I can not access Count property of the array but through casting to ICollection !

Question

        int[] arr = new int[5];
        Console.WriteLine(arr.Count.ToString());//Compiler Error
        Console.WriteLine(((ICollection)arr).Count.ToString());//works p         


        

Answer 1

Arrays have .Length, not .Count.

But this is available (as an explicit interface implementation) on ICollection etc.

Essentially, the same as:

interface IFoo
{
    int Foo { get; }
}
class Bar : IFoo
{
    public int Value { get { return 12; } }
    int IFoo.Foo { get { return Value; } } // explicit interface implementation
}

Bar doesn't have public a Foo property - but it is available if you cast to IFoo:

    Bar bar = new Bar();
    Console.WriteLine(bar.Value); // but no Foo
    IFoo foo = bar;
    Console.WriteLine(foo.Foo); // but no Value