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使用System.Windows.Forms.SendKeys模拟键盘操作：

csharpprivate void button1_Click(object sender, EventArgs e){ textBox1.Focus(); SendKeys.Send(+{A});}模拟组合键Ctrl + A：private void button2_Click(object sender, EventArgs e){ SendKeys.Send(%{A});}模拟组合键Shift + A：private void button3_Click(object sender, EventArgs e){ SendKeys.Send(+{A});}模拟组合键Alt + A：private void button4_Click(object sender, EventArgs e){ SendKeys.Send(%{A});}

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

1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); }