Hoe to get the value inside the parameters that are not BuiltIn parameters

[mahshid.motie]

Hi,

I have created the parameter "Instance_Name" for all of the elements in my project and its has value in some of the elements and its empty in the rest. I want to check the value of the parameter but I dont know how to access it. Using revitlookup I found out that it exists in parameters. I have tried different methods like:

IList<Parameter> p = EF.GetParameters("Instance_Name");
string pp = p[0].ToString();
Parameter ppp = EF.LookupParameter(pp);
string pppp = ppp.AsString();
TaskDialog.Show("instance name", pppp);

or 

Parameter p = EF.LookupParameter("Instance_Name");
string pp = p.AsString();
TaskDialog.Show("instance name", pp);

Can you help me?

[jeremytammik · Accepted solution]

This question has been answered many times over elsewhere.

Your second code snippet is fine, with some caveats: avoid using the display name if possible, and it only works of you can guarantee that there is only one parameter with this display name. GetParameters returns all parameters with a given display name. get_Parameter also takes a GUID, if your parameter is a shared parameter.

https://thebuildingcoder.typepad.com/blog/2015/02/family-instance-area-and-auto-loading-a-project-fi...

https://thebuildingcoder.typepad.com/blog/2015/06/cnc-direct-export-wall-parts-to-dxf-and-sat.html#2...

[mahshid.motie]

Thanks for the answer Jeremy 🙂