How to tail the mongodb oplog in C# ?

TailOplog

 public void GetLastEntryInOpLog()
        {
            BsonValue lastId = BsonMinKey.Value;

            var query = Query.GT("ts", lastId.AsBsonMinKey);
            var cursor = OpLogHandler.MongoCollection.FindAs<BsonDocument>(query)
                                    .SetFlags(QueryFlags.TailableCursor | QueryFlags.AwaitData | QueryFlags.NoCursorTimeout)
                                    .SetSortOrder(SortBy.Ascending("$natural"));
            
            using (var enumerator = cursor.GetEnumerator())
            {
                    while (enumerator.MoveNext())
                    {
                        var document = enumerator.Current;
                        lastId = document["ts"] as BsonTimestamp;
                        Console.WriteLine(string.Format("LastId Is {0}", lastId));
                        Console.WriteLine(document);                        
                    }
            }            
        }

what is OpLogHandler?

For the latest version please of MongoDriver 2.0 and above and for Mongo 3.0 version there is a new method.

Please go through this documentation example.
Note there is an error in this method, to fix it please replace the "lastId" with "lastValue". otherwise it perfect.

http://mongodb.github.io/mongo-csharp-driver/2.0/examples/tailable_cursor/