Question

I had this code :

foreach (object obj in _Destinations)
{
    obj = _ItemsSource;
}

which was generating the error

Cannot assign to ‘obj’ because it is a ‘foreach iteration variable’

So I “circled” the problem with the following code :

for (int i = 0; i < _Destinations.Count; i++)
{
    _Destinations[i] = _ItemsSource;
}

This works on my actual cases but I’m not sure that this is the exact same thing for any type of object. Is that the case ?

EDIT : _Destinations is a List<object>

Answer 1

This is definitely not the same exact thing: for starters, the second one works, while the first one does not 🙂

The reason the first snippet does not work is because it uses an iterator from the _Distance list, and it is not possible to assign to the original collection through IEnumerable<T>‘s iterator. The second snippet uses [index] to access the underlying list or array. This construct allows reading and writing; that’s why it works.

As far as accessing all elements of the list or array in the same order is concerned, both constructs are identical.