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

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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 usingNullable<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