M

Document.SetDefaultFamilyTypeId

Description:
Sets the default family type id for the given family category.

public void SetDefaultFamilyTypeId(
	ElementId familyCategoryId,
	ElementId familyTypeId
)

Public Sub SetDefaultFamilyTypeId ( _
	familyCategoryId As ElementId, _
	familyTypeId As ElementId _
)

public:
void SetDefaultFamilyTypeId(
	ElementId^ familyCategoryId, 
	ElementId^ familyTypeId
)

Autodesk.Revit.DB.ElementId

familyCategoryId

The family category id.
Autodesk.Revit.DB.ElementId

familyTypeId

The default family type id.

private void SetDefaultTypeFromDoor(Document document, FamilyInstance door)
{
    ElementId doorCategoryId = new ElementId(BuiltInCategory.OST_Doors);

    // It is necessary to test the type suitability to be a default family type, for not every type can be set as default. 
    // Trying to set a non-qualifying default type will cause an exception
    if (door.Symbol.IsValidDefaultFamilyType(doorCategoryId))
    {
        document.SetDefaultFamilyTypeId(doorCategoryId, door.Symbol.Id);
    }
}

Private Sub SetDefaultTypeFromDoor(document As Document, door As FamilyInstance)
   Dim doorCategoryId As New ElementId(BuiltInCategory.OST_Doors)

   ' It is necessary to test the type suitability to be a default family type, for not every type can be set as default. 
   ' Trying to set a non-qualifying default type will cause an exception
   If door.Symbol.IsValidDefaultFamilyType(doorCategoryId) Then
      document.SetDefaultFamilyTypeId(doorCategoryId, door.Symbol.Id)
   End If
End Sub

Autodesk.Revit.Exceptions.ArgumentException

The family type id familyTypeId is invalid for the give family category familyCategoryId.
Autodesk.Revit.Exceptions.ArgumentNullException

A non-optional argument was null