DateTimeOffset.Compare(DateTimeOffset, DateTimeOffset) Méthode

Définition

Compare deux objets DateTimeOffset et indique si le premier est antérieur, égal ou ultérieur au second.

public:
 static int Compare(DateTimeOffset first, DateTimeOffset second);
public static int Compare (DateTimeOffset first, DateTimeOffset second);
static member Compare : DateTimeOffset * DateTimeOffset -> int
Public Shared Function Compare (first As DateTimeOffset, second As DateTimeOffset) As Integer

Paramètres

first
DateTimeOffset

Premier objet à comparer.

second
DateTimeOffset

Deuxième objet à comparer.

Retours

Int32

Entier signé indiquant si la valeur du paramètre first est antérieure, ultérieure ou égale à la valeur du paramètre second, comme l'indique le tableau suivant.

Valeur retournée Signification
Inférieure à zéro first est antérieur à second.
Zéro first est égal à second.
Supérieure à zéro first est ultérieur à second.

Exemples

L’exemple suivant illustre les appels à la Compare méthode pour comparer DateTimeOffset des objets.

using System;

public class CompareTimes
{
   private enum TimeComparison
   {
      Earlier = -1,
      Same = 0,
      Later = 1
   };

   public static void Main()
   {
      DateTimeOffset firstTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                                 new TimeSpan(-7, 0, 0));

      DateTimeOffset secondTime = firstTime;
      Console.WriteLine("Comparing {0} and {1}: {2}",
                        firstTime, secondTime,
                        (TimeComparison) DateTimeOffset.Compare(firstTime, secondTime));

      secondTime = new DateTimeOffset(2007, 9, 1, 6, 45, 0,
                       new TimeSpan(-6, 0, 0));
      Console.WriteLine("Comparing {0} and {1}: {2}",
                       firstTime, secondTime,
                       (TimeComparison) DateTimeOffset.Compare(firstTime, secondTime));

      secondTime = new DateTimeOffset(2007, 9, 1, 8, 45, 0,
                       new TimeSpan(-5, 0, 0));
      Console.WriteLine("Comparing {0} and {1}: {2}",
                       firstTime, secondTime,
                       (TimeComparison) DateTimeOffset.Compare(firstTime, secondTime));
      // The example displays the following output to the console:
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
      //       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same
   }
}
open System

type TimeComparison =
    | Earlier = -1
    | Same = 0
    | Later = 1

let firstTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-7, 0, 0))

let secondTime = firstTime
printfn $"Comparing {firstTime} and {secondTime}: {DateTimeOffset.Compare(firstTime, secondTime) |> enum<TimeComparison>}"

let thirdTime = DateTimeOffset(2007, 9, 1, 6, 45, 0, TimeSpan(-6, 0, 0))
printfn $"Comparing {firstTime} and {thirdTime}: {DateTimeOffset.Compare(firstTime, thirdTime) |> enum<TimeComparison>}"

let fourthTime = DateTimeOffset(2007, 9, 1, 8, 45, 0, TimeSpan(-5, 0, 0))
printfn $"Comparing {firstTime} and {fourthTime}: {DateTimeOffset.Compare(firstTime, fourthTime) |> enum<TimeComparison>}"

// The example displays the following output to the console:
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
//       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same
Module CompareTimes
   Private Enum TimeComparison As Integer
      Earlier = -1
      Same = 0
      Later = 1
   End Enum
      
   Public Sub Main()
      Dim firstTime As New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                       New TimeSpan(-7, 0, 0))
  
      Dim secondTime As DateTimeOffset = firstTime
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                        firstTime, secondTime, _
                        CType(DateTimeOffset.Compare(firstTime, secondTime), _
                              TimeComparison))

      secondTime = New DateTimeOffset(#09/01/2007 6:45:00AM#, _
                       New TimeSpan(-6, 0, 0))      
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                       firstTime, secondTime, _
                       CType(DateTimeOffset.Compare(firstTime, secondTime), _
                             TimeComparison))
      
      secondTime = New DateTimeOffset(#09/01/2007 8:45:00AM#, _
                       New TimeSpan(-5, 0, 0))
      Console.WriteLine("Comparing {0} and {1}: {2}", _
                       firstTime, secondTime, _
                       CType(DateTimeOffset.Compare(firstTime, secondTime), _
                             TimeComparison))
      ' The example displays the following output to the console:
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -07:00: Same
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 6:45:00 AM -06:00: Later
      '       Comparing 9/1/2007 6:45:00 AM -07:00 and 9/1/2007 8:45:00 AM -05:00: Same      
   End Sub
End Module

Remarques

Lors de l’exécution de la comparaison, la méthode convertit à la fois les first paramètres en second temps universel coordonné (UTC) avant d’effectuer la comparaison. La méthode équivaut à ce qui suit :

return DateTime.Compare(first.UtcDateTime, second.UtcDateTime);
DateTime.Compare(first.UtcDateTime, second.UtcDateTime)
Return DateTime.Compare(first.UtcDateTime, second.UtcDateTime)

En d’autres termes, la Compare méthode détermine si deux DateTimeOffset objets représentent un point unique dans le temps. Il compare directement les dates et les heures ni les décalages.

S’applique à