Why are Mutable Structs Considered Problematic in C#?

The variable structure in C#: a Pandora magic box

The variable structures in C# are often reprimanded as "evil", which brings unique challenges. It is essential to understand why these structures are so infamous for writing a strong and reliable code.

The structure in

C# is a value type, which means that a copy will be created every time the structure is transmitted. This means that one of the copies will only affect local instances, and the original copy and other existing copies remain unchanged.

Suppose you have a variable structure that represents the name of the character. When you pass this structure to a classmate for assignment, an unexpected trap lurks. Modify the name of a student in the array will secretly create a copy, and the original record remains unchanged. As a result, the content of the array became a collection of names, some of them were covered, and others remained unchanged.

On the other hand, the unable changeable structure is a stable lighthouse in this turbulent field. Their immutability ensures that all automatic copies generated by passing them remain unchanged. Any attempt to change its original form will force a conscious choice and need to create a new instance that contains modified data. In this way, unsatisfactory acts of data integrity are used to prevent accidental modifications from disorder and unpredictable behaviors.

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