DateTime.Equals 方法

参考

定义

命名空间:: System

程序集:: System.Runtime.dll

程序集:: netstandard.dll

程序集:: mscorlib.dll

重要

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返回一个值，该值指示两个 DateTime 对象，或者一个 DateTime 实例和另一个对象或 DateTime 是否具有相同的值。

重载

Equals(DateTime, DateTime)	返回一个值，该值指示的两个 DateTime 实例是否具有同一个日期和时间值。
Equals(DateTime)	返回一个值，该值指示此实例的值是否等于指定 DateTime 实例的值。
Equals(Object)	返回一个值，该值指示此实例是否等于指定的对象。

Equals(DateTime, DateTime)

返回一个值，该值指示的两个 DateTime 实例是否具有同一个日期和时间值。

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

参数

t1: DateTime

要比较的第一个对象。

t2: DateTime

要比较的第二个对象。

Boolean

如果两个值相等，则为，true；否则为 false。

示例

下面的示例演示 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 );

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)

注解

t1``t2如果其属性值相等，则和相等 Ticks 。它们的 Kind 属性值在测试中不被视为相等。

另请参阅

适用于

Equals(DateTime)

返回一个值，该值指示此实例的值是否等于指定 DateTime 实例的值。

public:
 virtual bool Equals(DateTime value);

public bool Equals (DateTime value);

override this.Equals : DateTime -> bool

Public Function Equals (value As DateTime) As Boolean

参数

value: DateTime

要与此实例进行比较的对象。

Boolean

如果 true 参数与此实例的值相等，则为 value；否则为 false。

实现

Equals(T)

示例

下面的示例演示 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.

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.

注解

如果当前实例的 value 属性值相等，则为该实例和相等 Ticks 。它们的 Kind 属性值在测试中不被视为相等。

此方法实现 System.IEquatable<T> 接口，并且执行方式略优于方法， Equals 因为 value 无需将参数转换为对象。

另请参阅

适用于

Equals(Object)

返回一个值，该值指示此实例是否等于指定的对象。

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

public override bool Equals (object value);

public override bool Equals (object? value);

override this.Equals : obj -> bool

Public Overrides Function Equals (value As Object) As Boolean

参数

value: Object

要与此实例进行比较的对象。

Boolean

如果 true 是 value 的实例并且等于此实例的值，则为 DateTime；否则为 false。

示例

下面的示例演示 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.

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.

注解

如果当前实例的 value 属性值相等，则为该实例和相等 Ticks 。它们的 Kind 属性值在测试中不被视为相等。

另请参阅

适用于

通过

DateTime.Equals 方法

定义

重载

Equals(DateTime, DateTime)

参数

返回

示例

注解

另请参阅

适用于

Equals(DateTime)

参数

返回

实现

示例

注解

另请参阅

适用于

Equals(Object)

参数

返回

示例

注解

另请参阅

适用于

其他资源