The Except
method returns IEnumerable
, you need to convert the result to list:
list1 = list1.Except(list2).ToList();
Here’s a complete example:
List<String> origItems = new List<String>();
origItems.Add("abc");
origItems.Add("def");
origItems.Add("ghi");
List<String> newItems = new List<String>();
newItems.Add("abc");
newItems.Add("def");
newItems.Add("super");
newItems.Add("extra");
List<String> itemsOnlyInNew = newItems.Except(origItems).ToList();
foreach (String s in itemsOnlyInNew){
Console.WriteLine(s);
}
Since the only items which don’t exist in the origItems are super & extra, The result output is :
super
extra