comparing nullable int inside if statement does not throw

Asked Apr 13 '18 at 12:20

Active Apr 13 '18 at 12:44

Viewed 38 times

Comparing a nullable int inside an if statement seems to work even though it's clearly a null value. The code example below demonstrates the scenario:

List<string> list = null;

var count = list?.Count; //null

if(count > 0) // no complaint, just evaluate to false
{
  Console.WriteLine("greater");
}

if(count == null)
{
  Console.WriteLine("wow! null < 0"); // works like charm
}

From the above, it seems the if statement does not throw, but rather evaluate to false. Can I trust that it will always be the case or am i missing something?

edited Apr 13 '18 at 12:44

asked Apr 13 '18 at 12:20

rethabile

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Yes, you can trust that it will never throw an exception. Read: https://stackoverflow.com/questions/3370110/what-are-lifted-operators – Tim Schmelter Apr 13 '18 at 12:23
Yes, also see: https://learn.microsoft.com/en-us/dotnet/csharp/misc/cs0464 – P.Brian.Mackey Apr 13 '18 at 12:25
Thanks guys. I can now safely push my code to production. :) – rethabile Apr 13 '18 at 12:36

comparing nullable int inside if statement does not throw

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