?? Do you know the differences between ICollection<T>, IList<T>, and List<T> in C#?

These three interfaces (and class) are fundamental for working with collections in C#, but it's important to understand their roles and use cases to write cleaner and more efficient code. Let’s dive in:

1?? ICollection<T>

• A more generic interface for managing collections.
• Provides basic methods like Add, Remove, Count, and the ability to check for the presence of an item (Contains).
• A great choice when you only need to ensure you're working with something iterable and manageable without worrying about specifics.

2?? IList<T>

• Inherits from ICollection<T> and adds functionality related to indexing.
• Allows you to access and modify elements directly by index (myList[0] = newItem;).
• Ideal when you need an ordered collection and require direct manipulation of specific elements.

3?? List<T>

• A concrete implementation of both IList<T> and ICollection<T>.
• Internally uses a resizable array to store elements.
• Offers flexibility and performance for frequent addition, removal, and direct index access operations.

?? When should you use each one?

• Use ICollection<T> or IList<T> for abstraction and greater flexibility when defining method return types or input parameters.
• Prefer List<T> only when you explicitly need its concrete implementation.

?? What do you think? Have you ever had doubts about these interfaces? Share in the comments how you use these collections in your daily work! ??

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