Null-Coalescing Operator

image Closely related to the conditional operator is the well-sounding null-coalescing operator, which was introduced in C# 2.0 as part of the whole nullability straightening mission. When dealing with reference types or nullable value types, it sometimes makes sense to be able to supply a default value as a substitute for null. That’s precisely what the null-coalescing operator provides:

int? deposit = GetDeposit(user);AddToAccount(user, deposit ?? 0);

Written as an infix ?? operator, the null-coalescing operator first evaluates the left operand. If it results in the null reference (for a reference type) or a nullable value ...

Get C# 4.0 Unleashed now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.