如何计算基于一个生日年龄？ [英] How to calculate an age based on a birthday?

问题描述

  

可能重复：结果
  如何计算某人＆rsquo的;年龄在C＃中 <？ / p>

我想写返回给他或她的生日一个人的年龄一个ASP.NET的辅助方法。

我试过code是这样的：

 公共静态字符串年龄（这个的HtmlHelper助手，日期生日）
{
    返回（DateTime.Now  - 生日）; //？
}
 

但它不工作。什么是基于他们的生日来计算人的年龄的正确方法是什么？

解决方案

＃1使用这样的功能来确定用户的年龄。

如何计算一个人的年龄在C＃中？

给出的答案是

 现在的DateTime = DateTime.Today;
INT年龄= now.Year  -  bday.Year;
如果（现＆LT; bday.AddYears（年龄））age--;
 

所以，你的helper方法看起来像

 公共静态字符串年龄（这个的HtmlHelper助手，日期生日）
{
    现在的DateTime = DateTime.Today;
    INT年龄= now.Year  -  birthday.Year;
    如果（现＆LT; birthday.AddYears（年龄））age--;    返回age.ToString（）;
}
 

今天，我用不同版本的功能，包括一个参考日期。这让我找人的年龄在未来某一日期或过去。这是用于我们的预约系统中，其中需要在年龄在将来

 公共静态INT GetAge（DateTime的参考，日期生日）
{
    INT年龄= reference.Year  -  birthday.Year;
    如果（参考＆LT; birthday.AddYears（年龄））age--;    返回年龄;
}
 

Possible Duplicate:
How do I calculate someone’s age in C#?

I want to write an ASP.NET helper method which returns the age of a person given his or her birthday.

I've tried code like this:

public static string Age(this HtmlHelper helper, DateTime birthday)
{
    return (DateTime.Now - birthday); //??
}

But it's not working. What is the correct way to calculate the person's age based on their birthday?

解决方案

Stackoverflow uses such function to determine the age of a user.

How do I calculate someone's age in C#?

The given answer is

DateTime now = DateTime.Today;
int age = now.Year - bday.Year;
if (now < bday.AddYears(age)) age--;

So your helper method would look like

public static string Age(this HtmlHelper helper, DateTime birthday)
{
    DateTime now = DateTime.Today;
    int age = now.Year - birthday.Year;
    if (now < birthday.AddYears(age)) age--;

    return age.ToString();
}

Today, I use a different version of this function to include a date of reference. This allow me to get the age of someone at a future date or in the past. This is used for our reservation system, where the age in the future is needed.

public static int GetAge(DateTime reference, DateTime birthday)
{
    int age = reference.Year - birthday.Year;
    if (reference < birthday.AddYears(age)) age--;

    return age;
}

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