Exporting IFC for linked documents

[chris.inv]

I am trying to use revit api to automate exporting IFC files. The revit model contains links to other revit models and each linked model has to be exported as a separate IFC file.

Using Revit 2014 API, I am able to get the linked document objects but here is the problem. The API to export IFC document requires that a transaction is open, but a transaction cannot be opened for linked documents. Is there a way to do this?

Example code:

FilteredElementCollector collector = new FilteredElementCollector(document);
collector.OfClass(typeof(RevitLinkInstance));

foreach (Element elem in collector)
{
  RevitLinkInstance instance = elem as RevitLinkInstance;
  Document linkDoc = instance.GetLinkDocument();
  Transaction trans = new Transaction(linkDoc , "export");
  trans.Start();   // this will fail
  linkDoc.Export(...);
  trans.Rollback();
}

[gopinath.taget]

Hello,

I did some research but could not find a lot of information on exporting linked documents but I wonder if you can get away with creating a transaction associated with the open document and then perform the export of the linked document. Can you please try this?

Thanks

Gopinath

[chris.inv]

Thanks for your answer. But that did not work. The document.Export() call needs an open transaction on the document object.

[R.van.den.Bor · Accepted solution]

i did it like this.

First get a list of all links in the main document.

I order to open a link, you need to close the main document. But since you can't work in a zero document state, I open a dummy file.

So loop over the found linked files :

foreach(link ll in ListOfLinekdFIles)

{

Document OldCoc = _commData.Application.ActiveUIDocument.Document;
CurrDocument = _commData.Application.OpenAndActivateDocument(@"D:\Misc\RVTLink_dummy.rfa");
OldCoc.Close(false);

CurrDocument = _commData.Application.OpenAndActivateDocument(ll);

IFCExportOptions ifcOptions = new IFCExportOptions();
ifcOptions.FileVersion = IFCVersion.IFC2x3;
CurrDocument.Export(ProjectLocation, _filenaam, ifcOptions);

}

hope this helps, good luck

[chris.inv]

Good idea. Thanks!