Change existing "Filter.Rules" of an "ParameterFilterElement"

[Ben_Osborne]

Via the API - you have to first use the Create() method to create the ParameterFilterElement. This is the same as going through the UI and going to filters and creating a new filter and giving it a name. No rules are set yet - it’s just an empty ParameterFilterElement at that point. So in the API - if you use ClearRules() then you have just emptied the rules out of the ParameterFilterElement. You then set the new set of rules the same as when you first created the ParameterFilterElement (see post below)

How to set a series Filter Rules using "OR (Any rule may be ture)" instead of "AND (All rules must be true)"?

I’ve done this using Python in Dynamo. To create a Revit Filter (Parameter Filter Element) you need an ICollection of the categories the filter will apply to and an ElementParameterFilter. The Construction of the Element Parameter Filter is the most confusing part because you can construct ElementParameterFilters our of other previously constructed ElementParameterFilters. To try to show this I’ll make a filter that works on Framing and Columns and test for either Comments Equals “Magnum” OR …