unity 或者 c# 键盘监听

Question

报这个错，什么情况？还有就是，unity怎么重写键盘监听呐，求大神指点一二
Assets/Script/MidiKeyEvents.cs(36,38): error CS0246: The type or namespace name `KeyDownHandler' could not be found. Are you missing a using directive or an assembly reference?

internal class KeyInputMonitor
    {
        // 创建一个委托，返回类型为void，两个参数
    ****    public delegate void KeyDownHandler( object sender, KeyEventArgs e );****
        // 将创建的委托和特定事件关联,在这里特定的事件为KeyDown
        public event KeyDownHandler KeyDown;

        public void Run()
        {
            bool finished = false;
            do
            {       
                Console.WriteLine( "Input a char" );
                string response = Console.ReadLine();

                char responseChar = ( response == "" ) ? ' ' : char.ToUpper( response[0] );
                switch( responseChar )
                {
                case 'X':
                    finished = true;
                    break;

Answer 1

看错误应该是找不到命名空间，C#的很多库unity并没有，需要自己下载对应的dll文件导入到项目中。而且重写键盘监听我搞不来，只用过标准键盘来开发过。你是用到特殊键盘吗？普通的android，ios，摇杆，电脑键盘，unity自带的键盘监听就能搞定。