c# - Why am I getting "CS0472: The result of the expression is always true since a value of type int is never equal to null of type int?"

Question

string[] arrTopics = {"Health", "Science", "Politics"};

I have an if statement like:

 if (arrTopics.Count() != null)

When I hover my mouse over the above statement, it says:

Warning CS0472: The result of the expression is always true since a value of type int is never equal to null of type int?

I am not able to figure out why it is saying so. Can anybody help me?

Answer 1

int can never be equal to null. int? is the nullable version, which can be equal to null.

You should check if(arrTopics.Count() != 0) instead.