C# Objects: When Should I Use `==` vs. `Equals()`?

C# operator: The difference between understanding == and equals ()

In some programming scenarios, developers may encounter accidents when using equal computing (==) and Equals () methods. This difference is particularly confusing when == returns false and equals () to return true, such as the example shown above.

== working principle:

When applied to the object, equal computing (==) depends on the ReferenceEquals () method. This method checks whether the two objects reference the same physical location in the memory. In simple terms, it determines whether the object is exactly the same, not just a copy with the same value.

Equals () working principle:

On the other hand, the Equals () method is a virtual method that allows the class to rewrite the default implementation. By default, the value of Equals () compares from System.Object is derived from System.Object. However, the class can rewrite this behavior to provide custom comparisons in accordance with its specific requirements. Example:

In the example provided, the Content property of Listboxitem is being checked with the string "Energy Attack". When using ==, it fails because these two string are not stored in the same memory location. However, Equals () returns true because the values ​​of the string are the same.

The importance of understanding differences:

The difference between understanding == and equals () is very important, which can prevent accidental behavior and ensure the correct execution of the code. When it is more likely to rewrite the objects implemented by Equals (), using EQUALS () is a safer and more reliable method to ensure the correct equal check according to the expected semantics of the class.

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