C# List<object>.RemoveAll() - How to remove a subset of the list?

Question

I have a 2 classes feeds_Auto and Product with multiple matching properties. For this particular problem, the AutoID is the only field I n

Answer 1

You can use Any to simplify

source.RemoveAll(a => dropSourceList.Any(b => a.AutoID == b.AutoID));

You can reduce the looping by creating a HashSet of ID's first:

var toRemove = new HashSet<int>(dropSourceList.ConvertAll(a => a.AutoID));

source.RemoveAll(a => toRemove.Contains(a.AutoID));