List 'Except' comparison - ignore case

c# list ienumerable case-sensitive
john picture john · Sep 5, 2014 · Viewed 9.5k times · Source

I have two lists and I want to compare them and get the differences, while ignoring any case differences.

I have used the following code to get the differences between the two lists but it does not ignore case differences.

IEnumerable<string> diff = list1.Except(list2);
List<string> differenceList = diff.ToList<string>();

I tried this:

IEnumerable<string> diff = list1.Except(list2, StringComparison.OrdinalIgnoreCase);

but Except does not seem to be having a string case check of that sort (so error). I'm hoping there's a work around.

Answer

Damitha Shyamantha picture Damitha Shyamantha · Sep 5, 2014

Try this :)

List<string> except = list1.Except(list2, StringComparer.OrdinalIgnoreCase).ToList();

Worked for me!

Related questions

How can I add an item to a IEnumerable<T> collection?

My question as title above. For example, IEnumerable<T> items = new T[]{new T("msg")}; items.ToList().Add(new T("msg2")); but after all it only has 1 item inside. Can we have a method like items.Add(item)? …

Read More
IEnumerable vs List - What to Use? How do they work?

I have some doubts over how Enumerators work, and LINQ. Consider these two simple selects: List<Animal> sel = (from animal in Animals join race in Species on animal.SpeciesKey equals race.SpeciesKey select animal).Distinct().ToList(); or IEnumerable&…

Read More
Converting from IEnumerable to List

I want to convert from IEnumerable<Contact> to List<Contact>. How can I do this?

Read More