点击Esc按钮关闭窗体

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        protected override bool ProcessCmdKey(ref System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData) 
        {
            int WM_KEYDOWN = 256;

            int WM_SYSKEYDOWN = 260;

            if (msg.Msg == WM_KEYDOWN | msg.Msg == WM_SYSKEYDOWN)
            {
                switch (keyData)
                {
                    case Keys.Escape:

                        this.Close();//esc关闭窗体

                        break;
                }
            }

            return false;
        }