Question

The System.Array class implements ICollection interface.
This interface has a public property called Count which gives the number of elements in the array.

Suppose I declare an Array and access its properties

Array numbers = Array.CreateInstance(typeof(int), 10);
Console.WriteLine(numbers.Count);

You would expect to see 10 on the screen.
But, I am not able to see Count property after putting a period after numbers. There is however, a property called Length. Why is it so?

Update:
This is because of Explicit Interface Implementation. Since there is another question similar to mine, I decided to re-word it.
Why was the design decision taken to explicitly implement this particular property? There is another property with the same functionality Length. So why go through the trouble of providing the explicitly implemented Count?

Answer 1

System.Array class implements ICollection interface explicitly.
You can use methods of ICollection only after casting Array to ICollection

Array numbers = Array.CreateInstance(typeof(int), 10);
ICollection numbersCollection =  (ICollection)numbers;
Console.WriteLine(numbersCollection.Count);

Implicit and Explicit Interface Implementations

System.Array.Count actually uses Array.Length property

int ICollection.Count
{
    get
    {
        return this.Length;
    }
}