Return Revit Model linked to a project

[pmcmm1]

Dear colleagues,

I'd be surprised if this question hasn't been answered yet in this forum. Yet, I wasn't able to find the exact answer to what I'm looking for. So, in first place, excuse the redundancy if that's the case.

I want to obtain the linked revit models that are linked to an open document. I've used the following line

DocumentSet docs = commandData.Application.ActiveUIDocument.Document.Application.Documents;

to retrieve a DocumentSet containing all the documents open in revit. Then I iterated through the documents and used the Property doc.IsLinked to check if that document is linked.

However, if I have two models open in revit and both have linked models, my code will return the linked models of both files. How can I make sure that only linked files from my document get returned?

[jeremytammik · Accepted solution]

Install RevitLookup. Look at the database contents. In the document containing links, you will see RevitLinkInstance entries representing the linked files. You can retrieve all those entries using a filtered element collector. 

[pmcmm1]

Thank you once again Jeremy. For reference, this is the little function I wrote to retrieve all linked documents

public static List<Document> GetLinkedDocuments(Document doc)
        {
            var fc = new FilteredElementCollector(doc)
                .OfCategory(BuiltInCategory.OST_RvtLinks)
                .WhereElementIsNotElementType();

            var list_docs = new List<Document>();
            foreach (var elem in fc)
            {
                RevitLinkInstance link = (RevitLinkInstance)elem;
                Document link_doc = link.GetLinkDocument();
                list_docs.Add(link_doc);
            }

            return list_docs;

[jeremytammik]

Cool. 

Thank you for your appreciation.

Here is a slightly more succinct and efficient version that does not construct a new List object:

    IEnumerable<Document> GetLinkedDocuments(
      Document doc )
    {
      return new FilteredElementCollector( doc )
        .OfCategory( BuiltInCategory.OST_RvtLinks )
        .WhereElementIsNotElementType()
        .Cast<RevitLinkInstance>()
        .Select<RevitLinkInstance, Document>( 
          link => link.GetLinkDocument() );
    }

I also added it to The Building Coder samples for future reference.

Can you confirm that it works as well, please?

Thank you!

Cheers,

Jeremy