计时器如何将应用程序开始时间和应用程序结束时间保存到文本文件？

Question

我必须制作一个将开始时间和停止时间写入文本文件的winform应用程序，以便文本文件中的数据可以用于在图表中显示。现在我已经设法让计时器在文本文件中写入开始和停止时间，但计时器会写入完整的持续时间

即; 8/13/2014 8:33:57 PM 8/13/2014 8:33:57 PM 8/13/2014 8:33:58 PM 8/13/2014 8:33:58 PM 8/13/2014 8:33:59 PM 8/13/2014 8:33:59 PM 8/13/2014 8:34:00 PM

但我希望计时器只写开始时间和结束时间。

using System;
using System.Windows.Forms;
using System.IO;
using System.Text;

namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

        timer1.Start();

    }


    private void timer1_Tick(object sender, EventArgs e)
    {

      FileStream fs = new FileStream(@"D:\Hello.txt", FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
        //FileStream fs = new FileStream(@"E:\log{0:yyyy-MM-dd HH:mm:ss}.txt", FileMode.Append, FileAccess.Write, FileShare.ReadWrite),sb.ToString());
        StreamWriter sw = new StreamWriter(fs);
        sw.WriteLine(DateTime.Now.Hour);

        lbTimer.Items.Add(DateTime.Now.Hour+"Hours");
        lbTimer1.Items.Add(DateTime.Now.Minute+"M");
        lbTimer2.Items.Add(DateTime.Now.Second+"s");
        fs.Flush();
        sw.Close();
        fs.Close();

    }
}

}

Answer 1

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        File.AppendAllText("D:\\Hello.txt", DateTime.Now.ToString());
    }

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        File.AppendAllText("D:\\Hello.txt", DateTime.Now.ToString());
    }
}

Answer 2

你可以试试这个……

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        using (System.IO.StreamWriter streamWriter = new StreamWriter("Report.txt", false)) 
        {
            streamWriter.WriteLine(string.Format("Start Time : {0:yyyy-MM-dd HH:mm:ss}", DateTime.Now));
        }
    }

    private void Form_Closed(object sender, EventArgs e)
    {
        using (System.IO.StreamWriter streamWriter = new StreamWriter("Report.txt", true)) 
        {
            streamWriter.WriteLine(string.Format("End Time : {0:yyyy-MM-dd HH:mm:ss}", DateTime.Now));
        }
    }
}

Answer 3

这可能是一种选择，收集所有日期并写入文件一次：

        string path = @"yourpathhere";
        List<string> dates = new List<string>();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            dates.Add(DateTime.Now.ToString());
        }

        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            dates.Add(DateTime.Now.ToString());
            File.WriteAllText(path, dates.Aggregate((d1, d2) => d1 + "\r\n" + d2));
        }