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C# Interfaces

An interface defines a set of properties, methods and events that a class can implement. It specifies what a class must provides, if it implements the interface.

It does not provide any implementation of its element.

It is defined with the keyword interface, followed by its name, in Pascalcase and starting with I

interface IAnimal {
    void Eat();
    int Legs { get; }
}

An interface can contain a declaration of:

• Methods
• properties
• Indexers
• Events

Note: can’t contain field

implementation

To implement an interface in a class, it must:

• follow the class declaration after :
• implement the elements of the interface inside the class

class Dog : IAnimal 
{
    public int Legs { get; }

    public void Eat()
    {
        Console.WriteLine("The dog is eating");
    }
}