GetAsyncKeyState和使用System.Windows.Forms不起作用

Question

我的“键盘记录器”有问题。为什么在这段代码中我看到库“使用System.Windows.Forms;”

的问题

它显示以下错误：

  

名称空间'System.Windows'中不存在类型或命名空间名称'Forms'（您是否缺少程序集引用？）
  C：\ Users \ SoChi \ documents \ visual studio 2013 \ Projects \ WpfApplication8 \ WpfApplication8 \ MainWindow.xaml.cs 16 22 WpfApplication8

我不知道为什么。你能救我吗？

整个守则：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Runtime.InteropServices;
using System.ComponentModel;
namespace WpfApplication8
{
    public partial class MainWindow : Window
    {
               public MainWindow()
        {
            InitializeComponent();
        }
        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        public static extern Int16 GetAsyncKeyState(int vKey);
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            while (true)
            for (int key = 0; key < 255;key++)
                if (GetAsyncKeyState(key) == -32767)
                {
                    label.Content = "kliknales cos na klawiaturze";
                }
        }       
    }
}    `