Generics in C#

Generic class is a class which can take a type as part of its definition.

Example:

public class ConsoleDisplay<T>
{
    public void Display(T item)
    {
        Console.WriteLine(item);
    }
}

The T is a placeholder for a type, which will be given as an input while creating an instance of the generic class.

In the example below we create an instance of generic ConsoleDisplay<T> class, using string as a parameter.

public static void Main()
{
    var consoleDisplay = new ConsoleDisplay<string>();
    consoleDisplay.Display("Hello World!");
}

Result:

Hello World!

In the same way we could create an object of type ConsoleDisplay<int> to process integer parameter.