首先创建一个KeyBoard类，代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;using System.Threading;namespace KeyBoardInput{    class KeyBoard    {        [DllImport("user32.dll")]        private static extern void keybd_event(            byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);        private static Dictionary
     
       keycodedic;        const int KEYEVENTF_KEYUP = 0x0002;        public static bool Input(string str)        {            #region init dic            if (keycodedic == null)            {                keycodedic = new Dictionary
      
       ();                keycodedic.Add("A", 0x41);                keycodedic.Add("B", 0x42);                keycodedic.Add("C", 0x43);                keycodedic.Add("D", 0x44);                keycodedic.Add("E", 0x45);                keycodedic.Add("F", 70);                keycodedic.Add("G", 0x47);                keycodedic.Add("H", 0x48);                keycodedic.Add("I", 0x49);                keycodedic.Add("J", 0x4a);                keycodedic.Add("K", 0x4b);                keycodedic.Add("L", 0x4c);                keycodedic.Add("M", 0x4d);                keycodedic.Add("N", 0x4e);                keycodedic.Add("O", 0x4f);                keycodedic.Add("P", 80);                keycodedic.Add("Q", 0x51);                keycodedic.Add("R", 0x52);                keycodedic.Add("S", 0x53);                keycodedic.Add("T", 0x54);                keycodedic.Add("U", 0x55);                keycodedic.Add("V", 0x56);                keycodedic.Add("W", 0x57);                keycodedic.Add("X", 0x58);                keycodedic.Add("Y", 0x59);                keycodedic.Add("Z", 90);                keycodedic.Add("0", 0x30);                keycodedic.Add("1", 0x31);                keycodedic.Add("2", 50);                keycodedic.Add("3", 0x33);                keycodedic.Add("4", 0x34);                keycodedic.Add("5", 0x35);                keycodedic.Add("6", 0x36);                keycodedic.Add("7", 0x37);                keycodedic.Add("8", 0x38);                keycodedic.Add("9", 0x39);                keycodedic.Add(".", 110);                keycodedic.Add("LEFT", 0x25);                keycodedic.Add("UP", 0x26);                keycodedic.Add("RIGHT", 0x27);                keycodedic.Add("DOWN", 40);                keycodedic.Add("-", 0x6d);            }            #endregion            foreach (char ch in str.ToUpper())            {                //模拟单击键，可规避连续输入键值时遗漏或延长Thread.Sleep(50);                keybd_event(0x1, 0, 1, 0);                keybd_event(keycodedic[ch.ToString()], 0, 1, 0);            }            return false;        }        public static void Move(int count, string direction)        {            for (int i = 0; i < count; i++)            {                keybd_event(keycodedic[direction], 0, 0, 0);                Thread.Sleep(100);            }            if (count == 1)            {                Thread.Sleep(0x3e8);            }        }        public static void Enter()        {            keybd_event(0xD, 0, 0, 0);            Thread.Sleep(50);            keybd_event(0xD, 0, KEYEVENTF_KEYUP, 0);        }        public static void Shift()        {            keybd_event(0x10, 0, 0, 0);            Thread.Sleep(50);            keybd_event(0x10, 0, KEYEVENTF_KEYUP, 0);        }        public static void Capslock()        {            keybd_event(0x14, 0, 0, 0);            Thread.Sleep(50);            keybd_event(0x14, 0, KEYEVENTF_KEYUP, 0);        }        public static void CtrlV()        {            keybd_event(0x11, 0, 0, 0);            keybd_event(0x56, 0, 0, 0);            keybd_event(0x56, 0, KEYEVENTF_KEYUP, 0);            keybd_event(0x11, 0, KEYEVENTF_KEYUP, 0);        }        public static void CtrlC()        {            keybd_event(0x11, 0, 0, 0);            keybd_event(0x43, 0, 0, 0);            keybd_event(0x43, 0, KEYEVENTF_KEYUP, 0);            keybd_event(0x11, 0, KEYEVENTF_KEYUP, 0);        }        public static void CtrlA()        {            keybd_event(0x11, 0, 0, 0);            keybd_event(0x41, 0, 0, 0);            keybd_event(0x41, 0, KEYEVENTF_KEYUP, 0);            keybd_event(0x11, 0, KEYEVENTF_KEYUP, 0);        }        public static void CtrlX()        {            keybd_event(0x11, 0, 0, 0);            keybd_event(0x58, 0, 0, 0);            keybd_event(0x58, 0, KEYEVENTF_KEYUP, 0);            keybd_event(0x11, 0, KEYEVENTF_KEYUP, 0);        }    }}
      
     

模拟输入：

private void button1_Click(object sender, EventArgs e)        {            this.textBox1.Focus();            KeyBoard.Input("abcde");            KeyBoard.Enter();            KeyBoard.Input("123456");            KeyBoard.Enter();        }

复制粘贴剪切：

private void button2_Click(object sender, EventArgs e)        {            this.textBox1.Focus();            KeyBoard.CtrlV();        }        private void button3_Click(object sender, EventArgs e)        {            this.textBox1.Focus();            KeyBoard.CtrlX();        }        private void button5_Click(object sender, EventArgs e)        {            this.textBox1.Focus();            KeyBoard.CtrlA();        }        private void button4_Click(object sender, EventArgs e)        {            this.textBox1.Focus();            KeyBoard.CtrlC();        }

全选，先定义事件:

//添加从键盘按ctrl+a全选事件        private void textBox1_KeyUp(object sender, KeyEventArgs e)        {            if (e.Modifiers == Keys.Control && e.KeyCode == Keys.A)            {                ((TextBox)sender).SelectAll();                this.textBox1.Focus();            }        }        //添加双击textbox全选事件        private void textBox1_MouseDoubleClick(object sender, MouseEventArgs e)        {            textBox1.Select(0, textBox1.Text.Length);        }