using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace DataMigrationClient
{
    public class API
    {
        public const int VK_LCONTROL = 162;
        public const int VK_RCONTROL = 163;

        /// <summary>
        /// 左Shift键
        /// </summary>
        public const int VK_LSHIFT = 160;
        /// <summary>
        /// 右Shift键
        /// </summary>
        public const int VK_RSHIFT = 161;

        [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "GetAsyncKeyState")]
        public static extern short GetAsyncKeyState(int vKey);
    }
}

//获取值
short value= API.GetAsyncKeyState(API.VK_LCONTROL);

c# 键值对照表