.ButtonBase)
.GetMethod("OnClick", BindingFlags.Instance | BindingFlags.NonPublic)
.Invoke(button, new object[0]);

Пример:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }
    private void button_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("КНОПКА НАЖАТА");
    }
    private void button1_Click(object sender, RoutedEventArgs e)
    {
        this.button.RaiseEvent(new RoutedEventArgs(Button.ClickEvent));
    }
    private void button2_Click(object sender, RoutedEventArgs e)
    {
        typeof(System.Windows.Controls.Primitives.ButtonBase).GetMethod("OnClick", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(button, new object[0]);
    }
}