Calendar.AddYears(DateTime, Int32) Calendar.AddYears(DateTime, Int32) Calendar.AddYears(DateTime, Int32) Calendar.AddYears(DateTime, Int32) Method

定义

当在派生类中重写时,将返回与指定 DateTime 相距指定年数的 DateTimeWhen overridden in a derived class, returns a DateTime that is the specified number of years away from the specified DateTime.

public:
 abstract DateTime AddYears(DateTime time, int years);
public abstract DateTime AddYears (DateTime time, int years);
abstract member AddYears : DateTime * int -> DateTime
Public MustOverride Function AddYears (time As DateTime, years As Integer) As DateTime

参数

time
DateTime DateTime DateTime DateTime

将向其添加年数的 DateTimeThe DateTime to which to add years.

years
Int32 Int32 Int32 Int32

要添加的年数。The number of years to add.

返回

将指定年数添加到指定的 DateTime 中时得到的 DateTimeThe DateTime that results from adding the specified number of years to the specified DateTime.

异常

得到的 DateTime 超出了此日历支持的范围。The resulting DateTime is outside the supported range of this calendar.

years 超出了 DateTime 返回值支持的范围。years is outside the supported range of the DateTime return value.

示例

下面的代码示例演示Calendar类的成员。The following code example demonstrates the members of the Calendar class.

using namespace System;
using namespace System::Globalization;
void DisplayValues( Calendar^ myCal, DateTime myDT )
{
   Console::WriteLine( "   Era: {0}", myCal->GetEra( myDT ) );
   Console::WriteLine( "   Year: {0}", myCal->GetYear( myDT ) );
   Console::WriteLine( "   Month: {0}", myCal->GetMonth( myDT ) );
   Console::WriteLine( "   DayOfYear: {0}", myCal->GetDayOfYear( myDT ) );
   Console::WriteLine( "   DayOfMonth: {0}", myCal->GetDayOfMonth( myDT ) );
   Console::WriteLine( "   DayOfWeek: {0}", myCal->GetDayOfWeek( myDT ) );
   Console::WriteLine( "   Hour: {0}", myCal->GetHour( myDT ) );
   Console::WriteLine( "   Minute: {0}", myCal->GetMinute( myDT ) );
   Console::WriteLine( "   Second: {0}", myCal->GetSecond( myDT ) );
   Console::WriteLine( "   Milliseconds: {0}", myCal->GetMilliseconds( myDT ) );
   Console::WriteLine();
}

int main()
{
   
   // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
   DateTime myDT = DateTime(2002,4,3,gcnew GregorianCalendar);
   
   // Uses the default calendar of the InvariantCulture.
   Calendar^ myCal = CultureInfo::InvariantCulture->Calendar;
   
   // Displays the values of the DateTime.
   Console::WriteLine( "April 3, 2002 of the Gregorian calendar:" );
   DisplayValues( myCal, myDT );
   
   // Adds 5 to every component of the DateTime.
   myDT = myCal->AddYears( myDT, 5 );
   myDT = myCal->AddMonths( myDT, 5 );
   myDT = myCal->AddWeeks( myDT, 5 );
   myDT = myCal->AddDays( myDT, 5 );
   myDT = myCal->AddHours( myDT, 5 );
   myDT = myCal->AddMinutes( myDT, 5 );
   myDT = myCal->AddSeconds( myDT, 5 );
   myDT = myCal->AddMilliseconds( myDT, 5 );
   
   // Displays the values of the DateTime.
   Console::WriteLine( "After adding 5 to each component of the DateTime:" );
   DisplayValues( myCal, myDT );
}

/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar:
Era:          1
Year:         2002
Month:        4
DayOfYear:    93
DayOfMonth:   3
DayOfWeek:    Wednesday
Hour:         0
Minute:       0
Second:       0
Milliseconds: 0

After adding 5 to each component of the DateTime:
Era:          1
Year:         2007
Month:        10
DayOfYear:    286
DayOfMonth:   13
DayOfWeek:    Saturday
Hour:         5
Minute:       5
Second:       5
Milliseconds: 5

*/
using System;
using System.Globalization;


public class SamplesCalendar  {

   public static void Main()  {

      // Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      DateTime myDT = new DateTime( 2002, 4, 3, new GregorianCalendar() );

      // Uses the default calendar of the InvariantCulture.
      Calendar myCal = CultureInfo.InvariantCulture.Calendar;

      // Displays the values of the DateTime.
      Console.WriteLine( "April 3, 2002 of the Gregorian calendar:" );
      DisplayValues( myCal, myDT );

      // Adds 5 to every component of the DateTime.
      myDT = myCal.AddYears( myDT, 5 );
      myDT = myCal.AddMonths( myDT, 5 );
      myDT = myCal.AddWeeks( myDT, 5 );
      myDT = myCal.AddDays( myDT, 5 );
      myDT = myCal.AddHours( myDT, 5 );
      myDT = myCal.AddMinutes( myDT, 5 );
      myDT = myCal.AddSeconds( myDT, 5 );
      myDT = myCal.AddMilliseconds( myDT, 5 );

      // Displays the values of the DateTime.
      Console.WriteLine( "After adding 5 to each component of the DateTime:" );
      DisplayValues( myCal, myDT );

   }

   public static void DisplayValues( Calendar myCal, DateTime myDT )  {
      Console.WriteLine( "   Era:          {0}", myCal.GetEra( myDT ) );
      Console.WriteLine( "   Year:         {0}", myCal.GetYear( myDT ) );
      Console.WriteLine( "   Month:        {0}", myCal.GetMonth( myDT ) );
      Console.WriteLine( "   DayOfYear:    {0}", myCal.GetDayOfYear( myDT ) );
      Console.WriteLine( "   DayOfMonth:   {0}", myCal.GetDayOfMonth( myDT ) );
      Console.WriteLine( "   DayOfWeek:    {0}", myCal.GetDayOfWeek( myDT ) );
      Console.WriteLine( "   Hour:         {0}", myCal.GetHour( myDT ) );
      Console.WriteLine( "   Minute:       {0}", myCal.GetMinute( myDT ) );
      Console.WriteLine( "   Second:       {0}", myCal.GetSecond( myDT ) );
      Console.WriteLine( "   Milliseconds: {0}", myCal.GetMilliseconds( myDT ) );
      Console.WriteLine();
   }

}


/*
This code produces the following output.

April 3, 2002 of the Gregorian calendar:
   Era:          1
   Year:         2002
   Month:        4
   DayOfYear:    93
   DayOfMonth:   3
   DayOfWeek:    Wednesday
   Hour:         0
   Minute:       0
   Second:       0
   Milliseconds: 0

After adding 5 to each component of the DateTime:
   Era:          1
   Year:         2007
   Month:        10
   DayOfYear:    286
   DayOfMonth:   13
   DayOfWeek:    Saturday
   Hour:         5
   Minute:       5
   Second:       5
   Milliseconds: 5

*/
Imports System.Globalization


Public Class SamplesCalendar   

   Public Shared Sub Main()

      ' Sets a DateTime to April 3, 2002 of the Gregorian calendar.
      Dim myDT As New DateTime(2002, 4, 3, New GregorianCalendar())

      ' Uses the default calendar of the InvariantCulture.
      Dim myCal As Calendar = CultureInfo.InvariantCulture.Calendar

      ' Displays the values of the DateTime.
      Console.WriteLine("April 3, 2002 of the Gregorian calendar:")
      DisplayValues(myCal, myDT)

      ' Adds 5 to every component of the DateTime.
      myDT = myCal.AddYears(myDT, 5)
      myDT = myCal.AddMonths(myDT, 5)
      myDT = myCal.AddWeeks(myDT, 5)
      myDT = myCal.AddDays(myDT, 5)
      myDT = myCal.AddHours(myDT, 5)
      myDT = myCal.AddMinutes(myDT, 5)
      myDT = myCal.AddSeconds(myDT, 5)
      myDT = myCal.AddMilliseconds(myDT, 5)

      ' Displays the values of the DateTime.
      Console.WriteLine("After adding 5 to each component of the DateTime:")
      DisplayValues(myCal, myDT)

   End Sub

   Public Shared Sub DisplayValues(myCal As Calendar, myDT As DateTime)
      Console.WriteLine("   Era:          {0}", myCal.GetEra(myDT))
      Console.WriteLine("   Year:         {0}", myCal.GetYear(myDT))
      Console.WriteLine("   Month:        {0}", myCal.GetMonth(myDT))
      Console.WriteLine("   DayOfYear:    {0}", myCal.GetDayOfYear(myDT))
      Console.WriteLine("   DayOfMonth:   {0}", myCal.GetDayOfMonth(myDT))
      Console.WriteLine("   DayOfWeek:    {0}", myCal.GetDayOfWeek(myDT))
      Console.WriteLine("   Hour:         {0}", myCal.GetHour(myDT))
      Console.WriteLine("   Minute:       {0}", myCal.GetMinute(myDT))
      Console.WriteLine("   Second:       {0}", myCal.GetSecond(myDT))
      Console.WriteLine("   Milliseconds: {0}", myCal.GetMilliseconds(myDT))
      Console.WriteLine()
   End Sub

End Class


'This code produces the following output.

'

'April 3, 2002 of the Gregorian calendar:

'   Era:          1

'   Year:         2002

'   Month:        4

'   DayOfYear:    93

'   DayOfMonth:   3

'   DayOfWeek:    Wednesday

'   Hour:         0

'   Minute:       0

'   Second:       0

'   Milliseconds: 0

'

'After adding 5 to each component of the DateTime:

'   Era:          1

'   Year:         2007

'   Month:        10

'   DayOfYear:    286

'   DayOfMonth:   13

'   DayOfWeek:    Saturday

'   Hour:         5

'   Minute:       5

'   Second:       5

'   Milliseconds: 5

注解

该值将添加到指定DateTime的中。 yearsThe years value is added to the specified DateTime. 如果years为负, 则生成DateTime的早于指定DateTime的。If years is negative, the resulting DateTime is earlier than the specified DateTime.

如果生成的日期不是DateTime结果年份的结果月份中的有效日期, 则结果中的日部分会受到影响。The day part of the resulting DateTime is affected if the resulting day is not a valid day in the resulting month of the resulting year. 它将更改为生成的年份中的最后一个有效日。It is changed to the last valid day in the resulting month of the resulting year. 如果结果月份不是结果DateTime年份中的有效月份, 则生成的的月份部分会受到影响。The month part of the resulting DateTime is affected if the resulting month is not a valid month in the resulting year. 它将更改为结果年份中的最后一个有效月份。It is changed to the last valid month in the resulting year. 如果结果年份在指定DateTime DateTime的纪元以外, 则会影响得到的纪元部分。The era part of the resulting DateTime is affected if the resulting year is outside the era of the specified DateTime. 生成DateTime的的时间部分与指定DateTime的相同。The time-of-day part of the resulting DateTime remains the same as the specified DateTime.

例如, 在公历中, 2 月有28天, 但在闰年有29天的情况除外。For example, in the Gregorian calendar, February has 28 days, except during a leap year when it has 29 days. 如果指定的日期是闰年中2月29日的值, 并且的值years为 1, 则生成的日期为下一年2月28日。If the specified date is the 29th day of February in a leap year and the value of years is 1, the resulting date is the 28th day of February in the following year.

如果years为负, 则生成DateTime的早于指定DateTime的。If years is negative, the resulting DateTime is earlier than the specified DateTime.

DateTimeKind.Unspecified返回Kind 的值的DateTime属性始终相等。The Kind property of the returned DateTime value always equals DateTimeKind.Unspecified. 可以通过调用Kind time 方法来保留参数的属性,如下面的DateTime.SpecifyKind示例所示。You can preserve the Kind property of the time parameter by calling the DateTime.SpecifyKind method, as the following example shows.

returnTime = DateTime.SpecifyKind(cal.AddYears(time, years), time.Kind);
returnTime = DateTime.SpecifyKind(cal.AddYears(time, years), time.Kind)

适用于

另请参阅