C#实现模拟按键的三种方式

// 模拟按键：A（异步）
private void button1_Click(object sender, EventArgs e)
{
    textBox1.Focus();
    SendKeys.Send("{A}");
}

// 模拟组合键：CTRL+A（同步）
private void button1_Click(object sender, EventArgs e)
{
    webBrowser1.Focus();
    SendKeys.SendWait("^{A}");
}

[DllImport("user32.dll")]
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
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);
}

[DllImport("user32.dll")]
public static extern int PostMessage(IntPtr hWnd, int Msg, Keys wParam, int lParam);

// 模拟按键：A（发送两次）
private void button1_Click(object sender, EventArgs e)
{
    textBox1.Focus();
    PostMessage(textBox1.Handle, WM_CHAR, Keys.A, 2);
}

// 组合键模拟（可能失效）
private void button1_Click(object sender, EventArgs e)
{
    webBrowser1.Focus();
    PostMessage(webBrowser1.Handle, WM_KEYDOWN, Keys.ControlKey, 0);
    PostMessage(webBrowser1.Handle, WM_KEYDOWN, Keys.A, 0);
}

using System.Runtime.InteropServices;
using System.Threading;

namespace KeyboardSimulator
{
    static class MyKey
    {
        [DllImport("user32.dll")]
        private static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);

        // 单键模拟（带延迟）
        public static void KeyPress(Keys keyCode, int wait)
        {
            keybd_event((byte)keyCode, 0, 0, 0);
            keybd_event((byte)keyCode, 0, 2, 0);
            Thread.Sleep(wait);
        }

        // 组合键模拟（Ctrl+...）
        public static void ControlKey(Keys keyCode)
        {
            keybd_event((byte)Keys.ControlKey, 0, 0, 0);
            keybd_event((byte)keyCode, 0, 0, 0);
            keybd_event((byte)keyCode, 0, 2, 0);
            keybd_event((byte)Keys.ControlKey, 0, 2, 0);
        }

        // 重复按键
        public static void KeyPressRep(Keys keyCode, int Times, int wait)
        {
            for (int i = 0; i < Times; i++)
                KeyPress(keyCode, wait);
        }

        // 数字串输入
        public static void TypeNums(string NumWords)
        {
            foreach (char c in NumWords)
                KeyPress((Keys)(48 + c), 50);
        }
    }
}