Create a new project parameter only if it does not already exist

[sajithwetta]

How do I create a new project parameter via Dynamo only if it does not exist in the current project?
Is there a way to set up an If condition?

[m.rijsmus]

Try Element.ParameterExists from Clockwork

[Jan_Secnik]

you can try something like this:

in List.ContainsItem - ITEM just put string that you are looking for.

[sajithwetta]

How do I pass a null value or prevent creating a new parameter?

[Jan_Secnik]

You just need to use Boolean result from List.ContainsItem on Names and Parameter Types (everything that is list).

[CamilleVandervaeren]

Is this problem solved? I don’t see how to connect the boolean result list to the node Parameter.CreateProjectParameter

[Jan_Secnik]

You need to filter Parameter Names with your boolean.

[CamilleVandervaeren]

OK it works! Thanks.

[Jan_Secnik]

Just mark it as solution. TY

[CamilleVandervaeren]

I think it’s more effective to make my print screen appear as solution than the one above. As beginner user, I needed some minutes to figure out how to connect it with Parameter.CreateProjectParameter. Thanks for the solution anyway!

[mathijs.stevens]

What do you feed into “element” in the Element.ParameterExists node?

[Jan_Secnik]

Any element that has that parameter.