Nullable<T>.Equals(Object) Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Nullable.cs

Source:: Nullable.cs

Source:: Nullable.cs

Important

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Indicates whether the current Nullable<T> object is equal to a specified object.

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

public override bool Equals (object other);

public override bool Equals (object? other);

override this.Equals : obj -> bool

Public Overrides Function Equals (other As Object) As Boolean

Parameters

other: Object

An object.

Returns

Boolean

true if the other parameter is equal to the current Nullable<T> object; otherwise, false.

This table describes how equality is defined for the compared values:

Return Value	Description
`true`	The HasValue property is `false`, and the `other` parameter is `null` (that is, two null values are equal by definition), OR the HasValue property is `true`, and the value returned by the Value property is equal to the `other` parameter.
`false`	The HasValue property for the current Nullable<T> structure is `true`, and the `other` parameter is `null`, OR the HasValue property for the current Nullable<T> structure is `false`, and the `other` parameter is not `null`, OR the HasValue property for the current Nullable<T> structure is `true`, and the value returned by the Value property is not equal to the `other` parameter.

Examples

The following code example determines whether an object and a Nullable<T> object are equal to the current Nullable<T> object.

// This code example demonstrates the Nullable<T>.Equals
// methods.

using System;

class Sample
{
    public static void Main()
    {
    int? nullInt1 = 100;
    int? nullInt2 = 200;
    object myObj;

// Determine if two nullable of System.Int32 values are equal.
// The nullable objects have different values.
    Console.Write("1) nullInt1 and nullInt2 ");
    if (nullInt1.Equals(nullInt2))
        Console.Write("are");
    else
        Console.Write("are not");
    Console.WriteLine(" equal.");

// Determine if a nullable of System.Int32 and an object
// are equal. The object contains the boxed value of the
// nullable object.

    myObj = (object)nullInt1;
    Console.Write("2) nullInt1 and myObj ");
    if (nullInt1.Equals(myObj))
        Console.Write("are");
    else
        Console.Write("are not");
    Console.WriteLine(" equal.");
    }
}

/*
This code example produces the following results:

1) nullInt1 and nullInt2 are not equal.
2) nullInt1 and myObj are equal.

*/

// This code example demonstrates the Nullable<T>.Equals
// methods.
open System

let nullInt1 = Nullable 100
let nullInt2 = Nullable 200

// Determine if two nullable of System.Int32 values are equal.
// The nullable objects have different values.
printf "1) nullInt1 and nullInt2 "
if nullInt1.Equals nullInt1 then
    printf "are"
else
    printf "are not"
printfn " equal."

// Determine if a nullable of System.Int32 and an object
// are equal. The object contains the boxed value of the
// nullable object.

let myObj = box nullInt1
printf "2) nullInt1 and myObj "
if nullInt1.Equals myObj then
    printf "are"
else
    printf "are not"
printfn " equal."

// This code example produces the following results:
//     1) nullInt1 and nullInt2 are not equal.
//     2) nullInt1 and myObj are equal.

' This code example demonstrates the Nullable(Of T).Equals 
' methods.

Class Sample
    Public Shared Sub Main() 
        Dim nullInt1 As Nullable(Of Integer) = 100 
        Dim nullInt2 As Nullable(Of Integer) = 200
        Dim myObj As Object
        
    ' Determine if two nullable of System.Int32 values are equal. 
    ' The nullable objects have different values.
        Console.Write("1) nullInt1 and nullInt2 ")
        If nullInt1.Equals(nullInt2) Then
            Console.Write("are")
        Else
            Console.Write("are not")
        End If
        Console.WriteLine(" equal.")
        
    ' Determine if a nullable of System.Int32 and an object 
    ' are equal. The object contains the boxed value of the
    ' nullable object.
        myObj = CType(nullInt1, Object)
        Console.Write("2) nullInt1 and myObj ")
        If nullInt1.Equals(myObj) Then
            Console.Write("are")
        Else
            Console.Write("are not")
        End If
        Console.WriteLine(" equal.")
    End Sub
End Class

'
'This code example produces the following results:
'
'1) nullInt1 and nullInt2 are not equal.
'2) nullInt1 and myObj are equal.
'

Remarks

If the HasValue property of the current Nullable<T> structure is true and the other argument is not null, equality is determined by passing the other parameter to the Equals method of the underlying value of the current Nullable<T> structure.

Applies to

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