winform 快捷键的两种实现方法

• 方法1：只当焦点在当前控件上有效

        private void pictureBox1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)        {            if (e.KeyCode == Keys.Escape)                this.Dispose();            if (e.KeyCode == Keys.Space)                pictureBox_relocation();        }

• 方法2：当前窗体处于激活状态有效

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)        {            KeyEventArgs e = new KeyEventArgs(keyData);            if (keyData == (Keys.Alt | Keys.P))            {                //do something            }            return false;        }