What are the main data structures in C# that you use?

In C#, the following core data structures are often used:

• List<T> — a dynamic array, convenient for storing and managing collections of elements with the ability to add and remove.
• Dictionary<TKey, TValue> — a hash table for quick access to values by key.
• Queue<T> — a queue for processing elements in FIFO order.
• Stack<T> — a stack for processing elements in LIFO order.
• HashSet<T> — a set for storing unique elements.
• LinkedList<T> — a doubly linked list, useful for frequent insertions and deletions in the middle of the collection.

Example of using List and Dictionary:

var list = new List<int> {1, 2, 3};
list.Add(4);

var dict = new Dictionary<string, int>();
dict["apple"] = 5;
int value = dict["apple"];

The choice of structure depends on the task and performance requirements.