C#&.NET程序开发中根据已知的生日日期怎样计算某人的年龄呢？

4 个回答

• 0

  C#两个日期年份相减的实现方式，示例代码如下：

  var today = DateTime.Today;
  
  // 计算年龄
  var age = today.Year - birthdate.Year;
  
  // 如果是闰年出生，则年龄减一
  if (birthdate.Date > today.AddYears(-age)) age--;
  

  评论 分享

  

  Rector

  2021-10-08 回答
• 0

  使用C#创建的两种计算年龄的方法，代码如下：

  public int CalculateAge1(DateTime birthDate, DateTime now)
  {
      int age = now.Year - birthDate.Year;
      if (now.Month < birthDate.Month || (now.Month == birthDate.Month && now.Day < birthDate.Day))
          age--;
  
      return age;
  }
  
  public int CalculateAge2(DateTime birthDate, DateTime now)
  {
      int age = now.Year - birthDate.Year;
      if (birthDate > now.AddYears(-age))
          age--;
  
      return age;
  }
  

  评论 分享

  

  Rector

  2021-10-08 回答
• 0

  或者创建一个C#的静态扩展方法，代码如下：

  public static class DateTimeExtensions
  {
      public static int Age(this DateTime birthDate)
      {
          return Age(birthDate, DateTime.Now);
      }
  
      public static int Age(this DateTime birthDate, DateTime offsetDate)
      {
          int result=0;
          result = offsetDate.Year - birthDate.Year;
  
          if (offsetDate.DayOfYear < birthDate.DayOfYear)
          {
                result--;
          }
  
          return result;
      }
  }
  

  评论 分享

  

  Rector

  2021-10-08 回答
• 0

  以下是一个可以计算出多少天在内的年龄的方法，代码如下：

  public static string HowOld(DateTime birthday, DateTime now)
  {
      if (now < birthday)
          throw new ArgumentOutOfRangeException("生日必须小于参照日期.");
  
      TimeSpan diff = now - birthday;
      int diffDays = (int)diff.TotalDays;
  
      if (diffDays > 7)
      {
          int age = now.Year - birthday.Year;
  
          if (birthday > now.AddYears(-age))
              age--;
  
          if (age > 0)
          {
              return age + " 岁";
          }
          else
          {
              DateTime d = birthday;
              int diffMonth = 1;
  
              while (d.AddMonths(diffMonth) <= now)
              {
                  diffMonth++;
              }
  
              age = diffMonth-1;
  
              if (age == 1 && d.Day > now.Day)
                  age--;
  
              if (age > 0)
              {
                  return age + "个月";
              }
              else
              {
                  age = diffDays / 7;
                  return age + "周";
              }
          }
      }
      else if (diffDays > 0)
      {
          int age = diffDays;
          return age + "天";
      }
      else
      {
          int age = diffDays;
          return "刚出生";
      }
  }
  

  评论 分享

  

  Rector

  2021-10-08 回答