1.System.Windows.Forms.SendKeys

组合键：Ctrl = ^ 、Shift = + 、Alt = %

模拟按键：A

private void button1_Click(object sender, EventArgs e)

{

textBox1.Focus();

SendKeys.Send("{A}");

}

模拟组合键：CTRL + A

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)

//这种方式适用于WinForm程序，在Console程序以及WPF程序中不适用

2.keybd_event

DLL引用

[DllImport("user32.dll", EntryPoint = "keybd_event", SetLastError = true)]

public static extern void keybd_event(Keys bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

模拟按键：A

private void button1_Click(object sender, EventArgs e)

{

textBox1.Focus();

keybd_event(Keys.A, 0, 0, 0);

}

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);

}

3.PostMessage

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);

}

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1

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);

}