public async Task <List <string> > GetRevitFileVersionId(string projectId, string versionId, string userAccessToken) { string folderId = await GetFolderId(projectId, versionId, userAccessToken); FoldersApi folderApi = new FoldersApi(); folderApi.Configuration.AccessToken = userAccessToken; dynamic contents = await folderApi.SearchFolderContentsAsync( projectId, folderId, 0, new List <string>(new string[] { "rvt" })); if (contents.Data.included.Count == 0) { throw new Exception("No Revit file found in folder!"); } List <string> versionIds = new List <string>(); foreach (KeyValuePair <string, dynamic> includedItem in new DynamicDictionaryItems(contents.Data.included)) { if (includedItem.Value.attributes.hidden == false) { if (includedItem.Value.relationships.tip.data.type == "versions") { versionIds.Add(includedItem.Value.relationships.tip.data.id); } } } return(versionIds); }