如何根据生日来计算年龄？
可能重复：
我如何用C＃计算某人的年龄？
我想编写一个ASP.NET帮助程序方法，该方法返回给定生日的人的年龄。
我试过这样的代码：
public static string Age(this HtmlHelper helper, DateTime birthday)
{
return (DateTime.Now - birthday); //??
}
但它不起作用。 根据生日计算人的年龄的正确方法是什么？
Stackoverflow使用这样的函数来确定用户的年龄。
用C＃计算年龄
给出的答案是
DateTime now = DateTime.Today;
int age = now.Year - bday.Year;
if (now < bday.AddYears(age)) age--;
所以你的帮手方法看起来像
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();
}
今天，我使用这个函数的不同版本来包含引用日期。 这使我可以在未来或过去获得某人的年龄。 这用于我们的预订系统，需要将来的年龄。
public static int GetAge(DateTime reference, DateTime birthday)
{
int age = reference.Year - birthday.Year;
if (reference < birthday.AddYears(age)) age--;
return age;
}
来自古老线索的另一个聪明的方式：
int age = (
Int32.Parse(DateTime.Today.ToString("yyyyMMdd")) -
Int32.Parse(birthday.ToString("yyyyMMdd"))) / 10000;
我这样做：
（缩短了一下代码）
public struct Age
{
public readonly int Years;
public readonly int Months;
public readonly int Days;
}
public Age( int y, int m, int d ) : this()
{
Years = y;
Months = m;
Days = d;
}
public static Age CalculateAge ( DateTime birthDate, DateTime anotherDate )
{
if( startDate.Date > endDate.Date )
{
throw new ArgumentException ("startDate cannot be higher then endDate", "startDate");
}
int years = endDate.Year - startDate.Year;
int months = 0;
int days = 0;
// Check if the last year, was a full year.
if( endDate < startDate.AddYears (years) && years != 0 )
{
years--;
}
// Calculate the number of months.
startDate = startDate.AddYears (years);
if( startDate.Year == endDate.Year )
{
months = endDate.Month - startDate.Month;
}
else
{
months = ( 12 - startDate.Month ) + endDate.Month;
}
// Check if last month was a complete month.
if( endDate < startDate.AddMonths (months) && months != 0 )
{
months--;
}
// Calculate the number of days.
startDate = startDate.AddMonths (months);
days = ( endDate - startDate ).Days;
return new Age (years, months, days);
}
// Implement Equals, GetHashCode, etc... as well
// Overload equality and other operators, etc...
}
链接地址: http://www.djcxy.com/p/54347.html