C#控制键盘按键的常用方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace sn设置键盘大小写
{
  public partial class Form1 : Form
  {
    const uint KEYEVENTF_EXTENDEDKEY = 0x1;
    const uint KEYEVENTF_KEYUP = 0x2;
    [DllImport("user32.dll")]
    static extern short GetKeyState(int nVirtKey);
    [DllImport("user32.dll")]
    static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);
    public enum VirtualKeys : byte
    {
      VK_NUMLOCK = 0x90, //数字锁定键
      VK_SCROLL = 0x91, //滚动锁定
      VK_CAPITAL = 0x14, //大小写锁定
      VK_A = 62
    }
    public Form1()
    {
      InitializeComponent();
    }
    public static bool GetState(VirtualKeys Key)
    {
      return (GetKeyState((int)Key)==1);
    }
    public static void SetState(VirtualKeys Key, bool State)
    {
      if (State != GetState(Key))
      {
        keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | 0, 0);
        keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
      }
    }
    //开启键盘大写
    private void btnOpenCAPITAL_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_CAPITAL, true);
    }
    //关闭键盘大写
    private void btnCloseCAPITAL_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_CAPITAL, false);
    }
    //开启键盘滚动锁定
    private void btnOpenScroll_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_SCROLL, true);
    }
    //关闭键盘滚动锁定
    private void btnCloseScroll_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_SCROLL, false);
    }
    //开启键盘数字锁定键
    private void btnOpenNum_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_NUMLOCK, true);
    }
    //关闭键盘数字锁定键
    private void btnCloseNum_Click(object sender, EventArgs e)
    {
      SetState(VirtualKeys.VK_NUMLOCK, false);
    }
  }
}