Extension Methods

From RemObjects Software

This is a Oxygene Language Feature topic
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New in .NET 3.0 and 'Joyride'.

Using Extension Methods

The namespace an Extension method-class is defined in has to be in the uses list. The new 3.5 runtime comes with System.Core.dll that provides several extension methods for the IEnumerable<T> interface exposing functions like searching for a subset, returning the first or last element and grouping them.

Writing Extension Methods

See Extension Methods (Writing) for information on writing extension methods.

LINQ and Extension Methods

LINQ doesn't have a hardcoded set of classes it uses for the methods that are called when using LINQ operations on something. Instead it tries to find a method or extension method on the class matching the name. For example: a where condition tries to call a method called "Where", select calls "Select". This approach makes it possible to use LINQ on any kind of class as long as there are extension methods for it.

Product: RemObjects Oxygene (formerly known as Chrome)
Current version: 3.0 Previous Versions: 'Joyride' (2.0), 'Floorshow' (1.5), 'Adrenochrome' (1.0)

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