CODEWITHSUNDEEP
c#linq
Survivor
Survivor

Reputation: 59

How can Array use LINQ extension methods since Array does not implent IEnumerable<T> interface

Here is my program :

static void Main(string[] args)
{
        int[] myArr = new int[] { 4,6,2,1};

        //call Where() linq method
        var myEvenNumbers = myArr.Where(n => n % 2 == 0 );

        Console.Read();
}

but when i look the definition of Where() extension method in Enumerable class

public static IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, bool> predicate);
public static IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> source, Func<TSource, int, bool> predicate);

The type of the source is IEnumerable<T>.

My question is: Array class does not implement IEnumerable<T> but how can we still use the Where() extension method on an array ?

Upvotes: 2

Views: 1136

Answers (2)

Peter Duniho
Peter Duniho

Reputation: 70652

Array doesn't implement IEnumerable<T>, which you'd see if you tried to use something that requires IEnumerable<T> with a variable actually typed as Array. The type-specific array types (like int[] as in your example) do implement IEnumerable<T>, along with other generic types.

Upvotes: 3

David Pilkington
David Pilkington

Reputation: 13620

An array does implement IEnumerable as well as ICollection (and their generics) and a host of other ones

foreach (var type in (new int[3]).GetType().GetInterfaces())
    Console.WriteLine(type);

Produces

enter image description here

Upvotes: 3

Related Questions