如何在C＃.net中计算一个人的年龄 [英] How to calculte a person's age in C#.net

问题描述

我想编写一个代码，通过从用户那里获取生日来计算一个人的年龄。使用日期时间函数。

I want to write a code to calculate a person''s age by taking birthdate from the user. Using datetime function.

推荐答案

嗯。为什么MSDN帮助没有告诉你那个？它看起来很明显：

Hm. How come the MSDN help did not tell you that? It looks so obvious:

System.DateTime birthTime = AskTheUser(myUser); // :-)
System.DateTime now = System.DateTime.Now;
System.TimeSpan age = now - birthTime; //as simple as that
double ageInDays = age.TotalDays; // will you convert to whatever you want yourself?

-SA

DateTime birthdate = new DateTime(1981, 1, 7);
DateTime now = DateTime.Now;
int years = now.Year - birthdate.Year;
if (now.Month < birthdate.Month || (now.Month == birthdate.Month && now.Day < birthdate.Day))
  years--;
MessageBox.Show(years.ToString());

使用 时间段库 [ ^ ]：

Using the Time Period Library[^]:

// ----------------------------------------------------------------------
public void AgeSample( DateTime birthDay )
{
  // output: x Year x Months
  Console.WriteLine( new DateDiff( birthDay ).GetDescription( 2 ) );
} // AgeSample

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