EN
C# / .NET - static Equals() vs non-static Equals()
7 points
In this short article, we would like to explain what is difference between static Equals() vs non-static Equals() in C#.
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Object firstObject = ...2
Object secondObject = ...3
4
bool result = object.Equals(firstObject, secondObject); // or: Object.Equals(firstObject, secondObject)Syntax:
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public static bool Equals(object? objA, object? objB);xxxxxxxxxx1
Object firstObject = ...2
Object secondObject = ...3
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bool result = firstObject.Equals(secondObject);Syntax:
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public virtual bool Equals(object? obj);
Static Equals() should be used when some of the compared objects may be null - it was created to prevent against NullReferenceException occurrences. Non-static Equals() method is called when some argument is not null.
If we would like to propose how public static bool Equals(object? objA, object? objB) method may be implemented, we could use:
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public class Object2
{3
public static bool Equals(object? objA, object? objB)4
{5
if (objA == null)6
return objB == null;7
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if (objB == null) return false;9
if (objA == objB) return true;10
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return objA.Equals(objB);12
}13
}
