ch8_07.cs

《c#技术内幕代码》

using System;

class CH8_7
{
   public static void AddDay( ref DateTime dt )
   {
      TimeSpan ts = new TimeSpan(TimeSpan.TicksPerDay);
      dt = dt + ts;
   }
   public static void AddWeek( ref DateTime dt )
   {
      TimeSpan ts = new TimeSpan(TimeSpan.TicksPerDay);
      for ( int i=0; i<7; ++i )
         dt += ts;
   }
   public static void AddMonth( ref DateTime dt )
   {
      DateTime dt1 = dt.AddMonths( 1 );
      dt = dt1;
   }
   public static void AddYear( ref DateTime dt )
   {
      DateTime dt1 = dt.AddYears( 1 );
      dt = dt1;
   }
   
   public static void Main()
   {
      DateTime dt1 = DateTime.FromString("01/01/2001");
      DateTime dto = dt1;
      
      Console.WriteLine("Starting out: {0}", dt1 );
      
      AddDay ( ref dt1 );
      Console.WriteLine("Add a day: {0}", dt1 );
      
      TimeSpan ts = dt1 - dto;
      Console.WriteLine("Time Span: {0}", ts );
      dto = dt1;

      AddWeek( ref dt1 );
      Console.WriteLine("Add a week: {0}", dt1 );
      ts = dt1 - dto;
      Console.WriteLine("Time Span: {0}", ts );
      dto = dt1;

      AddMonth( ref dt1 );
      Console.WriteLine("Add a month: {0}", dt1 );
      ts = dt1 - dto;
      Console.WriteLine("Time Span: {0}", ts );
      dto = dt1;
   
      AddYear( ref dt1 );
      Console.WriteLine("Add a year: {0}", dt1 );
      ts = dt1 - dto;
      Console.WriteLine("Time Span: {0}", ts );
   }
}