在system.dateTime.subtract上进行以下编辑 [英] Getting the following edit on a system.dateTime.subtract

问题描述

我收到此错误:

I am getting this error:

System.DateTime.Subtract(System.DateTime)' is a 'method', which is not valid in the given context

我的代码是:

my code is :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        double age = Math.Round(System.DateTime.Now.Subtract.Tostring(birthDate.Text).TotalDays * 365.25, 2);
        if (age < 21)
            validationResult.Text = "You are under 21.";
        else
            validationResult.Text = "You are 21 or older.";
    }
}

我对此还比较陌生.知道如何解决吗?

好的，我感谢收到的答复，但老实说，这根本没有帮助.这是我必须使用的代码.我应该找出问题所在并加以解决.我能够解决其他5个问题，但无法弄清楚如何解决此问题.给出的这些解决方案将不适用于该解决方案.我只需要知道如何摆脱这一修改.我尝试在其中扔一些()，但没有做任何工作.我疯狂地搜寻课本和互联网.有人可以告诉我编辑内容在此行中显示吗?

双倍年龄= Math.Round(System.DateTime.Now.Subtract.Tostring(birthDate.Text).TotalDays * 365.25，2);

有人可以直接告诉我该放在哪里吗.

I am relatively new to this. Any idea how to fix?

ok I appreciate the responses i have gotten but honestly that was no help at all. This is code that i have to use. I am supposed to find what is wrong with it and fix it. I was able to fix the other 5 problems but cant figure out how to fix this one. These solutions given will not work for that. I just needed to know how to get rid of this one edit. I tried throwing some () in there but nothing i did worked. I have scoured the text book and internet like crazy. Can someone just tell me the edit is showing on this line:

double age = Math.Round(System.DateTime.Now.Subtract.Tostring(birthDate.Text).TotalDays * 365.25, 2);

can someone just tell me straight forward what to put where. I would really appreciate it.

推荐答案

请注意，TimeSpan对象为您提供了一些有用的属性来确定持续时间.例如:

Note that the TimeSpan object gives you several useful properties for determining durations; example:

DateTime now = DateTime.Now;

// note you can use the subtract operator - directly
// and use a negative value with 'AddDays
TimeSpan difference = now - (now.AddDays(-2.4));

// days as a whole number
int diffDays = difference.Days;

// days including fractional value
double totalDays = difference.TotalDays;

int diffHours = difference.Hours;

double totalHours = difference.TotalHours;

我建​​议阅读此提示:使用年龄:与时间跨度不同！ [ ^ ]

I''d suggest to read this tip: Working with Age: it''s not the same as a TimeSpan![^]

要获取两个日期之间的差值，我们可以使用减法"方法.这是参数化的方法.在此处检查.

而不是像这样使用它:

To get the difference between two dates we can uses the "Subtract" method. It is a parameterised method.Check Here.

Instead of using it like:

报价:

double age = Math.Round(System.DateTime.Now.Subtract.Tostring(birthDate.Text).TotalDays * 365.25，2) ;

double age = Math.Round(System.DateTime.Now.Subtract.Tostring(birthDate.Text).TotalDays * 365.25, 2);

将其用作:

use it as:

double age = Math.Round(DateTime.Today.Subtract(new DateTime(1990, 07, 16)).TotalDays / 365.25, 2);

希望对您有所帮助:)

Hope it helps:)

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