WPF -从代码后台打开/关闭键盘

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

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void OpenKeyboardButton_Click(object sender, RoutedEventArgs e)
        {
            // 打开键盘
            TouchKeyboard.ShowTouchKeyboard();
        }

        private void CloseKeyboardButton_Click(object sender, RoutedEventArgs e)
        {
            // 关闭键盘
            TouchKeyboard.HideTouchKeyboard();
        }
    }

    public static class TouchKeyboard
    {
        public static void ShowTouchKeyboard()
        {
            // 打开键盘
            InputMethod.Current.ImeState = InputMethodState.On;
        }

        public static void HideTouchKeyboard()
        {
            // 关闭键盘
            InputMethod.Current.ImeState = InputMethodState.Off;
        }
    }
}