How to set IFC classes in Revit IFC export in C# (Dynamo ZeroTouch)

[Anonymous]

How can change the txt-file in Export > Options > IFC Options?
Currently I can only "get" the file and I see no "set" property.

[CTCDev]

Do you mean the mapping file?

Should be this:

IFCExportOptions options = new IFCExportOptions();

options.FamilyMappingFile = fileName;

document.Export(outputFolder, shortFileName, options);

There are other useful properties on the options object as well.

.

[Anonymous]

Thank you. It works, but why is the same table caled ExportIFCCategoryTable and FamilyMappingFile? I get en error if the file do not start with "exportlayers". How come? I see no rulesabout  naming i the help file.