Showing a Form based upon Null or empty string property

[jeremiah_boe]

I am attempting to show a form only when the property fields are in an empty string or null state. I am stumbling on the "Date" fields accepting null state. I have attached the code that I have assembled thus far, my error comes from the "creation Date" line.

If ThisDoc.Document Is ThisApplication.ActiveDocument  AndAlso 
	iProperties.Value("Summary", "Title") = "" Or
	iProperties.Value("Summary", "Author") = "" Or
	iProperties.Value("Project", "Designer") = "" Or
	iProperties.Value("Project", "Creation Date") = Null Or
	iProperties.Value("Custom", "Drawing Number") = "" Then
	
		iLogicForm.Show("Model iProperties")
End If

[mcgyvr · Accepted solution]

On my system null is not possible and instead the value when the check box is unchecked is..

So check for this as your trigger

iProperties.Value("Project", "Creation Date") = "1/1/1601"

[Curtis_Waguespack]

Hi @jeremiah_boe,

see this related thread from the past:

https://forums.autodesk.com/t5/inventor-customization/how-to-null-all-iproperties-with-ilogic/td-p/6...

Also just as a tip, you can search and ask programming questions of this type on the Inventor Customization forum :
http://forums.autodesk.com/t5/Autodesk-Inventor-Customization/bd-p/120

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com

[NachoShaw · Accepted solution]

I would also trim the values to remove any rogue spaces.

TRIM(Value)

For strings, I prefer String.Empty over ""

N ACHO