Generics in C#

Generics in C# are a powerful feature that allow you to write code that can be used with any data type. Generics make it possible to write reusable code that can work with different types of data without having to write separate code for each type.

In C#, generics are implemented using type parameters. Type parameters define a placeholder for a specific type that will be determined at runtime. When you use a generic class or method, you specify the type parameter that will be used to create an instance of that class or call that method.

For example, consider the following generic method:

public static void PrintArray(T[] arr)
{
    foreach (T item in arr)
    {
        Console.WriteLine(item);
    }
}

This method takes an array of any type and prints each item in the array to the console. The type parameter `T` is used to specify the type of the array at runtime.

To call this method with an array of integers, you would use the following code:

int[] numbers = { 1, 2, 3, 4, 5 };
PrintArray(numbers);

To call this method with an array of strings, you would use the following code:

string[] words = { "hello", "world" };
PrintArray(words);

Generics are widely used in C# collections such as `List`, `Dictionary`, and `Queue`, aswell as in LINQ queries, where they allow you to write queries that can be used with any type of data.

Overall, generics in C# provide a powerful and flexible way to write reusable code that can work with any data type. By using generics, you can write code that is more efficient, type-safe, and easier to maintain.