计算持续时间 [英] calculating time duration

问题描述

hi ..请检查我的这个代码:

protected void Button4_Click(object sender, EventArgs e)
    {
        DateTime dt1;
        DateTime dt2;

        string currenttime1 = DateTime.Now.ToLongTimeString();
        string currenttime2 = DateTime.Now.ToLongTimeString();
        TextBox2.Text = currenttime2;

        dt1 = Convert.ToDateTime(currenttime1);
        dt2 = Convert.ToDateTime(currenttime2);
       
        TimeSpan ts = dt1 - dt2;

        int hours = ts.Hours;
        int min = ts.Minutes;

        string finalMin = Convert.ToString(min);

        TextBox3.Text = finalMin;

----我有一个网页，可以计算用户按下停止按钮时的持续时间..但是此代码的输出始终为零..我的错误是什么?
在此先感谢.. :)
--im使用asp.net和C#:confused:

解决方案

这是一个快速的控制台应用程序，您可以适应您的ASP.NET页面. "cs"> 使用系统； 命名空间 TimeDemo { class 程序 { 静态 无效 Main(字符串 []参数) { DateTime现在= DateTime.Now; 日期时间更早=现在.AddHours(-1); Console.WriteLine(" ，现在.ToLongTimeString()); Console.WriteLine(" ，更早.ToLongTimeString()); TimeSpan持续时间=现在-更早； Console.WriteLine(" ，duration.TotalMinutes)； Console.ReadKey(); } } }

您正在比较几乎在同一实例中检索到的两次，当然，两者的差将为0

Heaven23写道:

dt1 = Convert.ToDateTime(currenttime1);
dt2 = Convert.ToDateTime(currenttime2);

这一点绝对没用.您正在获取当前的DateTime，将其转换为字符串，然后转换回DateTime. :rolleyes:没用.

hi.. please check this code of mine:

protected void Button4_Click(object sender, EventArgs e)
    {
        DateTime dt1;
        DateTime dt2;

        string currenttime1 = DateTime.Now.ToLongTimeString();
        string currenttime2 = DateTime.Now.ToLongTimeString();
        TextBox2.Text = currenttime2;

        dt1 = Convert.ToDateTime(currenttime1);
        dt2 = Convert.ToDateTime(currenttime2);
       
        TimeSpan ts = dt1 - dt2;

        int hours = ts.Hours;
        int min = ts.Minutes;

        string finalMin = Convert.ToString(min);

        TextBox3.Text = finalMin;

---- i''m having a web page that calculated time duration when the user press the stop button.. but the output of this code is always zero.. what is my error?
thanks in advance.. :)
--im using asp.net and C# :confused:

解决方案

This is a quick console application which you can adapt to your ASP.NET page.

using System;

namespace TimeDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime now = DateTime.Now;
            DateTime earlier = now.AddHours(-1);
            Console.WriteLine("Now: {0}", now.ToLongTimeString());
            Console.WriteLine("Earlier: {0}", earlier.ToLongTimeString());

            TimeSpan duration = now - earlier;
            Console.WriteLine("Duration {0} minutes", duration.TotalMinutes);

            Console.ReadKey();
        }
    }
}

You are comparing two times retrieved at virtually the same instance, of course the difference will be 0

Heaven23 wrote:

dt1 = Convert.ToDateTime(currenttime1);
dt2 = Convert.ToDateTime(currenttime2);

This bit is absolutely useless. You are getting the current DateTime, converting it to a string, then converting back to a DateTime. :rolleyes: Useless.

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