c# - c#中计算器中的键盘输入和管理光标

Question

我正在做一个计算器。我希望它也可以从键盘输入。这是我的代码的一部分。问题是，在键盘的第二个输入中，+ 号没有出现，它附加了“+”号，而从按钮单击输入时，它不显示 + 号。并告诉我为按钮单击和按键创建一个功能是否正确，或者我应该为每个功能分开？以及如何管理文本框中的光标？

private void button1_Click(object sender, EventArgs e)
    {
        yourArithmeticOperation = true;                 //Enable Arithmetic button click
        yourEqual = true;                               //Enable Equal button click
        if (yourNumberControl)                          //check number button to append or start new
        {
            if (yourControlClick)                       //check click button enabled or not
            {
                textBox1.Text += "1";                   //append no.

            }
            else
                return;
        }
        else
        {
            textBox1.Text = "1";                        //clear textbox and put new no.
            yourNumberControl = true;                    //Enable Number button click
        }


    }

private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.Add)
        {
            add();
        }

    }

    private void add()
    {
        yourEqual = false;                              //Disable equal button
        yourNumberControl = true;                       //enable number button
        if (yourArithmeticOperation)                    //check Arithmetic button
        {
            num1 = double.Parse(textBox1.Text);
            textBox1.Text = "";
            equal = "+";
            yourArithmeticOperation = false;            // disable arithmetic operator
        }
        else                                            //change the arithmeetic sign
        {
            textBox1.Text = "";
            equal = "+";
        }
    }