topic Re: Accessing Revit 2016 Global Parameters in Revit API Forum

Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 15:03:52 GMT

Hello All,

I am working on a Revit 2016 program in which I'd like to access the value of a Global Parameter. From working in the API I understand the following things exist:

Autodesk.Revit.DB.GlobalParametersManager

Autodesk.Revit.DB.GlobalParameter

However, I haven't quite figured out how to employ these, and I can't seem to find any information about them in the SDK.

The current way I am trying to implement them is something like this:

//**********************************************************************

//***************************Start Here*********************************

ElementId globalParam1 = GlobalParametersManager.FindByName(doc, "Global Parameter 1");
if (globalParameter1 == null)
{
TaskDialog.Show("GP Error 1", "There was a problem finding Global Parameter 1.");

break;
}

Element gp1Element = doc.GetElement(globalParam1);
double gp1 = gp1Element.LookupParameter("Value").AsDouble();

//****************************Fin***************************************

//**********************************************************************

Any help on how to access these values or locations of some documentation containing info about using/accessing Global Parameters with the Revit API would be greatly appreciated!

Thanks In Advance,

Re: Accessing Revit 2016 Global Parameters

Anonymous — Mon, 25 Apr 2016 15:20:00 GMT

Try casting gp1Element to a GlobalParameter and then use the GlobalParameter.GetValue() method. There's a plethora of info in the main GlobalParameter class page in the API help.

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 16:04:10 GMT

Thanks for your quick reply, I have begun to implement your casting suggestion.... will post results!

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 17:56:16 GMT

*Edit* Also I was working with the 2016 SDK and not using R2 so I am currently updating to R2 2016 Revit SDK

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 18:31:23 GMT

Okay so I haven successfully cast it as a GlobalParameter and used the x.GetValue() command on it. The issue now is that it will not let me use the value as a double (the parameter value is a decimal value). I have tried to use both the "x.AsDouble()" and "x.AsValueString()" and they also do not work. When I output the "x.GetValue().ToString()" it does not tell me the parameter value, but only that it is "Autodesk.Revit.DB.DoubleParameterValue".

What am I missing?

Re: Accessing Revit 2016 Global Parameters

Anonymous — Mon, 25 Apr 2016 20:16:21 GMT

If you look at the DoubleParameterValue members there is a "Value" property. So it should be x.GetValue().Value and returns a double.

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 20:20:28 GMT

I have tried that and ".Value()" does not appear to be a valid method for ".GetValue()"

Re: Accessing Revit 2016 Global Parameters

Anonymous — Mon, 25 Apr 2016 20:22:16 GMT

Its a property. Not a method. So remove the parenthesis.

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Mon, 25 Apr 2016 20:25:07 GMT

It does not appear to work as either one.

Re: Accessing Revit 2016 Global Parameters

rhanzlick — Tue, 26 Apr 2016 18:30:18 GMT

***Final Update***

The final trick was casting from Element to GlobalParameter, then casting again from GlobalParameter to (your recommended) DoubleParameterValue (used with the x.GetValue() method).

Once it was cast as a DoubleParameterValue I was able to use your recommended x.GetValue().Value property, and it all worked out exactly as I'd hoped.
Thanks for your help, it is much appreciated!