Question

我必须完成一个程序，其中包括打开一个包含数字的文件，显示它，然后还显示该文件有多少个数字以及它们的总和。

我目前对如何将所有读取的数字相加并显示：/

这是我的代码：

private void btnReadRandomNumbers_Click(object sender, EventArgs e)
{
    StreamReader inputFile;
    try
    {
        int number = 0;
        int count = 0;
        int sum = 0;
        lstRandomNumbers.Items.Clear();

        if (fodOpenFile.ShowDialog() == DialogResult.OK)
        {
            inputFile = File.OpenText(fodOpenFile.FileName);
            lstRandomNumbers.Items.Clear();

            while (!inputFile.EndOfStream)
            {
                number = int.Parse(inputFile.ReadLine());

                count = count + 1;
                lstRandomNumbers.Items.Add(number);
            }

            lblNumberCount.Text = count.ToString();
            lblSumNumbers.Text = number.ToString();
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("There is a problem with the disk file." + Environment.NewLine + ex.Message, "User Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
}

As seen in the Picture, the sum is only reading the last number of the list and im not sure why

感谢阅读！

Answer 1

第number = int.Parse(inputFile.ReadLine());行中的每行替换了数字！

您可以使用以下代码编写所有代码：

private void btnReadRandomNumbers_Click(object sender, EventArgs e)
{
    try
    {
        lstRandomNumbers.Items.Clear();

        if (fodOpenFile.ShowDialog() == DialogResult.OK)
        {
            var linesOfFile = File.ReadAllLines(fodOpenFile.FileName).Select(int.Parse).ToList();
            lblSumNumbers.Text = linesOfFile.Sum().ToString();
            lblNumberCount.Text = linesOfFile.Count().ToString();
            lstRandomNumbers.DataSource = linesOfFile;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("There is a problem with the disk file." + Environment.NewLine + ex.Message, "User Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
}

Answer 2

您快到了。稍作修改即可尝试使用相同的代码。我添加了嵌入式注释。

private void btnReadRandomNumbers_Click(object sender, EventArgs e)
{
    StreamReader inputFile;
    try
    {
    int number = 0;
    int count = 0;
    int sum = 0;
    //lstRandomNumbers.Items.Clear(); //don't need this

    if (fodOpenFile.ShowDialog() == DialogResult.OK)
    {
        inputFile = File.OpenText(fodOpenFile.FileName);
        //lstRandomNumbers.Items.Clear();//don't need this

        while (!inputFile.EndOfStream)
        {
            number = int.Parse(inputFile.ReadLine());

            count = count + 1;
            //lstRandomNumbers.Items.Add(number);//don't need this
            sum+=number; // add this
        }

        lblNumberCount.Text = count.ToString();
        lblSumNumbers.Text = sum.ToString(); //change `number' to `sum`
    }
    }
    catch (Exception ex)
    {
    MessageBox.Show("There is a problem with the disk file." + Environment.NewLine + ex.Message, "User Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
}

@Issa，如果有帮助，请告诉我。

Answer 3

尝试一下：

private void btnReadRandomNumbers_Click(object sender, EventArgs e)
{
    if (fodOpenFile.ShowDialog() == DialogResult.OK)
    {
        var lines = File.ReadAllLines(fodOpenFile.FileName);

        var result =
            lines
                .Select(x => int.Parse(x))
                .Aggregate(
                    new { count = 0, sum = 0 },
                    (a, x) => new { count = a.count + 1, sum = a.sum + x });

        lstRandomNumbers.Items.Clear();
        lstRandomNumbers.Items.AddRange(lines);
        lblNumberCount.Text = result.count.ToString();
        lblSumNumbers.Text = result.sum.ToString();
    }
}

Answer 4

  static void Main(string[] args)
    {
        var res = 0;
        var r = new Regex(@"\d");// you can try "\d+" and you will see the difference
        var matches = r.Matches("feawfwe312faewfa4gaeg1feaga67awfaw2");
        if (matches != null && matches.Count > 0)
        {
            foreach (var m in matches)
                res += int.Parse(m.ToString());
        }
        Console.WriteLine(res);
        Console.ReadKey();
    }

如何从文件中读取所有数字，然后将它们加在一起？

4 个答案: