Receiving list of hubs with Autodesk Forge API

Question

I am trying to use the Autodesk forge API for C# to get a list of Hubs. This is what I have done so far:

HubsApi api = new HubsApi();
Hubs hubs = api.GetHubs();

Pretty simple. But when I do so, I get an exception wicht complains, that one cannot convert from DynamicJsonResponse to Hubs. I think, this is because I receive two warnings in my response string and so it is not a Hub Object any longer. The warning looks like this:

"warnings":[  
        {  
           "Id":null,
           "HttpStatusCode":"403",
           "ErrorCode":"BIM360DM_ERROR",
           "Title":"Unable to get hubs from BIM360DM EMEA.",
           "Detail":"You don't have permission to access this API",
           "AboutLink":null,
           "Source":[  

           ],
           "meta":[  

           ]
        }

All of this is wrapped in an Dictionary with four entries and only two of them are data. However, according to Autodesk, this warning can be ignored.

So after that I tried to convert it in a Dictionary and only select the data entry

HubsApi api = new HubsApi();
DynamicJsonResponse resp = api.GetHubs();
DynamicDictionary hubs = (DynamicDictionary)resp.Dictionary["data"];

Then I looped through it:

for(int i = 0; i < hubs.Dictionary.Count && bim360hub == null; i++)
{
    string hub = hubs.Dictionary.ElementAt(i).ToString();
    [....]
}

But the string hub isn't an json-hub either. It is an array which looks like this:

[
  0,
  {
    "type": "hubs",
    "id": "****",
    "attributes": {...},
    "links": {...},
    "relationships": {...},
  }
]

And the second element in the array is my hub. I know, how I can select the second element. But there must be a much easier to get the list of hubs. In an example in the references it seemd to work with these simple two lines of code:

HubsApi api = new HubsApi();
Hubs hubs = api.GetHubs();

Any ideas, how I manage to get my hubs?

score 1 · Accepted Answer · answered Aug 03 '17 at 15:29

First, consider using the Async version of those methods, avoid using non-async calls as it causes your desktop app to freeze (while is connecting) or allocates more resources on ASP.NET.

The following function is part of this sample, which lists all hubs, projects and files under a user account. It's a good place to start. Note it's organizing the Hubs in a TreeNode list, which is compatible with jsTree.

private async Task<IList<TreeNode>> GetHubsAsync()
{
  IList<TreeNode> nodes = new List<TreeNode>();

  HubsApi hubsApi = new HubsApi();
  hubsApi.Configuration.AccessToken = AccessToken;

  var hubs = await hubsApi.GetHubsAsync();
  string urn = string.Empty;
  foreach (KeyValuePair<string, dynamic> hubInfo in new DynamicDictionaryItems(hubs.data))
  {
    string nodeType = "hubs";
    switch ((string)hubInfo.Value.attributes.extension.type)
    {
      case "hubs:autodesk.core:Hub":
        nodeType = "hubs";
        break;
      case "hubs:autodesk.a360:PersonalHub":
        nodeType = "personalhub";
        break;
      case "hubs:autodesk.bim360:Account":
        nodeType = "bim360hubs";
        break;
    }
    TreeNode hubNode = new TreeNode(hubInfo.Value.links.self.href, (nodeType == "bim360hubs" ? "BIM 360 Projects" : hubInfo.Value.attributes.name), nodeType, true);
    nodes.Add(hubNode);
  }

  return nodes;
}

Receiving list of hubs with Autodesk Forge API

1 Answers1