DateTime.CompareTo Méthode

Source:

DateTime.cs

Source:

DateTime.cs

Source:

DateTime.cs

public:
 virtual int CompareTo(DateTime value);

public int CompareTo (DateTime value);

abstract member CompareTo : DateTime -> int
override this.CompareTo : DateTime -> int

Public Function CompareTo (value As DateTime) As Integer

Paramètres

Retours

Nombre signé indiquant les valeurs relatives de cette instance et du paramètre value.

Implémente

Exemples

L’exemple suivant instancie trois DateTime objets, un qui représente la date d’aujourd’hui, un autre qui représente la date d’un an auparavant et un troisième qui représente la date d’un an dans le futur. Il appelle ensuite la CompareTo(DateTime) méthode et affiche le résultat de la comparaison.

open System

type DateComparisonResult =
    | Earlier = -1
    | Later = 1
    | TheSame = 0

[<EntryPoint>]
let main _ =
    let thisDate = DateTime.Today

    // Define two DateTime objects for today's date next year and last year		
    // Call AddYears instance method to add/substract 1 year
    let thisDateNextYear = thisDate.AddYears 1
    let thisDateLastYear = thisDate.AddYears -1

    // Compare today to last year
    let comparison = thisDate.CompareTo thisDateLastYear |> enum<DateComparisonResult>
    printfn $"CompareTo method returns {int comparison}: {thisDate:d} is {comparison.ToString().ToLower()} than {thisDateLastYear:d}"

    // Compare today to next year
    let comparison = thisDate.CompareTo thisDateNextYear |> enum<DateComparisonResult>
    printfn $"CompareTo method returns {int comparison}: {thisDate:d} is {comparison.ToString().ToLower()} than {thisDateNextYear:d}"
                        
    0

// If run on December 31, 2021, the example produces the following output:
//    CompareTo method returns 1: 12/31/2021 is later than 12/31/2020
//    CompareTo method returns -1: 12/31/2021 is earlier than 12/31/2022

using System;

public class DateTimeComparison
{
   private enum DateComparisonResult
   {
      Earlier = -1,
      Later = 1,
      TheSame = 0
   };

   public static void Main()
   {
      DateTime thisDate = DateTime.Today;

      // Define two DateTime objects for today's date
      // next year and last year		
      DateTime thisDateNextYear, thisDateLastYear;

      // Call AddYears instance method to add/substract 1 year
      thisDateNextYear = thisDate.AddYears(1);
      thisDateLastYear = thisDate.AddYears(-1);

      // Compare dates
      //
      DateComparisonResult comparison;
      // Compare today to last year
      comparison = (DateComparisonResult) thisDate.CompareTo(thisDateLastYear);
      Console.WriteLine("CompareTo method returns {0}: {1:d} is {2} than {3:d}",
                        (int) comparison, thisDate, comparison.ToString().ToLower(),
                        thisDateLastYear);

      // Compare today to next year
      comparison = (DateComparisonResult) thisDate.CompareTo(thisDateNextYear);
      Console.WriteLine("CompareTo method returns {0}: {1:d} is {2} than {3:d}",
                        (int) comparison, thisDate, comparison.ToString().ToLower(),
                        thisDateNextYear);
   }
}
//
// If run on October 20, 2006, the example produces the following output:
//    CompareTo method returns 1: 10/20/2006 is later than 10/20/2005
//    CompareTo method returns -1: 10/20/2006 is earlier than 10/20/2007

Option Strict On

Module DateTimeComparison
   Private Enum DateComparisonResult
      Earlier = -1
      Later = 1
      TheSame = 0
   End Enum
   
   Public Sub Main()

      Dim thisDate As Date = Date.Today

      ' Define two DateTime objects for today's date 
      ' next year and last year		
      Dim thisDateNextYear, thisDateLastYear As Date

      ' Call AddYears instance method to add/substract 1 year
      thisDateNextYear = thisDate.AddYears(1)
      thisDateLastYear = thisDate.AddYears(-1)   

       
      ' Compare dates
      '
      Dim comparison As DateComparisonResult
      ' Compare today to last year
      comparison = CType(thisDate.CompareTo(thisDateLastYear), DateComparisonResult)
      Console.WriteLine("CompareTo method returns {0}: {1:d} is {2} than {3:d}", _ 
                        CInt(comparison), thisDate, comparison.ToString().ToLower(), _ 
                        thisDateLastYear)
      
      ' Compare today to next year
      comparison = CType(thisDate.CompareTo(thisDateNextYear), DateComparisonResult)
      Console.WriteLine("CompareTo method returns {0}: {1:d} is {2} than {3:d}", _
                        CInt(comparison), thisDate, comparison.ToString().ToLower(), _
                        thisDateNextYear)
   End Sub
End Module
'
' If run on October 20, 2006, the example produces the following output:
'    CompareTo method returns 1: 10/20/2006 is later than 10/20/2005
'    CompareTo method returns -1: 10/20/2006 is earlier than 10/20/2007

Remarques

Pour déterminer la relation de l’instance actuelle à value, la CompareTo méthode compare la Ticks propriété de l’instance actuelle et value ignore sa Kind propriété. Avant de comparer des DateTime objets, assurez-vous que les objets représentent des heures dans le même fuseau horaire. Pour ce faire, comparez les valeurs de leurs Kind propriétés.

Cette méthode implémente l’interface System.IComparable<T> et fonctionne légèrement mieux que la surcharge de méthode DateTime.CompareTo(Object) , car elle n’a pas besoin de convertir le value paramètre en objet.

Voir aussi

• Compare(DateTime, DateTime)
• Equals(Object)

Source:

DateTime.cs

Source:

DateTime.cs

Source:

DateTime.cs

public:
 virtual int CompareTo(System::Object ^ value);

public:
 int CompareTo(System::Object ^ value);

public int CompareTo (object? value);

public int CompareTo (object value);

abstract member CompareTo : obj -> int
override this.CompareTo : obj -> int

member this.CompareTo : obj -> int

Public Function CompareTo (value As Object) As Integer

Paramètres

Retours

Nombre signé indiquant les valeurs relatives de cette instance et value.

Implémente

Exceptions

Exemples

L’exemple suivant illustre la CompareTo méthode.

using namespace System;
void main()
{
   

   System::DateTime theDay(System::DateTime::Today.Year,7,28);
   int compareValue;
   try
   {
      compareValue = theDay.CompareTo( System::DateTime::Today );
   }
   catch ( ArgumentException^ ) 
   {
      System::Console::WriteLine( "Value is not a DateTime" );
      return;
   }

   if ( compareValue < 0 )
   {
      System::Console::WriteLine( "{0:d} is in the past.", theDay );
   }
   else
   if ( compareValue == 0 )
   {
      System::Console::WriteLine( "{0:d} is today!", theDay );
   }
   else
   // compareValue > 0 
   {
      System::Console::WriteLine( "{0:d} has not come yet.", theDay );
   }
}

open System

let theDay = DateTime(DateTime.Today.Year, 7, 28)

try
    let compareValue = theDay.CompareTo DateTime.Today

    if compareValue < 0 then
        printfn $"{theDay:d} is in the past."
    elif compareValue = 0 then
        printfn $"{theDay:d} is today!"
    else // compareValue > 0
        printfn $"{theDay:d} has not come yet."
        
with :? ArgumentException ->
    Console.WriteLine("Value is not a DateTime");

System.DateTime theDay = new System.DateTime(System.DateTime.Today.Year, 7, 28);
int compareValue;

try
{
    compareValue = theDay.CompareTo(DateTime.Today);
}
catch (ArgumentException)
{
   Console.WriteLine("Value is not a DateTime");
   return;
}

if (compareValue < 0)
   System.Console.WriteLine("{0:d} is in the past.", theDay);
else if (compareValue == 0)
   System.Console.WriteLine("{0:d} is today!", theDay);
else // compareValue > 0
   System.Console.WriteLine("{0:d} has not come yet.", theDay);

Dim thDay As New System.DateTime(System.DateTime.Today.Year, 7, 28)

Dim compareValue As Integer
Try
   compareValue = thDay.CompareTo(System.DateTime.Today)
Catch exp As ArgumentException
   System.Console.WriteLine("Value is not a DateTime")
End Try

If compareValue < 0 Then
   System.Console.WriteLine("{0:d} is in the past.", thDay)
ElseIf compareValue = 0 Then
   System.Console.WriteLine("{0:d} is today!", thDay)
Else   ' compareValue >= 1 
   System.Console.WriteLine("{0:d} has not come yet.", thDay)
End If

Remarques

Pour déterminer la relation de l’instance actuelle à value, la CompareTo méthode compare la Ticks propriété de l’instance actuelle et value ignore sa Kind propriété. Avant de comparer des DateTime objets, assurez-vous que les objets représentent des heures dans le même fuseau horaire. Pour ce faire, comparez les valeurs de leurs Kind propriétés.

Toute instance de DateTime, quelle que soit sa valeur, est considérée comme supérieure à null.

Voir aussi

• Compare(DateTime, DateTime)
• Equals(Object)