Question

I have a list (List<T>) of objects aList and another list bList.

How to use Linq to delete all objects from aList contained in bList?

Answer 1

The simplest way would be to do this:

foreach(var item in bList) aList.Remove(item);

Remove doesn’t do anything if the item isn’t already in the list.

If by “use LINQ” you mean use LINQ to determine if an item in aList is in bList, that’s not necessary.

A LINQ solution would be more efficient ONLY if both of these conditions are true:

1. aList is very small compared to bList
2. All of the items in aList that are also in bList are at the very beginning of bList