BrowserNode.Expanded = True throws an exception

[Anton_Chernomazov]

I'm using C# Inventor AddIn to search an BrowserNode object in BrowserPane and execute some command. When I have target BrowserNode I try to set Expanded propery value as True. But in this case an exception occurs. How to expand BrowserNode?

[JelteDeJong]

I did a small test. This is my test code and it works like expected.

PartDocument doc = (PartDocument)ThisDoc.Document;
BrowserNode node = doc.BrowserPanes["Model"].TopNode;

BrowserNode childNode = node.BrowserNodes[1];
childNode.Expanded = true;

 Can you share a bit more of your code and/or the node that you are trying to expand?

[Anton_Chernomazov]

This case work for me too. But if I take browser node for drawing view on drawing document and try to expand it I have an exception. 

[JelteDeJong]

I changed my test setup to this code and it still works.

DrawingDocument doc = (DrawingDocument)ThisDoc.Document;
BrowserNode node = doc.BrowserPanes["Model"].TopNode;

BrowserNode sheetNode = node.BrowserNodes[2];

BrowserNode baseDrawingViewNode = sheetNode.BrowserNodes[3];
baseDrawingViewNode.Expanded = true;

BrowserNode projectedDrawingViewNode = sheetNode.BrowserNodes[3];
projectedDrawingViewNode.Expanded = true;

[Anton_Chernomazov]

Thank you for reply. I think your case works because you use indexator BrowserNode[object index] to get target node. But I use BrowserPane.GetBrowserNodeFromObject method for DrawingView