Revit API：如何将 Revit 链接放入 Combobox

Question

I'm new to Revit API. And I can't see the Revit links from the Method in the ComboBox.

public static IList<Document> GetAllRevitLinkInstances(ExternalCommandData commandData)
{
    UIApplication uiapp = commandData.Application;
    UIDocument uidoc = uiapp.ActiveUIDocument;
    Document arDoc = uidoc.Document;
    FilteredElementCollector collector = new 
    FilteredElementCollector(arDoc);
    collector.OfClass(typeof(RevitLinkInstance)).ToList();
    IList<Document> linkedDocs = new List<Document>();
    foreach (Element elem in collector)
    {
        RevitLinkInstance instance = elem as RevitLinkInstance;
        Document linkDoc = instance.GetLinkDocument();
        linkedDocs.Add(linkDoc);
        // linkedDocs.Add(string.Format("{0}.rvt", 
        linkDoc.Title.ToString()));
        //linkedDocs.AppendLine("FileName: " + Path.GetFileName(linkDoc.PathName));
        //RevitLinkType type = arDoc.GetElement(instance.GetTypeId()) as RevitLinkType;
        //linkedDocs.AppendLine("Is Nested: " + type.IsNestedLink.ToString());
    }

    return linkedDocs;
}

In MVVM I use:

public Document SelectedLinkedInstances { get; set; }
public IList<Document> LinkedInstances { get; } = new List<Document>();

public MainViewViewModel(ExternalCommandData commandData)
{
    _commandData = commandData;
    SaveCommand = new DelegateCommand(OnSaveCommand);
    LinkedInstances = LinkUtils.GetAllRevitLinkInstances(commandData);
}

But in the ComboBox finally I see only empty lines. So, the docs are not seen in the ComboBox. May be someone faced the same problem? enter image description here

Answer 1

I think you may have two main issues. I've not seen .ToList() for the FilteredElementCollector class before, you probably want .ToElements() - that gives you an IList<Element> ToElements RevitAPIDocs

You also don't have the XAML (Assuming some things here) shown. Check to see that you're binding that list into the window correctly. I typically set the item source in the code so something simple like:

LinkedInstances = LinkUtils.GetAllRevitLinkInstances(commandData);    
LinkedDocsComboBox.Items = LinkedInstances;