What does the interface IEnumerable do in C#?

IEnumerable is an interface defining a single method GetEnumerator() that returns an IEnumerator interface. It is the base interface for all non-generic collections that can be enumerated.

This works for read-only access to a collection that implements that IEnumerable can be used with a foreach statement.

It has a single method −

• GetEnumerator() − This method returns an enumerator that iterates through a collection.

The following is the implementation of the GetEnumerator() method of the IEnumerable interface in C# −

IEnumerator IEnumerable.GetEnumerator() {
return (IEnumerator) GetEnumerator();
}

The following are the extension methods of the IEnumerable interface in C# −