DelegateCommand on WPF

MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Button x:Name="button">
        TEST
    </Button>
</Window>

MainWindow.xaml.cs

using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApp1
{
    public sealed class DelegateCommand : ICommand
    {
        private readonly Func<bool> canExecute;
        private readonly Action execute;

        public DelegateCommand(Func<bool> canExecute, Action execute)
        {
            this.canExecute = canExecute;
            this.execute = execute;
        }

        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter) =>
            canExecute();

        public void Execute(object parameter) =>
            execute();
    }

    public sealed class DelegateCommand<T> : ICommand
    {
        private readonly Func<T, bool> canExecute;
        private readonly Action<T> execute;

        public DelegateCommand(Func<T, bool> canExecute, Action<T> execute)
        {
            this.canExecute = canExecute;
            this.execute = execute;
        }

        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter) =>
            parameter is T value ? canExecute(value) : false;

        public void Execute(object parameter) =>
            execute((T)parameter);
    }

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            button.Command = new DelegateCommand(
                () => true,
                () => button.Content = "Clicked!");
        }
    }
}