C # a new operator ?? Null coalescing operator

?? "Null coalescing" operator
Is a new operator provided by c #. The function provided by this operator is to determine whether the left-side operand is null. If yes, the return result is the right-side operand, and if not null, the left-side operand is returned.

Let's take a look at the following examples to see how to use this operator:
String message = "Hello World ";
String result = message ?? "Null ";
// The result content here is Hello World

 
Let's take a look at the following example:

String message = null;
String result = message ?? "It's null ";
// The result content here will be It's
Null

For more information about this operator, we can find it in ScottGu's Blog.