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Set local enum variable to null

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Posted on by Elda Mataj

190

Hello everybody,

I have a requirement where I need to set the value of TaxBookType enum to null.

So what I did is that I used the nullValue method, but It returns the TaxBookType::NotIncluded(EnumValue = 0).

public void myMethod()
{
    TaxBookType taxBookType;
    taxBookType = nullValue(taxBookType);

    info(strfmt("%1", taxBookType));
}

It prints Not Included.

Does anyone has any idea, if it is possible to assing nullValue to taxBookType enum?

Thank you in advance.

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André Arnaud de Cal... 301,020 Super User 2025 Season 2 on at

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HI Eva,

This is not possible when the enumeration's first value has a meaning. In this case it is NotIncluded. There are some other enumerations (not the one from your example) where a value 'None' with a blank label is used to indicate of there is no value selected.

Can you tell about the background of your question?
Martin Dráb 237,878 Most Valuable Professional on at

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null is used with referenced types, which isn't the case of enums. And there are no nullable references types as in C#.

Valid values of an enum are its elements, nothing else. Technically, you can assing different numbers to the variable (because an enum is implemented as a number), but if you use a number that isn't used by any element, you get an invalid value.
GirishS 27,827 Moderator on at

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Hi Eva,

If you are using the enum control in form you can set null value by using "selection" method of the combo box control but the above one is not possible.

Thanks...

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