模拟按键在.Net中有三种方式实现。
第一种方式：System.Windows.Forms.SendKeys
组合键：Ctrl = ^ 、Shift = 、Alt = %
模拟按键：A
代码语言：javascript复制 private void button1_Click(object sender, EventArgs e)
{
textBox1.Focus();
SendKeys.Send("{A}");
}模拟组合键：CTRL A
代码语言：javascript复制 private void button1_Click(object sender, EventArgs e)
{
webBrowser1.Focus();
SendKeys.Send("^{A}");
}SendKeys.Send // 异步模拟按键(不阻塞UI)
SendKeys.SendWait // 同步模拟按键(会阻塞UI直到对方处理完消息后返回)
第二种方式：keybd_event
模拟按键：A
代码语言：javascript复制 [DllImport("user32.dll", EntryPoint = "keybd_event", SetLastError = true)]
public static extern void keybd_event(Keys bVk, byte bScan, uint dwFlags, uint dwExtraInfo);
private void button1_Click(object sender, EventArgs e)
{
textBox1.Focus();
keybd_event(Keys.A, 0, 0, 0);
}</pre> 模拟组合键：CTRL A
public const int KEYEVENTF_KEYUP = 2;
private void button1_Click(object sender, EventArgs e)
{
webBrowser1.Focus();
keybd_event(Keys.ControlKey, 0, 0, 0);
keybd_event(Keys.A, 0, 0, 0);
keybd_event(Keys.ControlKey, 0, KEYEVENTF_KEYUP, 0);
}</pre> 上面两种方式都是全局范围呢，现在介绍如何对单个窗口进行模拟按键
模拟按键：A / 两次
[DllImport("user32.dll", EntryPoint = "PostMessageA", SetLastError = true)]
public static extern int PostMessage(IntPtr hWnd, int Msg, Keys wParam, int lParam);
public const int WM_CHAR = 256;
private void button1_Click(object sender, EventArgs e)
{
textBox1.Focus();
PostMessage(textBox1.Handle, 256, Keys.A, 2);
}</pre>
模拟组合键：CTRL A
如下方式可能会失效，所以最好采用上述两种方式
public const int WM_KEYDOWN = 256;
public const int WM_KEYUP = 257;
private void button1_Click(object sender, EventArgs e)
{
webBrowser1.Focus();
keybd_event(Keys.ControlKey, 0, 0, 0);
keybd_event(Keys.A, 0, 0, 0);
PostMessage(webBrowser1.Handle, WM_KEYDOWN, Keys.A, 0);
keybd_event(Keys.ControlKey, 0, KEYEVENTF_KEYUP, 0);
}</pre> 
