LINQ - Find all items in one list that aren't in another list

Question

I\'m stuck with a LINQ query (or any other efficient means of accomplishing the same thing). Can someone show me how I can select all the items in one list that are not pre

Answer 1

Try using .Except extension method (docs):

var result = list1.Except(list2);

will give you all items in list1 that are not in list2.

Answer 2

The easiest way is to use the Except method.

var deletedItems = list1.Except(joinItems);

This will return the set of items in list1 that's not contained in joinItems

Answer 3

Try this:

var List2 = OriginalList.Where(item => !List1.Any(item2 => item2.ID == item.ID));