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Question

remove content of list from another list

Answer 1

+8 A:

list1.RemoveAll(i => list2.Contains(i));

James 2010-05-17 10:36:32

+1 altho the names `myList` and `myOtherList` are misleading in the context, as they are the exact opposite of the requested "remove ... from anotherlist"

David Hedlund 2010-05-17 10:38:25

@David, good point I will change them

James 2010-05-17 10:40:24

Does this remove objects that are the same object, or object that equal each other (o1.Equals(o2))?

SeaDrive 2010-05-17 19:03:23

@SeaDrive: See http://msdn.microsoft.com/en-us/library/bhkz42b3(VS.80).aspx

James 2010-05-18 07:50:15

Answer 2

A:

Here is a short addition and advise to James post.

If you are using List<T> and the myOtherList contains many items you should convert it to a Hashset<T> var set = new Hashset(myOtherList), so his solution should run much faster.

DHN 2010-05-17 10:42:09

Answer 3

A:

List<object> result = anotherlist.Except(list).ToList();

VMAtm 2010-05-17 10:50:31

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remove content of list from another list

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