Question

In Java I can iterate collection and remove some objects from it using Iterator.remove() method http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Iterator.html#remove()

This is very handly and natural. Like you are looking for food in the fridge and throw away food with expired date. How to do the same in c#?

I want to iterate and clean-up collection in the same loop.

There are several related question, for example How to iterate and update a list however I still can not find exact duplicate of this operation in c#

Answer 1

If you’re using List<T>, there’s a handy method to do this (RemoveAll), which will remove all elements which match a predicate (expressed as a delegate). For example:

List<Person> people = ...;
people.RemoveAll(person => person.Age < 18);
// Just the adults left now...

This is simpler than iterating backwards, IMO.

Of course, if you’re happy to create a new list instead, you can use LINQ:

var adults = people.Where(person => person.Age >= 18).ToList();