#215 – Using the Null-Coalescing (??) Operator with Custom Nullable Types

In addition to the built-in nullable types, you can also use the null-coalescing operator on custom nullable types using Nullable<T>.

Here’s an example:

            Nullable<Mood> myMood1 = null;
            Nullable<Mood> myMood2 = Mood.Petulant;

            Mood mood3 = myMood1 ?? Mood.Happy;   // result = Happy
            Mood mood4 = myMood2 ?? Mood.Happy;   // result = Petulant