Object.ReferenceEquals() Method in C#
Last Updated :
22 Nov, 2022
Object.ReferenceEquals() Method is used to determine whether the specified Object instances are the same instance or not. This method cannot be overridden. So, if a user is going to test the two objects references for equality and is not sure about the implementation of the Equals method, then he can call the ReferenceEquals method.
Syntax: public static bool ReferenceEquals (object ob1, object ob2);
Parameters:
ob1: It is the first object to compare.
ob2: It is the second object to compare.
Return Value: This method returns true if ob1 is the same instance as ob2 or if both are null otherwise, it returns false.
Below programs illustrate the use of Object.ReferenceEquals() Method:
Example 1:
csharp
using System;
using System.Globalization;
class GFG {
public static void Main()
{
object v1 = null ;
object v2 = null ;
bool status = Object.ReferenceEquals(v1, v2);
if (status)
Console.WriteLine( "null is equal to null" );
else
Console.WriteLine( "null is not equal to null" );
}
}
|
Output:
null is equal to null
Example 2:
csharp
using System;
using System.Globalization;
class GFG {
public static void Main()
{
object p = new Object();
object q = null ;
get (p, null );
q = p;
get (p, q);
get (q, null );
}
public static void get ( object v1,
object v2)
{
bool status = Object.ReferenceEquals(v1, v2);
if (status)
Console.WriteLine( "{0} is equal to {1}" ,
v1, v2);
else
Console.WriteLine( "{0} is not equal to {1}" ,
v1, v2);
}
}
|
Output:
System.Object is not equal to
System.Object is equal to System.Object
System.Object is not equal to
Note: Here, null will never be printed in the output. Important Points:
- If both ob1 and ob2 represent the same instance of a value type, then this method nevertheless returns false.
- If ob1 and ob2 are strings, then this method will return true if the string is interned because this method will never perform a test for value equality.
Reference:
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