清除阵列

Question

我在分配时遇到问题，我无法清除阵列。同样在我的MessageBox中显示分数时，无论我做什么，我都会得到零作为第一个数字。我无法弄清楚要改变什么，所以零不是第一个元素。

public partial class Form1 : Form
{
    int scoreTotal = 0;
    int scoreCount = 0;
    decimal average = 0;
    int[] scoreTotalArray = new int[1];

    public Form1()
    {
        InitializeComponent();
    }

    private void btnAdd_Click(object sender, EventArgs e)
    {
        try
        {
            if (IsValidData())
            {
                Int32 score = Convert.ToInt32(txtScore.Text);
                scoreTotalArray[scoreCount] = score;
                Array.Resize(ref scoreTotalArray, scoreTotalArray.Length + 1);
                scoreTotal += score; //accumulator
                scoreCount++; //counter
                average = scoreTotal / (decimal)scoreCount;//average

                txtScoreCount.Text = scoreCount.ToString();//display in score count txtbox
                txtScoreTotal.Text = scoreTotal.ToString(); //display in score total txtbox
                txtAverage.Text = average.ToString("n2"); //display in average text box

                txtScore.Clear();
                txtScore.Focus();
            }
        }
        catch (Exception ex) //catches all other exceptions
        {
            MessageBox.Show(ex.Message, ex.GetType().ToString());
        }
    }

    public bool IsValidData()
    {
        return
            IsPresent(txtScore, "Score:") &&
            IsInt32(txtScore, "Score:") &&
            IsWithinRange(txtScore, "Score:", 0, 100);
    }

    public bool IsPresent(TextBox textBox, string name)
    {
        if (textBox.Text == "")
        {
            MessageBox.Show(name + " is a required field, please enter a number between 0 and 100.", "Entry Error");
            textBox.Focus();
            return false;
        }
        return true;
    }

    public bool IsInt32(TextBox textBox, string name)
    {
        try
        {
            Convert.ToInt32(textBox.Text);
            return true;
        }
        catch (FormatException)
        {
            MessageBox.Show(name + "must be a number between 0 and 100.", "Entry Error");
            textBox.Focus();
            return false;
        }
    }

    public bool IsWithinRange(TextBox textBox, string name, decimal min, decimal max)
    {
        decimal number = Convert.ToDecimal(textBox.Text);
        if (number < min || number > max)
        {
            MessageBox.Show(name + " must be between " + min + " and " + max + ".", "Entry Error");
            textBox.Focus();
            return false;
        }
        return true;
    }

    private void btnDisplayScore_Click(object sender, EventArgs e)
    {
        Array.Sort(scoreTotalArray);
        string scoreCountString = "\n";
        for(int i = 0; i < scoreCount; i++)
        scoreCountString += scoreTotalArray [i] + "\n";

        MessageBox.Show(scoreCountString + "\n", "Sorted Scores");
    }

    private void btnClearScores_Click(object sender, EventArgs e)
    {
        txtScore.Clear();
        txtScoreTotal.Clear();
        txtScoreCount.Clear();
        txtAverage.Clear();

        txtScore.Focus();
    }

Answer 1

你的int数组scoreTotalArray总是一个元素。额外的元素包含你想要摆脱的0; - ）

清除分数可以通过将数组大小调整为0来完成。

那说：您应该考虑使用List而不是int数组。