How to add material to family symbols through .NET API?

Hi,

I try to set material to family symbols through .NET API.

Is there a simple way to set material to FamilyInstance or Symbo?

I´m not yet familiar with Family API with materials so this may be a frustrating question.



What I´m going to do is described below.

1. Load multible rfa -files to one family template rfa -file.

2. Insert one familysymbol from each rfa -file to main family template rfa -file.

3. Set different materials to each family symbols in main family template file. (I don´t know is this possible)

4. Save main rfa -file.

Cheers

Veli V.

Example try out code below.

Using famItemCreator As Autodesk.Revit.Creation.FamilyItemFactory = doc.FamilyCreate
                    For Each mfpItem As MartelaFamilyParam In colMartelaFamilyParams
                        If Not doc.LoadFamily(mfpItem.rfaFile, fam) Then Continue For
                        If fam Is Nothing Then Continue For

                        familySymbolIds = CType(fam.GetFamilySymbolIds, System.Collections.Generic.ISet(Of ElementId))
                        If familySymbolIds Is Nothing Then Continue For
                        If familySymbolIds.Count > 0 Then
                            If familySymbolIds.Count > 1 Then
                                DisplayRevitMessage("Family " + fam.Name + " have more that 1 symbols.", "We add the first one: " + doc.GetElement(familySymbolIds(0)).Name)
                            End If
                            fs = CType(doc.GetElement(familySymbolIds(0)), FamilySymbol)
                            If Not fs.IsActive Then fs.Activate() : doc.Regenerate()
                            If Not fs Is Nothing Then
                                famInstance = famItemCreator.NewFamilyInstance(New XYZ(mfpItem.x, mfpItem.y, mfpItem.z), fs, lvl, [Structure].StructuralType.NonStructural)
                                'Try to get/set material
                                For Each matItemId As ElementId In famInstance.GetMaterialIds(False)
                                    Debug.WriteLine(doc.GetElement(matItemId).Name)
                                Next matItemId
                                'famInstance.LookupParameter("Martela Material 1").Set(newMat.Id)
                                'Dim paramMat As Parameter = famInstance.LookupParameter("Martela Material 1")
                                'doc.FamilyManager.AssociateElementParameterToFamilyParameter(paramMat, famParam1) 
                            End If
                        End If
                        familySymbolIds.Clear()
                        familySymbolIds = Nothing
                        If Not fs Is Nothing Then fs.Dispose() : fs = Nothing
                        If Not fam Is Nothing Then fam.Dispose() : fam = Nothing
                        'If Not famInstance Is Nothing Then famInstance.Dispose() : famInstance = Nothing
                    Next mfpItem