Extension methods
Extension methods are static methods that can be invoked using the instance method syntax. In effect, extension methods make it possible for us to extend existing types and constructed types with additional methods.
For example, we can define an extension method as follows:
public static class MyExtensions { public static bool IsCandy(this Product p) { if (p.ProductName.IndexOf("candy") >= 0) return true; else return false; } }
In this example,
the static method IsCandy
takes a this
parameter of the Product
type and searches for the string candy
inside the product name. If it finds a match, it assumes this
is a candy
product and returns true
. Otherwise, it returns false
, meaning this
is not a candy
product.
Because all extension ...
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