DateTime.Equals 方法

定義

命名空間:

System

組件:

System.Runtime.dll

傳回值，指出兩個 DateTime 物件，或 DateTime 執行個體和另一個物件或 DateTime 是否有相同的值。

多載

Equals(DateTime)	傳回值，該值指出這個執行個體的值是否等於指定之 DateTime 執行個體的值。
Equals(Object)	傳回值，該值表示這個執行個體是否和指定的物件相等。
Equals(DateTime, DateTime)	傳回值，指出兩 DateTime 個實例是否有相同的日期和時間值。

Equals(DateTime)

來源:

DateTime.cs

傳回值，該值指出這個執行個體的值是否等於指定之 DateTime 執行個體的值。

public:
 virtual bool Equals(DateTime value);

public bool Equals (DateTime value);

override this.Equals : DateTime -> bool

Public Function Equals (value As DateTime) As Boolean

參數

value

DateTime

與這個執行個體相比較的物件。

傳回

Boolean

當 true 參數等於這個執行個體的值時為 value，否則為 false。

實作

Equals(T)

範例

下列範例示範 Equals 方法。

using System;

public class Application
{
    public static void Main()
    {
        // Create some DateTime objects.
        DateTime one = DateTime.UtcNow;

        DateTime two = DateTime.Now;

        DateTime three = one;

        // Compare the DateTime objects and display the results.
        bool result = one.Equals(two);

        Console.WriteLine("The result of comparing DateTime object one and two is: {0}.", result);

        result = one.Equals(three);

        Console.WriteLine("The result of comparing DateTime object one and three is: {0}.", result);
    }
}

// This code example displays the following:
//
// The result of comparing DateTime object one and two is: False.
// The result of comparing DateTime object one and three is: True.

open System

// Create some DateTime objects.
let one = DateTime.UtcNow

let two = DateTime.Now

let three = one

// Compare the DateTime objects and display the results.
let result = one.Equals two

printfn $"The result of comparing DateTime object one and two is: {result}."

let result2 = one.Equals three

printfn $"The result of comparing DateTime object one and three is: {result2}."

// This code example displays the following:
//
// The result of comparing DateTime object one and two is: False.
// The result of comparing DateTime object one and three is: True.

Module Application

    Sub Main()
        ' Create some DateTime objects.
        Dim one As DateTime = DateTime.UtcNow

        Dim two As DateTime = DateTime.Now

        Dim three As DateTime = one

        ' Compare the DateTime objects and display the results.
        Dim result As Boolean = one.Equals(two)

        Console.WriteLine("The result of comparing DateTime object one and two is: {0}.", result)

        result = one.Equals(three)

        Console.WriteLine("The result of comparing DateTime object one and three is: {0}.", result)

    End Sub
End Module

' This code example displays the following:
'
' The result of comparing DateTime object one and two is: False.
' The result of comparing DateTime object one and three is: True.

備註

目前的 實例，如果其 Ticks 屬性值相等，則 value 為相等。 其 Kind 屬性值不會在測試中考慮是否相等。

這個方法會實作 System.IEquatable<T> 介面，並執行比 方法稍微好 Equals 一點，因為 value 參數不需要轉換成 物件。

另請參閱

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

Equals(Object)

來源:

DateTime.cs

傳回值，該值表示這個執行個體是否和指定的物件相等。

public:
 override bool Equals(System::Object ^ value);

public override bool Equals (object? value);

override this.Equals : obj -> bool

Public Overrides Function Equals (value As Object) As Boolean

參數

value

Object

與這個執行個體相比較的物件。

傳回

Boolean

如果 value 是 DateTime 的執行個體，並且等於這個執行個體的值，則為 true，否則為 false。

範例

下列範例示範 Equals 方法。

using System;

public class Application
{
    public static void Main()
    {
        // Create some DateTime objects.
        DateTime one = DateTime.UtcNow;

        DateTime two = DateTime.Now;

        DateTime three = one;

        // Compare the DateTime objects and display the results.
        bool result = one.Equals(two);

        Console.WriteLine("The result of comparing DateTime object one and two is: {0}.", result);

        result = one.Equals(three);

        Console.WriteLine("The result of comparing DateTime object one and three is: {0}.", result);
    }
}

// This code example displays the following:
//
// The result of comparing DateTime object one and two is: False.
// The result of comparing DateTime object one and three is: True.

open System

// Create some DateTime objects.
let one = DateTime.UtcNow

let two = DateTime.Now

let three = one

// Compare the DateTime objects and display the results.
let result = one.Equals two

printfn $"The result of comparing DateTime object one and two is: {result}."

let result2 = one.Equals three

printfn $"The result of comparing DateTime object one and three is: {result2}."

// This code example displays the following:
//
// The result of comparing DateTime object one and two is: False.
// The result of comparing DateTime object one and three is: True.

Module Application

    Sub Main()
        ' Create some DateTime objects.
        Dim one As DateTime = DateTime.UtcNow

        Dim two As DateTime = DateTime.Now

        Dim three As DateTime = one

        ' Compare the DateTime objects and display the results.
        Dim result As Boolean = one.Equals(two)

        Console.WriteLine("The result of comparing DateTime object one and two is: {0}.", result)

        result = one.Equals(three)

        Console.WriteLine("The result of comparing DateTime object one and three is: {0}.", result)

    End Sub
End Module

' This code example displays the following:
'
' The result of comparing DateTime object one and two is: False.
' The result of comparing DateTime object one and three is: True.

備註

目前的 實例，如果其 Ticks 屬性值相等，則 value 為相等。 其 Kind 屬性值不會在測試中考慮是否相等。

另請參閱

• Compare(DateTime, DateTime)
• CompareTo(Object)

Equals(DateTime, DateTime)

來源:

DateTime.cs

傳回值，指出兩 DateTime 個實例是否有相同的日期和時間值。

public:
 static bool Equals(DateTime t1, DateTime t2);

public static bool Equals (DateTime t1, DateTime t2);

static member Equals : DateTime * DateTime -> bool

Public Shared Function Equals (t1 As DateTime, t2 As DateTime) As Boolean

參數

t1

DateTime

要比較的第一個物件。

t2

DateTime

要比較的第二個物件。

傳回

Boolean

當兩個值相等時為 true，否則為 false。

範例

下列範例示範 Equals 方法。

System::DateTime today1 = System::DateTime(
   System::DateTime::Today.Ticks );
System::DateTime today2 = System::DateTime(
   System::DateTime::Today.Ticks );
System::DateTime tomorrow = System::DateTime(
   System::DateTime::Today.AddDays( 1 ).Ticks );

// todayEqualsToday gets true.
bool todayEqualsToday = System::DateTime::Equals( today1, today2 );

// todayEqualsTomorrow gets false.
bool todayEqualsTomorrow = System::DateTime::Equals( today1, tomorrow );

let today1 = 
    System.DateTime System.DateTime.Today.Ticks

let today2 =
    System.DateTime System.DateTime.Today.Ticks

let tomorrow =
    System.DateTime.Today.AddDays(1).Ticks
    |> System.DateTime 

// todayEqualsToday gets true.
let todayEqualsToday = System.DateTime.Equals(today1, today2)

// todayEqualsTomorrow gets false.
let todayEqualsTomorrow = System.DateTime.Equals(today1, tomorrow)

System.DateTime today1 =
        new System.DateTime(System.DateTime.Today.Ticks);
System.DateTime today2 =
        new System.DateTime(System.DateTime.Today.Ticks);
System.DateTime tomorrow =
        new System.DateTime(
                    System.DateTime.Today.AddDays(1).Ticks);

// todayEqualsToday gets true.
bool todayEqualsToday = System.DateTime.Equals(today1, today2);

// todayEqualsTomorrow gets false.
bool todayEqualsTomorrow = System.DateTime.Equals(today1, tomorrow);

Dim today1 As New System.DateTime(System.DateTime.Today.Ticks)
Dim today2 As New System.DateTime(System.DateTime.Today.Ticks)
Dim tomorrow As New System.DateTime( _
                        System.DateTime.Today.AddDays(1).Ticks)

' todayEqualsToday gets true.
Dim todayEqualsToday As Boolean = System.DateTime.Equals(today1, today2)

' todayEqualsTomorrow gets false.
Dim todayEqualsTomorrow As Boolean = System.DateTime.Equals(today1, tomorrow)

備註

t1如果屬性值 Ticks 相等，和 t2 就會相等。 其 Kind 屬性值不會在測試中考慮是否相等。

另請參閱

• Boolean
• Compare(DateTime, DateTime)
• CompareTo(Object)