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LINQ and Extension Methods

Recall from the previous chapter that extension methods make it possible to add new members to a

previously compiled type within the scope of a given project. Although the current example does

not have you author any extension methods directly, you are in fact using them seamlessly in the

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background. LINQ query expressions can be used to iterate over data containers that implement

the generic IEnumerable interface. However, the .NET System.Array class type (used to represent

our array of strings and array of integers) does 

not implement this behavior: