Why can't we assign a foreach iteration variable, whereas we can completely modify it with an accessor?

Question

I was just curious about this: the following code will not compile, because we cannot modify a foreach iteration variable:

        foreach (var item in MyObj         


        

Answer 1

Because the first one doesn't make much sense, basically. The variable item is controlled by the iterator (set on each iteration). You shouldn't need to change it- just use another variable:

foreach (var item in MyObjectList)
{
    var someOtherItem = Value;

    ....
}

As for the second, there are valid use cases there- you might want to iterate over an enumeration of cars and call .Drive() on each one, or set car.gasTank = full;