c# 注册了Ctrl+空格为热键，捕获后发送Ctrl+Shift

public partial class Form2 : Form
    {
        [DllImport("user32")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint control, Keys vk);
        //解除注册热键的api
        [DllImport("user32")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
        const int WM_HOTKEY = 0x0312;
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            //100为代号
            HotKey.RegisterHotKey(Handle, 100, HotKey.KeyModifiers.Ctrl, Keys.Space);
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            //100为代号
            HotKey.UnregisterHotKey(this.Handle, 100);
        }

        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_HOTKEY:
                {
                    switch (m.WParam.ToInt32())
                    {
                        case 100:
                        {
                            SendKeys.Send("^+");//SHIFT:+   CTRL:^
                            break;
                        }
                    }
                    break;
                }
            }
            base.WndProc(ref m);
        }  
    }

    public class HotKey
    {
        //如果函数执行成功，返回值不为0。  
        //如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。  
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RegisterHotKey(
            IntPtr hWnd,                //要定义热键的窗口的句柄  
            int id,                     //定义热键ID（不能与其它ID重复）             
            KeyModifiers fsModifiers,   //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效  
            Keys vk                     //定义热键的内容  
            );

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnregisterHotKey(
            IntPtr hWnd,                //要取消热键的窗口的句柄  
            int id                      //要取消热键的ID  
            );

        //定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）  
        [Flags()]
        public enum KeyModifiers
        {
            None = 0,
            Alt = 1,
            Ctrl = 2,
            Shift = 4,
            WindowsKey = 8
        }
    }