topic Re: How to define Document ParameterBindings Definition is shared parameter and get GUID? in Revit API Forum

How to define Document ParameterBindings Definition is shared parameter and get GUID?

s04049 — Wed, 24 Nov 2021 14:56:08 GMT

Hello

I am trying to define shared Parameter and project parameter form doc.ParameterBindings function,

however I got Object reference not set to an instance of an object error, even is shared parameter object.

I am following an old blog post , is there any change on revit 2021?

https://spiderinnet.typepad.com/blog/2011/05/parameter-of-revit-api-30-project-parameter-information.html

BindingMap I_BM=_doc.ParameterBindings; DefinitionBindingMapIterator it = I_BM.ForwardIterator(); it.Reset(); while(it.MoveNext()) { Definition def = it.Key; try { ExternalDefinition extDef = def as ExternalDefinition; MessageBox.Show(extDef.GUID.ToString()); } catch(Exception ex) { //Normal Project Parameter MessageBox.Show(ex.Message+ex.StackTrace); } }

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

RPTHOMAS108 — Wed, 24 Nov 2021 18:31:49 GMT

Instances of the ExternalDefinition class only exist in the shared parameter file (DefinitionsFile) and are only used for methods that deal with that.

You therefore can't cast to one from the bindings keys, these I think are of type InternalDefinition. If so this has the method InternalDefinition.GetTypeId that will hold the GUID (if definition is for a shared parameter).

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

s04049 — Thu, 25 Nov 2021 11:21:17 GMT

Getting into the Building Map with Revit Lookup, there are only show Instance Binding and Type Binding.

nothing to get from there.

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

RPTHOMAS108 — Thu, 25 Nov 2021 11:33:22 GMT

Yes, but you were iterating the map with DefinitionBindingMapIterator and getting the key values (Keys are the Definitions not the values). RevitLookup doesn't do that.

i.e. BindingMap.Item property takes a Definition to return a Binding.

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

RPTHOMAS108 — Thu, 25 Nov 2021 13:00:18 GMT

Public Function Obj_211125a(commandData As ExternalCommandData, ByRef message As String, elements As ElementSet) As Result Dim app = commandData.Application Dim uidoc = commandData.Application.ActiveUIDocument Dim IntDoc = uidoc.Document Dim PB As BindingMap = IntDoc.ParameterBindings Dim PBM_FwdIt As DefinitionBindingMapIterator = PB.ForwardIterator PBM_FwdIt.Reset() While PBM_FwdIt.MoveNext = True Dim IDef As InternalDefinition = PBM_FwdIt.Key Dim Ty As String = "" If PBM_FwdIt.Current.GetType = GetType(InstanceBinding) Then Ty = "(Instance)" ElseIf PBM_FwdIt.Current.GetType = GetType(TypeBinding) Then Ty = "(Type)" End If Debug.WriteLine(IDef.Name & " " & IDef.GetTypeId.TypeId & " " & Ty) End While Return Result.Succeeded End Function

Sample output for project parameter:
rpt autodesk.parameter.aec.revit.project:610094-1.0.0 (Instance)

Sample output for shared parameter:
ProfileAngle autodesk.parameter.aec.revit.external.-1:e544d5d1a0cb490bb276d191cd8b1456-1.0.0 (Type)

So can be seen from above you can get the Guid of the shared parameter or the ElementId (presumed) of the non-shared project parameter using the above method. The Guid is not in a convenient form but you can get it. Not sure if there is an easier way because the SharedParameterElement class is not just for those bound in the project.

Although you can't cast an InternalDefinition to an ExternalDefinition you can feed an ExternalDefinition into BindingMap.Item to get the binding (which is more common).

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

s04049 — Fri, 26 Nov 2021 12:03:08 GMT

I am sorry, I can't find the GetTypeId method on InternalDefinitions class.

can you explain in more detail to define the external parameter in BindingMap Class?

https://www.revitapidocs.com/2021.1/1f5f93dd-0ddc-c7d6-9ac1-332f0f14a5ae.htm

Re: How to define Document ParameterBindings Definition is shared parameter and get GUID?

RPTHOMAS108 — Fri, 26 Nov 2021 12:31:36 GMT

Sorry didn't see you were limited to 2021, it was probably introduced in 2022.

Here is a better alternative for both anyway:

Public Function Obj_211126a(commandData As ExternalCommandData, ByRef message As String, elements As ElementSet) As Result Dim app = commandData.Application Dim uidoc = commandData.Application.ActiveUIDocument Dim IntDoc = uidoc.Document Dim PB As BindingMap = IntDoc.ParameterBindings Dim PBM_FwdIt As DefinitionBindingMapIterator = PB.ForwardIterator PBM_FwdIt.Reset() While PBM_FwdIt.MoveNext = True Dim IDef As InternalDefinition = PBM_FwdIt.Key Dim Ty As String = "" If PBM_FwdIt.Current.GetType = GetType(InstanceBinding) Then Ty = "(Instance)" ElseIf PBM_FwdIt.Current.GetType = GetType(TypeBinding) Then Ty = "(Type)" End If Dim IdStr As String = "" Dim El As Element = IntDoc.GetElement(IDef.Id) If El.GetType = GetType(SharedParameterElement) Then Dim SPE As SharedParameterElement = El IdStr = SPE.GuidValue.ToString ElseIf El.GetType = GetType(ParameterElement) Then IdStr = CStr(IDef.Id.IntegerValue) End If Debug.WriteLine(IDef.Name & " " & IdStr & " " & Ty) End While Return Result.Succeeded End Function

Sample output:

rpt 610094 (Instance)

ProfileAngle e544d5d1-a0cb-490b-b276-d191cd8b1456 (Type)