用户单击消息对话框“确定”按钮时重新启动代码

Question

I am trying to spice up my code for a simple number guessing game I am making. Once the user guesses the proper number a message dialogue box pops up telling him he is a winner. That message dialogue box has one button named "ok" when I click it I am taken back to the form.

Instead I would like it to restart the code so that a new random number is generated. Is this possible or do I need to manually revert the code back to its default state within the winner code area?

Here is my code now:

    private void btnEval_Click (object sender, EventArgs e)
    {
        // increment the counter to be displayed later
        howManyClicks++;



        // main decision conditions, ensures something is entered
        if (txtNum.Text != "")
        {
            // user input number
            double num = double.Parse (txtNum.Text);

            if (randomNumber > num)
            {
                // if too low
                this.BackColor = Color.Yellow;
                lblMain.Text = "TOO LOW!";
                lblReq.Text = "please try again";
                txtNum.Clear ();
                txtNum.Focus ();

            }
            else if (randomNumber < num)
            {
                // if too high
                this.BackColor = Color.Red;
                lblMain.Text = "TOO HIGH!";
                lblReq.Text = "please try again";
                txtNum.Clear ();
                txtNum.Focus ();
            }
            else
            {
                // correct
                this.BackColor = Color.Green;
                lblMain.Text = "CORRECT!";
                lblReq.Text = "well done";
                MessageBox.Show ("You are right!! It took you " + howManyClicks + " guesses", "You are a WINNER!!",
                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
                txtNum.Clear ();
                txtNum.Focus ();
            }
        }
        else
        {
            MessageBox.Show ("You must enter a vaild number! Please try again.", "ERROR",
                MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
            txtNum.Clear ();
            txtNum.Focus ();
        }

Answer 1

Apparently, your "game state" ( howManyClicks , randomNumber , ...) is stored in instance variables of the form. Thus, you have the following options:

---

Extract the game state into its own class and keep only a reference to an instance of this class in your form:

GameState state;

When you start or restart the game, just assign a new GameState() to state and reset the user interface elements of the form.

---

Alternatively, you can close and reopen the form. Your main loop could look something like this:

while (true) {
    var form = new GameForm();
    var result = form.ShowDialog(); // waits until the form as been closed

    if (result == DialogResult.Cancel) {
        break;  // The user wants to stop playing
    }
}

In your game form, when the OK button is clicked, you set Me.DialogResult to DialogResult.OK and then close the form. The outer loop will automatically reopen a new, empty game form.

Answer 2

Simply make function for this code.

Select all the code and then right click on it, select second option: Refactor

Select suboption: Extract a method .

You can give name for this public method.

Then you can call this method from anywhere,( as you have mentioned restart the code).