各位大侠，我的键盘事件能实现。就
是不能判断，不管我输入什么他都照样显示
我在Form1_KeyDown下的代码不管有没有限制都照样输出
这是我的代码
 private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            int n;
            string m;

            m = textBox1.Text;
            n = int.Parse(e.KeyValue.ToString());
            if (n >= 96 && n < 106)
            {
                n = n - 96;
                computer.Numbers_click(ref m, n);
                textBox1.Text = m;

            }
            else
            {

                char op = ' ';
                switch (e.KeyCode)
                {
                    case Keys.Decimal: computer.Dot(ref m); break;
                    case Keys.Divide: op = '/'; break;
                    case Keys.Subtract: op = '-'; break;
                    case Keys.Multiply: op = '*'; break;
                    case Keys.Add: op = '+'; break;
                    case Keys.Enter: op = '='; break;
                    default: return;
                }
                computer.Operators_click(ref m, op);
                textBox1.Text = m;
            }
        }