How To Find data by passing List of IMongoQuery - mongodb

Question

Below is my code where i am passing List showing no error during building solution but during run time its showing error.
An Array value cannot be written to the root level of a BSON document.
My Code Is :
public IQueryable<Folder> GetFolderByIdList(List<IMongoQuery> GraphIdList)
{
if (ApplicationDbContext.ServerIsDown) return null;
_FolderList.Clear();
if (!GraphIdList.Any())
{
return null;
}
var FolderData = db.Folder.Find(GraphIdList.ToBsonDocument()).ToList();
if (FolderData.Count() > 0)
{
foreach (Folder item in FolderData)
{
_FolderList.Add(item);
}
}
var result = _FolderList.AsQueryable();
return result;
}
and below is my code what i have pass in GraphIdList
var UserFilesData = planetDriveObj.GetFilesOfFolder(
Query.And(
Query<UserFiles>.EQ(u => u.CreatorUserID, userInfoId),
Query<UserFiles>.Matches(u => u.Title, fileTitle)));
foreach(var c in UserFilesData.ToList())
{
idList.Add(Query.And(
Query<Graph>.EQ(u => u.GraphID, c.GraphID),
Query<Graph>.EQ(u => u.isHidden, true)));
}
var GraphData = GraphRepObj.getGraphDataBYIdList(idList);