Does Array.ToArray<>() return the original array if it is the same type?

Question

Hi!

I deal with a framework on a daily basis where we sometimes provide methods that accept IEnumerable<MyBusinessObject> as a parameter in order to show user interfaces, perform calculations etc.

If I pass in an array of MyBusinessObject like so:

MyBusinessObject[] myArray = new MyBusinessObject { obj1, obj2, ..., objN };
frameworkClass.MyMethod(myArray);

....

public class FrameworkClass
{
    public void MyMethod(IEnumerable<MyBusinessObject> objs)
    {
        // Other code that uses the enumerable
        MyBusinessObject[] objectArray = objs.ToArray();            
        // More code that uses the enumerable
    }
}

Does the line objs.ToArray() simply resolve the IEnumerable<MyBusinessObject> back to the original array, or does it copy it to a whole new array, ready for use?

Answer 1

No, you will always get a new copy of the array, though the objects in it aren't copies, they are the same references as in the original array.

It would be very inconsistent for changes to the returned array to sometimes affect the source and sometimes not. ToList works the same way for the same reason.