DateTime.CompareTo メソッドとは？ わかりやすく解説

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DateTime.CompareTo メソッド (DateTime)

メモ : このメソッドは、.NET Framework version 2.0 で新しく追加されたものです。

指定した DateTime オブジェクトとこのインスタンスを比較し、これらの相対値を示す値を返します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Function CompareTo ( _
    value As DateTime _
) As Integer
Visual Basic (使用法)
Dim instance As DateTime
Dim value As DateTime
Dim returnValue As Integer

returnValue = instance.CompareTo(value)
C#
public int CompareTo (
    DateTime value
)
C++
public:
virtual int CompareTo (
    DateTime value
) sealed
J#
public final int CompareTo (
    DateTime value
)
JScript
public final function CompareTo (
    value : DateTime
) : int

パラメータ

value

比較対象の DateTime オブジェクト。

戻り値
このインスタンスと value パラメータの相対値を示す符号付き数値。

値

説明

0 より小さい値

このインスタンスは、value よりも小さくなっています。

0

このインスタンスは value と等価です。

0 より大きい値

このインスタンスは value よりも大きくなっています。

解説解説

このメソッドは、System.IComparable インターフェイスを実装し、value パラメータをオブジェクトに変換する必要がないため、DateTime.CompareTo メソッドと比べ、若干パフォーマンスが向上しています。

DateTime オブジェクト間の比較を行う場合は、あらかじめ両方のオブジェクトが同じタイム ゾーンの時刻を表すことを確認してください。

使用例使用例

いくつかの値型および参照型について、ジェネリック バージョンと非ジェネリック バージョンの CompareTo メソッドのコード例を次に示します。

Visual Basic
' This example demonstrates the generic and non-generic versions of
 the 
' CompareTo method for several base types.
' The non-generic version takes a parameter of type Object, while the
 generic
' version takes a type-specific parameter, such as Boolean, Int32, or
 Double.

Imports System

Class Sample
   Public Shared Sub Main()
      Dim nl As String =
 Environment.NewLine
      Dim msg As String
 = _
          "{0}The following is the result of using the generic
 and non-generic{0}" & _
          "versions of the CompareTo method for several base types:{0}"
      
      Dim now As DateTime = DateTime.Now
      ' Time span = 11 days, 22 hours, 33 minutes, 44 seconds
      Dim tsX As New TimeSpan(11,
 22, 33, 44)
      ' Version = 1.2.333.4
      Dim versX As New Version("1.2.333.4")
      ' Guid = CA761232-ED42-11CE-BACD-00AA0057B223
      Dim guidX As New Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}")
      
      Dim a1 As [Boolean] = True,
    a2 As [Boolean] = True
      Dim b1 As [Byte] = 1,          b2 As
 [Byte] = 1
      Dim c1 As Int16 = -2,          c2 As
 Int16 = 2
      Dim d1 As Int32 = 3,           d2 As
 Int32 = 3
      Dim e1 As Int64 = 4,           e2 As
 Int64 = -4
      Dim f1 As [Decimal] = -5.5D,   f2 As
 [Decimal] = 5.5D
      Dim g1 As [Single] = 6.6F,     g2 As
 [Single] = 6.6F
      Dim h1 As [Double] = 7.7,      h2 As
 [Double] = -7.7
      Dim i1 As [Char] = "A"c,
       i2 As [Char] = "A"c
      Dim j1 As String =
 "abc",      j2 As String
 = "abc"
      Dim k1 As DateTime = now,      k2 As
 DateTime = now
      Dim l1 As TimeSpan = tsX,      l2 As
 TimeSpan = tsX
      Dim m1 As Version = versX,     m2 As
 New Version("2.0")
      Dim n1 As Guid = guidX,        n2 As
 Guid = guidX
      
      ' The following types are not CLS-compliant.
      ' SByte, UInt16, UInt32, UInt64

      Console.WriteLine(msg, nl)
      Try
         ' The second and third Show method call parameters are automatically
 boxed because
         ' the second and third Show method declaration arguments expect
 type Object.

         Show("Boolean:  ", a1, a2, a1.CompareTo(a2),
 a1.CompareTo(CObj(a2)))
         Show("Byte:     ", b1, b2, b1.CompareTo(b2),
 b1.CompareTo(CObj(b2)))
         Show("Int16:    ", c1, c2, c1.CompareTo(c2),
 c1.CompareTo(CObj(c2)))
         Show("Int32:    ", d1, d2, d1.CompareTo(d2),
 d1.CompareTo(CObj(d2)))
         Show("Int64:    ", e1, e2, e1.CompareTo(e2),
 e1.CompareTo(CObj(e2)))
         Show("Decimal:  ", f1, f2, f1.CompareTo(f2),
 f1.CompareTo(CObj(f2)))
         Show("Single:   ", g1, g2, g1.CompareTo(g2),
 g1.CompareTo(CObj(g2)))
         Show("Double:   ", h1, h2, h1.CompareTo(h2),
 h1.CompareTo(CObj(h2)))
         Show("Char:     ", i1, i2, i1.CompareTo(i2),
 i1.CompareTo(CObj(i2)))
         Show("String:   ", j1, j2, j1.CompareTo(j2),
 j1.CompareTo(CObj(j2)))
         Show("DateTime: ", k1, k2, k1.CompareTo(k2),
 k1.CompareTo(CObj(k2)))
         Show("TimeSpan: ", l1, l2, l1.CompareTo(l2),
 l1.CompareTo(CObj(l2)))
         Show("Version:  ", m1, m2, m1.CompareTo(m2),
 m1.CompareTo(CObj(m2)))
         Show("Guid:     ", n1, n2, n1.CompareTo(n2),
 n1.CompareTo(CObj(n2)))
         '
         Console.WriteLine("{0}The following types are not CLS-compliant:",
 nl)
         Console.WriteLine("SByte, UInt16, UInt32, UInt64")

      Catch e As Exception
         Console.WriteLine(e)
      End Try
   End Sub 'Main
   
   Public Shared Sub Show(caption
 As String, var1 As [Object],
 var2 As [Object], _
                          resultGeneric As Integer,
 resultNonGeneric As Integer)
      Dim relation As String
      
      Console.Write(caption)
      If resultGeneric = resultNonGeneric Then
         If resultGeneric < 0 Then
            relation = "less than"
         ElseIf resultGeneric > 0 Then
            relation = "greater than"
         Else
            relation = "equal to"
         End If
         Console.WriteLine("{0} is {1} {2}", var1,
 relation, var2)
      
      ' The following condition will never occur because the generic
 and non-generic
      ' CompareTo methods are equivalent.

      Else
         Console.WriteLine("Generic CompareTo = {0}; non-generic
 CompareTo = {1}", _
                            resultGeneric, resultNonGeneric)
      End If
   End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'The following is the result of using the generic and non-generic versions
 of the
'CompareTo method for several base types:
'
'Boolean:  True is equal to True
'Byte:     1 is equal to 1
'Int16:    -2 is less than 2
'Int32:    3 is equal to 3
'Int64:    4 is greater than -4
'Decimal:  -5.5 is less than 5.5
'Single:   6.6 is equal to 6.6
'Double:   7.7 is greater than -7.7
'Char:     A is equal to A
'String:   abc is equal to abc
'DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
'TimeSpan: 11.22:33:44 is equal to 11.22:33:44
'Version:  1.2.333.4 is less than 2.0
'Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
'aa0057b223
'
'The following types are not CLS-compliant:
'SByte, UInt16, UInt32, UInt64
'
C#
// This example demonstrates the generic and non-generic versions of
 the 
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the
 generic
// version takes a type-specific parameter, such as Boolean, Int32,
 or Double.

using System;

class Sample 
{
    public static void Main()
 
    {
    string    nl = Environment.NewLine;
    string    msg = "{0}The following is the result of using
 the generic and non-generic{0}" +
                    "versions of the CompareTo method for
 several base types:{0}";

    DateTime  now = DateTime.Now;
// Time span = 11 days, 22 hours, 33 minutes, 44 seconds
    TimeSpan  tsX = new TimeSpan(11, 22, 33, 44); 
// Version = 1.2.333.4
    Version   versX = new Version("1.2.333.4");  
// Guid = CA761232-ED42-11CE-BACD-00AA0057B223
    Guid      guidX = new Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}");

    Boolean  a1 = true,  a2 = true;
    Byte     b1 = 1,     b2 = 1;
    Int16    c1 = -2,    c2 = 2;
    Int32    d1 = 3,     d2 = 3;
    Int64    e1 = 4,     e2 = -4;
    Decimal  f1 = -5.5m, f2 = 5.5m;
    Single   g1 = 6.6f,  g2 = 6.6f;
    Double   h1 = 7.7d,  h2 = -7.7d;
    Char     i1 = 'A',   i2 = 'A';
    String   j1 = "abc", j2 = "abc";
    DateTime k1 = now,   k2 = now;
    TimeSpan l1 = tsX,   l2 = tsX;
    Version  m1 = versX, m2 = new Version("2.0");
    Guid     n1 = guidX, n2 = guidX;

// The following types are not CLS-compliant.
    SByte    w1 = 8,     w2 = 8;
    UInt16   x1 = 9,     x2 = 9;
    UInt32   y1 = 10,    y2 = 10;
    UInt64   z1 = 11,    z2 = 11;
//
    Console.WriteLine(msg, nl);
    try 
        {
// The second and third Show method call parameters are automatically
 boxed because
// the second and third Show method declaration arguments expect type
 Object.

        Show("Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo((Object)a2));
        Show("Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo((Object)b2));
        Show("Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo((Object)c2));
        Show("Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo((Object)d2));
        Show("Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo((Object)e2));
        Show("Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo((Object)f2));
        Show("Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo((Object)g2));
        Show("Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo((Object)h2));
        Show("Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo((Object)i2));
        Show("String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo((Object)j2));
        Show("DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo((Object)k2));
        Show("TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo((Object)l2));
        Show("Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo((Object)m2));
        Show("Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo((Object)n2));
//
        Console.WriteLine("{0}The following types are not CLS-compliant:",
 nl);
        Show("SByte:    ", w1, w2, w1.CompareTo(w2), w1.CompareTo((Object)w2));
        Show("UInt16:   ", x1, x2, x1.CompareTo(x2), x1.CompareTo((Object)x2));
        Show("UInt32:   ", y1, y2, y1.CompareTo(y2), y1.CompareTo((Object)y2));
        Show("UInt64:   ", z1, z2, z1.CompareTo(z2), z1.CompareTo((Object)z2));
        }
    catch (Exception e)
        {
        Console.WriteLine(e);
        }
    }

    public static void Show(string
 caption, Object var1, Object var2, 
                            int resultGeneric, int
 resultNonGeneric)
    {
    string relation;

    Console.Write(caption);
    if (resultGeneric == resultNonGeneric) 
        {
        if      (resultGeneric < 0) relation = "less than";
        else if (resultGeneric > 0) relation
 = "greater than";
        else                        relation = "equal to";
        Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
        }

// The following condition will never occur because the generic and
 non-generic
// CompareTo methods are equivalent.

    else
        {
        Console.WriteLine("Generic CompareTo = {0}; non-generic CompareTo =
 {1}", 
                           resultGeneric, resultNonGeneric);
        }
   }
}
/*
This example produces the following results:

The following is the result of using the generic and non-generic
 versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/
C++
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the
 generic
// version takes a type-specific parameter, such as Boolean, Int32,
 or Double.
using namespace System;
void Show( String^ caption, Object^ var1, Object^ var2, int
 resultGeneric, int resultNonGeneric )
{
   String^ relation;
   Console::Write( caption );
   if ( resultGeneric == resultNonGeneric )
   {
      if ( resultGeneric < 0 )
            relation = "less than";
      else
      if ( resultGeneric > 0 )
            relation = "greater than";
      else
            relation = "equal to";
      Console::WriteLine( "{0} is {1} {2}", var1, relation, var2 );
   }
   // The following condition will never occur because the generic and
 non-generic
   // CompareTo methods are equivalent.
   else
   {
      Console::WriteLine( "Generic CompareTo = {0}; non-generic CompareTo =
 {1}", resultGeneric, resultNonGeneric );
   }
}

int main()
{
   String^ nl = Environment::NewLine;
   String^ msg = "{0}The following is the result of using
 the generic and non-generic{0}"
   "versions of the CompareTo method for several base
 types:{0}";
   Object^ obj; // An Object used to insure CompareTo(Object) is called.

   DateTime now = DateTime::Now;
   
   // Time span = 11 days, 22 hours, 33 minutes, 44 seconds
   TimeSpan tsX = TimeSpan(11,22,33,44);
   
   // Version = 1.2.333.4
   Version^ versX = gcnew Version(  "1.2.333.4" );
   
   // Guid = CA761232-ED42-11CE-BACD-00AA0057B223
   Guid guidX = Guid( "{CA761232-ED42-11CE-BACD-00AA0057B223}");
   Boolean a1 = true,a2 = true;
   Byte b1 = 1,b2 = 1;
   Int16 c1 = -2,c2 = 2;
   Int32 d1 = 3,d2 = 3;
   Int64 e1 = 4,e2 = -4;
   Decimal f1 = Decimal(-5.5), f2 = Decimal(5.5);
   Single g1 = 6.6f,g2 = 6.6f;
   Double h1 = 7.7,h2 = -7.7;
   Char i1 = 'A',i2 = 'A';
   String^ j1 = "abc", ^j2 = "abc";
   DateTime k1 = now,k2 = now;
   TimeSpan l1 = tsX,l2 = tsX;
   Version^ m1 = versX, ^m2 = gcnew Version(  "2.0" );
   Guid n1 = guidX,n2 = guidX;
   
   // The following types are not CLS-compliant.
   SByte w1 = 8,w2 = 8;
   UInt16 x1 = 9,x2 = 9;
   UInt32 y1 = 10,y2 = 10;
   UInt64 z1 = 11,z2 = 11;
   
   //
   Console::WriteLine( msg, nl );
   try
   {
      Show( "Boolean: ", a1, a2, a1.CompareTo( a2 ), a1.CompareTo( a2 )
 );
      Show( "Byte:    ", b1, b2, b1.CompareTo( b2 ), b1.CompareTo( b2 )
 );
      Show( "Int16:   ", c1, c2, c1.CompareTo( c2 ), c1.CompareTo( c2 )
 );
      Show( "Int32:   ", d1, d2, d1.CompareTo( d2 ), d1.CompareTo( d2 )
 );
      Show( "Int64:   ", e1, e2, e1.CompareTo( e2 ), e1.CompareTo( e2 )
 );
      Show( "Decimal: ", f1, f2, f1.CompareTo( f2 ), f1.CompareTo( f2 )
 );
      Show( "Single:  ", g1, g2, g1.CompareTo( g2 ), g1.CompareTo( g2 )
 );
      Show( "Double:  ", h1, h2, h1.CompareTo( h2 ), h1.CompareTo( h2 )
 );
      Show( "Char:    ", i1, i2, i1.CompareTo( i2 ), i1.CompareTo( i2 )
 );
      
      // Use an anonymous object to hide the String object.
      obj = j2;
      Show( "String:  ", j1, j2, j1->CompareTo( j2 ), j1->CompareTo(
 obj ) );
      Show( "DateTime:", k1, k2, k1.CompareTo( k2 ), k1.CompareTo( k2 )
 );
      Show(  "TimeSpan: ", l1, l2, l1.CompareTo( l2 ), l1.CompareTo( l2
 ) );
      
      // Use an anonymous object to hide the Version object.
      obj = m2;
      Show(  "Version:  ", m1, m2, m1->CompareTo( m2 ), m1->CompareTo(
 obj ) );
      Show(  "Guid:     ", n1, n2, n1.CompareTo( n2 ), n1.CompareTo( n2
 ) );
      
      //
      Console::WriteLine( "{0}The following types are not CLS-compliant:",
 nl );
      Show( "SByte:   ", w1, w2, w1.CompareTo( w2 ), w1.CompareTo( w2 )
 );
      Show( "UInt16:  ", x1, x2, x1.CompareTo( x2 ), x1.CompareTo( x2 )
 );
      Show( "UInt32:  ", y1, y2, y1.CompareTo( y2 ), y1.CompareTo( y2 )
 );
      Show( "UInt64:  ", z1, z2, z1.CompareTo( z2 ), z1.CompareTo( z2 )
 );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e );
   }

}

/*
This example produces the following results:

The following is the result of using the generic and non-generic
 versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/
J#
// This example demonstrates the generic and non-generic versions of
 the 
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the
 generic
// version takes a type-specific parameter, such as Boolean, Int32,
 or Double.

import System.*;

class Sample
{
    public static void main(String[]
 args)
    {
        String nl = Environment.get_NewLine();
        String msg = "{0}The following is the result of using
 the generic and"
            +" non-generic{0}versions of the CompareTo method for"
            +" several base types:{0}";

        DateTime now = DateTime.get_Now();

        // Time span = 11 days, 22 hours, 33 minutes, 44 seconds
        TimeSpan tsX = new TimeSpan(11, 22, 33, 44);

        // Version = 1.2.333.4
        Version versX = new Version("1.2.333.4");

        // Guid = CA761232-ED42-11CE-BACD-00AA0057B223
        Guid guidX = new Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}");

        System.Boolean a1 = true,a2 = true;
        System.Byte b1 = (System.Byte)1,b2 =(System.Byte)1;
        Int16 c1 = (System.Int16)(-2),c2 = (System.Int16)2;
        Int32 d1 = (System.Int32)3,d2 = (System.Int32)3;
        Int64 e1 = (System.Int64)4,e2 = (System.Int64)(-4);
        Decimal f1 = new Decimal(-5.5),f2 = new
 Decimal(5.5);
        Single g1 = (System.Single)6.6,g2 = (System.Single)6.6;
        System.Double h1 = (System.Double)7.7,h2 = (System.Double)(-7.7);
        System.Char i1 = (System.Char)'A',i2 = (System.Char)'A';;
        String j1 = "abc", j2 = "abc";
        DateTime k1 = now, k2 = now;
        TimeSpan l1 = tsX, l2 = tsX;
        Version m1 = versX, m2 = new Version("2.0");
        Guid n1 = guidX, n2 = guidX;

        // The following types are not CLS-compliant.
        SByte w1 = (System.SByte)8,w2 = (System.SByte)8;
        UInt16 x1 = (System.UInt16)9,x2 = (System.UInt16)9;
        UInt32 y1 = (System.UInt32)10,y2 = (System.UInt32)10;
        UInt64 z1 = (System.UInt64)11,z2 = (System.UInt64)11;
        //
        Console.WriteLine(msg, nl);
        try {
            // The second and third Show method call parameters are
            // automatically boxed because the second and third Show
 method
            // declaration arguments expect type Object.
            Show("Boolean:  ", a1, a2, a1.CompareTo(a2),
                a1.CompareTo((Object)a2));
            Show("Byte:     ", b1, b2, b1.CompareTo(b2),
                b1.CompareTo((Object)b2));
            Show("Int16:    ", c1, c2, c1.CompareTo(c2), 
                c1.CompareTo((Object)c2));
            Show("Int32:    ", d1, d2, d1.CompareTo(d2),
                d1.CompareTo((Object)d2));
            Show("Int64:    ", e1, e2, e1.CompareTo(e2),
                e1.CompareTo(((Object)e2)));
            Show("Decimal:  ", f1, f2, f1.CompareTo(f2),
                f1.CompareTo((Object)f2));
            Show("Single:   ", g1, g2, g1.CompareTo(g2),
                g1.CompareTo((Object)g2));
            Show("Double:   ", h1, h2, h1.CompareTo(h2),
                h1.CompareTo((Object)h2));
            Show("Char:     ", i1, i2, i1.CompareTo(i2), 
                i1.CompareTo(((Object)i2)));
            Show("String:   ", j1, j2, j1.CompareTo(j2),
                j1.CompareTo((Object)j2));
            Show("DateTime: ", k1, k2, k1.CompareTo(k2),
                k1.CompareTo((Object)(k2)));
            Show("TimeSpan: ", l1, l2, l1.CompareTo(l2),
                l1.CompareTo((Object)l2));
            Show("Version:  ", m1, m2, m1.CompareTo(m2), 
                m1.CompareTo((Object)m2));
            Show("Guid:     ", n1, n2, n1.CompareTo(n2), 
                n1.CompareTo((Object)n2));
            //
            Console.WriteLine(
                "{0}The following types are not CLS-compliant:", nl);
            Show("SByte:    ", w1, w2, w1.CompareTo(w2),
                w1.CompareTo((Object)w2));
            Show("UInt16:   ", x1, x2, x1.CompareTo(x2), 
                x1.CompareTo((Object)x2));
            Show("UInt32:   ", y1, y2, y1.CompareTo(y2),
                y1.CompareTo((Object)y2));
            Show("UInt64:   ", z1, z2, z1.CompareTo(z2),
                z1.CompareTo((Object)z2));
        }
        catch (System.Exception e) {
            Console.WriteLine(e);
        }
    } //main

    public static void Show(String
 caption, Object var1, Object var2,
        int resultGeneric, int resultNonGeneric)
    {
        String relation;

        Console.Write(caption);
        if (resultGeneric == resultNonGeneric) {
            if (resultGeneric < 0) {
                relation = "less than";
            }
            else {
                if (resultGeneric > 0) {
                    relation = "greater than";
                }
                else {
                    relation = "equal to";
                }
            }
            Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
        }
        // The following condition will never occur because the generic
 and 
        // non-generic CompareTo methods are equivalent.
        else {
            Console.WriteLine("Generic CompareTo = {0};"
                +" non-generic CompareTo = {1}",
                System.Convert.ToString(resultGeneric),
                System.Convert.ToString(resultNonGeneric));
        }
    } //Show
} //Sample
/*
This example produces the following results:

The following is the result of using the generic and non-generic
 versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42
-11ce-bacd-00aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0
.NET Compact Framework
サポート対象 : 2.0
参照参照
関連項目
DateTime 構造体
DateTime メンバ
System 名前空間
Compare
Equals

DateTime.CompareTo メソッド

指定したオブジェクトまたは値型とこのインスタンスとを比較し、これらの相対値を示す値を返します。
オーバーロードの一覧オーバーロードの一覧

名前 説明
DateTime.CompareTo (DateTime) 指定した DateTime オブジェクトとこのインスタンスを比較し、これらの相対値を示す値を返します。

.NET Compact Framework によってサポートされています。

DateTime.CompareTo (Object) 指定したオブジェクトとこのインスタンスを比較し、これらの相対値を示す値を返します。

.NET Compact Framework によってサポートされています。

参照参照

関連項目

DateTime 構造体
DateTime メンバ
System 名前空間
Compare
Equals

DateTime.CompareTo メソッド (Object)

指定したオブジェクトとこのインスタンスを比較し、これらの相対値を示す値を返します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Function CompareTo ( _
    value As Object _
) As Integer
Visual Basic (使用法)
Dim instance As DateTime
Dim value As Object
Dim returnValue As Integer

returnValue = instance.CompareTo(value)
C#
public int CompareTo (
    Object value
)
C++
public:
virtual int CompareTo (
    Object^ value
) sealed
J#
public final int CompareTo (
    Object value
)
JScript
public final function CompareTo (
    value : Object
) : int

パラメータ

value

比較対象のボックス化された DateTime オブジェクトまたは null 参照 (Visual Basic では Nothing)。

戻り値
このインスタンスと value の相対値を示す符号付き数値。

値

説明

0 より小さい値

このインスタンスは、value よりも小さくなっています。

0

このインスタンスは value と等価です。

0 より大きい値

このインスタンスは value より大きいか、または value が null 参照 (Visual Basic では Nothing) です。

例外例外
例外の種類条件

ArgumentException

value が DateTime ではありません。

解説解説

DateTime オブジェクト間の比較を行う場合は、あらかじめ両方のオブジェクトが同じタイム ゾーンの時刻を表すことを確認してください。

DateTime のすべてのインスタンスは、その値に関係なく、null 参照 (Visual Basic では Nothing) より大きいと見なされます。

使用例使用例

CompareTo メソッドのコード例を次に示します。

Visual Basic
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)
ElseIf compareValue = 1 Then
   System.Console.WriteLine("Value is null")
Else ' compareValue > 0 && compareValue
 != 1
   System.Console.WriteLine("{0:d} has not come yet.",
 thDay)
End If
C#
System.DateTime theDay = 
          new System.DateTime(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 if (compareValue == 1) {
    System.Console.WriteLine("Value is null");
}
// compareValue > 0 && compareValue != 1
else { 
    System.Console.WriteLine("{0:d} has not come yet.", theDay);
}
C++
   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
   if ( compareValue == 1 )
   {
      System::Console::WriteLine( "Value is 0" );
   }
   // compareValue > 0 && compareValue != 1
   else
   {
      System::Console::WriteLine( "{0:d} has not come yet.", theDay );
   }
}
J#
System.DateTime theDay = new System.DateTime(System.DateTime.
    get_Today().get_Year(), 7, 28);
int compareValue;
try {
    compareValue = theDay.CompareTo(System.DateTime.get_Today());
}
catch (ArgumentException exp) {
    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 {
        if (compareValue == 1) {
            System.Console.WriteLine("Value is null");
        }
        // compareValue > 0 && compareValue != 1
        else {
            System.Console.WriteLine("{0:d} has not come yet.", 
                theDay);
        }
    } 
}
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0
参照参照
関連項目
DateTime 構造体
DateTime メンバ
System 名前空間
Compare
Equals

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