>>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)

How the code should look like after I added this class?

I added it inside the APIController file (beneath the class).