How to retrieve parameters under a certain parameter group?

[Anonymous]

I use C# to develop REVIT 2016 add-ins.

I want to iterate through all the parameters under BuiltInParameterGroup.PG_IDENTITY_DATA. However, I can only get all the parameters from a single element and  filter every parameter which costs so much time. So I want to know there is some way to iterate through the parameters only under a certain group.

[jeremytammik · Accepted solution]

As far as I can tell from the Revit API documentation, you have three options to retrieve parameters:

• Get a single specific parameter by `Definition`, built-in parameter enum, or GUI
• Get all parameters with a specific display name
• Get all parameters

I do not see any possibility to limit the selection to a parameter group.

For that, I would get all and eliminate those belonging to the other groups.

Why do you say this is slow?

It can't be all that slow, from my experience...