【Winform】键 盘 事 件

        private void richTextBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            char[] chars = new char[] { (char), (char), (char), (char), (char) };   //回车 Backspace键 *键 .键 /键
            if (!(char.IsNumber(e.KeyChar)) && !chars.Contains(e.KeyChar))
            {
                e.Handled = true;
            }
        }