客户验证程序问题说明差异日期 [英] Customer Validator Problem Caluclate Difference Dates

问题描述

我有三个文本StartTextbox和EndTextBox，Textbox3.请小心textbox3(每月的月份数).现在，我希望开始日期和结束日期之间的差异是按月数检查的.

这在customvalidation中起作用:

I have three text StartTextbox and EndTextBox ,Textbox3 .Please careful textbox3(No of month). Now I want difference of start date and end date is Checked by No of Months .

Here function in customvalidation:

protected void ValidateDuration(object sender, ServerValidateEventArgs e)
    {
        DateTime start = DateTime.Parse(StartTextBox.Text);
        DateTime end = DateTime.Parse(EndTextBox.Text);

        
        int months = (end.Month - start.Month) + 12 * (end.Year - start.Year);

        e.IsValid = months <=TextBox3;
    }

推荐答案

你好

您无法使用此公式计算两个月之间的差额. (end.Month -start.Month)

想象end是4/29/2012而start是4/29/1995，结果将是0 :)

那你该怎么办?
看这个例子:

如果日子不重要

Hello

You can not calculate difference between 2 months with this formula. (end.Month - start.Month)

Imagine end is 4/29/2012 and start is 4/29/1995, the result will be 0 :)

So, what could you do?
Look at this sample:

If the day is not important

DateTime start = DateTime.Parse("4-2-2011");
DateTime end = DateTime.Now;


DateTime s = start;
int amount = 0;
while (s.Year != end.Year || s.Month != end.Month)
{
   s= s.AddMonths(1);
    amount++; //difference between 2 months
}

但是:如果一天很重要，那么可以将其添加到代码中:

But: If the day is important then you can add this to the code:

int days = s.Day -end.Day ;

if (days < 0)
    amount--;

为什么不使用TimeSpan

why don''t you use TimeSpan

TimeSpan ts = enddate - startdate;
int month = ts.Days / 30;

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