What are the best C# collections for memory efficiency?

What are the best C# collections for memory efficiency?

The best C# collections for memory efficiency include arrays, Lists, and HashSets. Arrays are fixed-size and have low overhead, while Lists provide dynamic sizing with minimal memory overhead. HashSets are great for unique items with efficient lookups.

Can you explain why arrays are more memory efficient than Lists?

Arrays are more memory efficient because they have a fixed size and do not require additional memory for resizing or storing metadata. Lists, on the other hand, need extra space for managing their dynamic nature.

What about Dictionary? Is it memory efficient?

Dictionaries can be memory efficient for lookups, but they do have overhead due to storing key-value pairs and managing hash codes. If you need fast access and can afford some overhead, they are a good choice.

Are there any specific scenarios where I should avoid using Lists?

Yes, avoid using Lists when you have a large number of items and need constant-time access. In such cases, consider using arrays or HashSets for better performance.