topic Re: Get Parameter Values from Room in Revit API Forum

Get Parameter Values from Room

Kevin.Bell — Tue, 16 Aug 2016 08:09:10 GMT

Hi,

I'm moving from Python to C# and am trying to convert my plugin which obtains data from Room objects.

In Python I can obtain a rooms Number with the following method:

Create a FilteredElementCollector of all rooms and then convert to Eleemnts, then loop through the elements list with the variable f:

paramsnum = f.GetParameters('Number')

This returns the Number parameter value in the variable paramsnum.

This works fine, but I'm struggling to do this in c#:

            //Get all rooms
            FilteredElementCollector allrooms = new FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Rooms);

            //Convert room list to elements
            ICollection<Element> allroomelements = allrooms.ToElements();

            // Create list of room numbers (from Number parameter)
            List<string> numslist = new List<string>();

            foreach (Element f in allroomelements)
            {
                Debug.Print(f.Name);
                IList<Parameter> paramsnum = f.GetParameters("Number");
            }

This executes, but paramsnum is not a string I can use, I cannot obtain the value from an IList.

Where am I going wrong?

Thanks.

Re: Get Parameter Values from Room

jeremytammik — Tue, 16 Aug 2016 14:07:32 GMT

Dear Archie.

I would strongly recommend you start off working through the .NET C# Revit API getting started material before doing anything else at all, especially the DevTV and My First Revit Plugin tutorials:

http://thebuildingcoder.typepad.com/blog/about-the-author.html#2

That will immediately answer your question and many more, saving both you and the rest of the world lots of time and effort.

Thank you!

Cheers,

Jeremy

Re: Get Parameter Values from Room

joshua.lumley — Sat, 05 Nov 2016 03:41:29 GMT

How do you check of a parameter exists?

The below code does not work on : OST_Views, OST_Room & OST_DetailComponents


 if (null !=  doc2.GetElement(doc2.GetElement(id).GetTypeId()).GetParameters("Family Name"))

It keeps coming up with an error message, and I have tried.

 if (0 !=  doc2.GetElement(doc2.GetElement(id).GetTypeId()).GetParameters("Family Name").Count)

Re: Get Parameter Values from Room

Anonymous — Sun, 06 Nov 2016 03:01:51 GMT

You should be able to do it like this:

            ICollection<Element> allRooms = new FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Rooms).ToElements();
            List<string> roomNumbers = allRooms.Select(x => ((Room)x).Number).ToList();

Few key things to keep in mind here are the differences between Python and C#. C# is strong typed and doesn't fare well with unknown types. Python doesn't have that "issue" since it just tries all possible overloads. C# was meant to be a little more efficient and wants you to define a type that you are working with. What I am getting at here, is that where's you can just do FilteredElementCollector query in Python and then ask returned elements for a Number, you can't do that with C# before you cast Element to Room.

Give it a try.