Visual Basic 2015 Unleashed

The IEnumerable Interface

You implement the IEnumerable interface each time you want your class to support For..Each loops. Each time you iterate an object (typically a collection) using For Each, it is because that object implements IEnumerable. The .NET Framework offers lots of collections (including generic ones) and enables you to create custom collections inheriting from built-in ones; therefore, implementing IEnumerable will probably be spared for you. It’s important to understand how the interface works, especially for its intensive usage when working with LINQ. IEnumerable provides one method, named GetEnumerator, which generally is implemented as follows:

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Public Function GetEnumerator() As System.Collections.IEnumerator ...