How to Check If an Int Is a Null

Check if integer == null

As stated, an int cannot be null. If a value is not set to it, then the default value I believe is zero. You can do a check for 0 if that is what you think it is being set to...

Otherwise if you are keen on avoiding nullable integers, you would have to turn it into a string and then perform the check.

String.IsNullOrEmpty(ID.ToString());

Which returns a boolean so you can stick it into an if statement.

How to check for null int?

It will compile, but something like the following is probably safer:

public int? myInt;

if (myInt.HasValue && myInt > 0)
{
    Do something
}

How to check an int to see if it is null or has a value

So how do you test this?

You don't, and the compiler is telling you why. int is not a nullable type, so it will never be null and thus the condition will always have the same result.

You may be thinking of int? (short for Nullable<int>), which can be null. In which case a test might look something like:

if (!INIT_VID.HasValue)
{
    // it was null
}

Can't check if int is null

You're comparing a primitive value (int) to null. Since primitives cannot be null, you should use a corresponding object, such as Integer in this case. So, you should write

Integer value = results.get("aKeyThatMayOrMayNotBePresent");

How to check if int is not null

I need bestSeleltRating to be higher than 0 and not null value - actual question being asked.

He is not asking how to make the int nullable.

Below you are checking if a.BestsellerRating > 0 and a.BestsellerRating != null.

You only need a.BestsellerRating > 0. It will never be null and this condition will always check it's higher than 0.

The inverse of this would be a.BestsellerRating == 0

var articles = (from a in _db.Articles
            join articleRating in _db.ArticleRatings on a.Id equals articleRating.ArticleId
            where a.IsDeleted == false
                  && a.IsFinished
                  && a.IsSubmited
                  && a.BestsellerRating > 0
                  && a.BestsellerRating != null

---

Related Topics