Breaking News: Grepper is joining You.com. Read the official announcement!

c# check null with question mark

Munam Yousuf answered on December 1, 2022 Popularity 6/10 Helpfulness 5/10

answer c# check null with question mark

c# check null with question mark

Comment

709


It's the null conditional operator. It basically means:

"Evaluate the first operand; if that's null, stop, with a result of null. Otherwise, evaluate the second operand (as a member access of the first operand)."

In your example, the point is that if a is null, then a?.PropertyOfA will evaluate to null rather than throwing an exception - it will then compare that null reference with foo (using string's == overload), find they're not equal and execution will go into the body of the if statement.

In other words, it's like this:

string bar = (a == null ? null : a.PropertyOfA);
if (bar != foo)
{
    ...
}

Popularity 6/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: c# javascript null

Link to this answer
Share Copy Link