Code Inspection: '?:' expression can be re-written as '??' expression

tip

You can suppress this inspection to ignore specific issues, change its severity level to make the issues less or more noticeable, or disable it altogether.

If you want to assign a value, pass an argument, or return from a method based on the nullability of an identifier, the clearest syntax you can use in these cases is the ?? (null-coalescing) operator.

Therefore, whenever ReSharper encounters a conditional ?: (ternary) operator in the above-mentioned contexts, it suggests simplifying the expressions using the ?? operator.

Here is an example of a quick-fix suggested by this inspection:

void Foo(string input)
{
  Console.WriteLine($"The input is {(input != null ? input : "empty")}");
}

void Foo(string input)
{
  Console.WriteLine($"The input is {(input ?? "empty")}");
}

tip

Reverse transformation is available with a context action Alt+Enter.

Speaking about performance of both operators, there is no observable difference. Actually, the ?? is even a tiny bit faster.