>Hi everybody,
>
>How can I get difference between these two Dictionaries using except operator? I'm trying this code but it doesn't compile
>
>

>prefsRetailViewModel.AvailableTrackingColumns = this.trackingLookupOrderColumns.Except(prefsRetailViewModel.AssignedTrackingColumns);

>
>All of them are defined as
>

>Dictionary<string, string>

>
>Thanks a lot in advance.

If you want to use Except you could implement IEqualityComparer:

public class StringDictionaryComparer : IEqualityComparer<KeyValuePair<string,string>>
        {
            public bool Equals (KeyValuePair<string, string> a , KeyValuePair<string, string> b)
            {
                return a.Key == b.Key;
            }

            public int GetHashCode(KeyValuePair<string, string> item)
            {
                return item.GetHashCode();
            }
        }

Your code should then work (assuming you only need to check the key)