Hello,
I am trying to add a shared parameter to certain categories by using defined shared parameters in shared parameter file.
In GUI this would be done with Manage->Project Parameters -> Add -> Shared Parameter (select categories, and grouping info, ect) ...
My issue is, that I want to add an existing parameter to new categories without disturbing the parameter and it's values for elements of existing categories.
Example:
1) I add a parameter "PARAM1" to category "Lighting Fixtures"
2) I edit the "PARAM1" values for each Lighting Fixture element
3) I expand the category list of the same parameter "PARAM1" to "Lighting Fixtures" and "Cable Trays"
4) Values set in step 2 should not have changed
For my solution see below.
The confusing part is, that sometimes the parameter value (for previously set, existing categories) get reset, and sometimes they are retained (desired outcome).
"sometimes" - as in - it works in a small, isolated test project, but doesn't work in a large production file (parameter values are reset).
My solution so far:
I can create and add a new binding definition to Document.ParameterBindings.
The issue arises if I need to expand the selected category list. In that case, I do the following:
1) get the associated categories from existing binding definition,
2) recreate category set and add the new categories to it,
3) remove the old binding definition
4) add back the binding definition with updated categories
What else should I be taking into account? Am I missing something? Why does it work only sometimes?
Here is my method to add a specific shared parameter to selected categories:
public static void CreateProjectParam(Application app, Guid paramGUID, CategorySet newCats, BuiltInParameterGroup group, bool inst)
{
// get shared parameter file
DefinitionFile defFile = app.OpenSharedParameterFile();
if (defFile == null) return;
// get parameter defintion from the file
var v = (from DefinitionGroup dg in defFile.Groups
from ExternalDefinition d in dg.Definitions
where d.GUID == paramGUID
select d);
if (v == null || v.Count() < 1) return;
ExternalDefinition def = v.First();
// get project parameter bindings
BindingMap map = (new UIApplication(app)).ActiveUIDocument.Document.ParameterBindings;
// Check if binding already exists and recreate the category list with new additions
if (map.Contains(def))
{
ElementBinding existingDef = (ElementBinding)map.get_Item(def);
var existingCats = existingDef.Categories;
foreach (Category cat in existingCats)
{
if (!newCats.Contains(cat))
{
newCats.Insert(cat);
}
}
}
// create the new binding with updated category list
Autodesk.Revit.DB.Binding binding = app.Create.NewTypeBinding(newCats);
if (inst) binding = app.Create.NewInstanceBinding(newCats);
// remove old binding definition and add it back again with updated category list
map.Remove(def);
map.Insert(def, binding, group);
// other settings
SetInstanceParamVaryBetweenGroupsBehaviour((new UIApplication(app)).ActiveUIDocument.Document, paramGUID, true);
}
