Numeric properties cannot be nullable

[terabyte-developers]

Which Umbraco version are you using?

8.10.1

Bug summary

the following code returns zero if the property is not set:
ipc.Value<decimal?>(alias)

Specifics

No response

Steps to reproduce

Create a property with 'numeric' datatype.
Set it's value to nothing (blank).
Use the API to access the property like so:
var x = ipc.Value<decimal?>(alias)

Expected result / actual result

If the property in the CMS is blank then x should be null. But it is 0
If the property in the CMS is 0 then x should be 0.

[Myster]

Workaround:

if (ipc.GetProperty(alias).HasValue()) // https://github.com/umbraco/Umbraco-CMS/issues/10369
{
	result.Value = ipc.Value<decimal?>(alias); 
}

[nul800sebastiaan]

Just for clarification: I'm not sure what ipc is? Where does it come from please?

In any case, this is the current behavior and unfortunately we can not change it now, it will be a breaking change because everybody who is currently expecting to see a 0 as a result and is not counting on getting a null as a result is going to have broken sites if we change this. It's very unfortunate but I'm afraid we'll have to live with inconsistencies like this for a bit longer. I think for your case this might be a really nice contribution to: https://our.umbraco.com/packages/developer-tools/supervalueconverters/

On our todo list for a future version (beyond v9), is to make this package obsolete, but if it helps you feel a little bit better about the bad choices we made in the past, I would encourage you to use and contribute to that! 👍

[Myster]

Ahh breaking change yea, that makes sense :-(
Sorry, ipc is an instance of an IPublishedContent, ultimately it would come from something like Current.UmbracoContext.PublishedRequest.PublishedContent