Determines whether the specified Object instances are the same instance.
(in mscorlib.dll)
Visual Basic (Declaration)
Public Shared Function ReferenceEquals ( _
objA As Object, _
objB As Object _
) As Boolean
Dim objA As Object
Dim objB As Object
Dim returnValue As Boolean
returnValue = Object.ReferenceEquals(objA, _
objB)
public static bool ReferenceEquals(
Object objA,
Object objB
)
public:
static bool ReferenceEquals(
Object^ objA,
Object^ objB
)
public static function ReferenceEquals(
objA : Object,
objB : Object
) : boolean
Return Value
Type:
System..::.Boolean
true if objA is the same instance as objB or if both are null references; otherwise, false.
The following code example uses ReferenceEquals to determine if two objects are the same instance.
Imports System
Public Class App
Public Shared Sub Main()
Dim o As Object = Nothing
Dim p As Object = Nothing
Dim q As New Object
Console.WriteLine(Object.ReferenceEquals(o, p))
p = q
Console.WriteLine(Object.ReferenceEquals(p, q))
Console.WriteLine(Object.ReferenceEquals(o, p))
End Sub
End Class
' This code produces the following output:
'
' True
' True
' False
'
using System;
class MyClass {
static void Main() {
object o = null;
object p = null;
object q = new Object();
Console.WriteLine(Object.ReferenceEquals(o, p));
p = q;
Console.WriteLine(Object.ReferenceEquals(p, q));
Console.WriteLine(Object.ReferenceEquals(o, p));
}
}
/*
This code produces the following output.
True
True
False
*/
using namespace System;
int main()
{
Object^ o = nullptr;
Object^ p = nullptr;
Object^ q = gcnew Object;
Console::WriteLine( Object::ReferenceEquals( o, p ) );
p = q;
Console::WriteLine( Object::ReferenceEquals( p, q ) );
Console::WriteLine( Object::ReferenceEquals( o, p ) );
}
/*
This code produces the following output.
True
True
False
*/
import System
class MyClass {
static function Main() {
var o = null;
var p = null;
var q = new Object();
Console.WriteLine(Object.ReferenceEquals(o, p));
p = q;
Console.WriteLine(Object.ReferenceEquals(p, q));
Console.WriteLine(Object.ReferenceEquals(o, p));
}
}
MyClass.Main();
/*
This code produces the following output.
True
True
False
*/
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
.NET Compact Framework
Supported in: 3.5, 2.0
XNA Framework
Supported in: 3.0, 2.0, 1.0
Reference