Mongo Connection Exception handling

Question

I am trying to make some exception handling on the following code. Basically I want a MessageBox.Show("ErrorMessage") to show if the connection to the server can't be established.

public List<MongoDBModel> MongoDBModel
        {
            get
            {
                string connectionString = "mongodb://127.0.0.1";
                var mongoClient = new MongoClient(connectionString);
                var mongoServer = mongoClient.GetServer();
                var databaseName = "TestPointToPoint";
                var db = mongoServer.GetDatabase(databaseName);
                var mongodb = db.GetCollection<MongoDBModel>("OCS.MeterEntity");
                var mongodbQuery = Query<MongoDBModel>.EQ(x => x._id, MeterUID);
                List<MongoDBModel> Cursor = mongodb.FindAs<MongoDBModel>(mongodbQuery).ToList();
                return Cursor;

            }
        }

I have already tryed with

    if (mongoServer.State == MongoServerState.Connected)
    {
              var databaseName = "TestPointToPoint";
              var db = mongoServer.GetDatabase(databaseName);
              var mongodb = db.GetCollection<MongoDBModel>("OCS.MeterEntity");
              var mongodbQuery = Query<MongoDBModel>.EQ(x => x._id, MeterUID);
              List<MongoDBModel> Cursor = mongodb.FindAs<MongoDBModel>(mongodbQuery).ToList();
              return Cursor;
    }
    else
    {
              MessageBox.Show("Connection to MongoDB lost");
              return null;
    }

but that did not work since the state of the mongoServer first changes to connected in the query.

What should I do to make it work?

Answer 1

I feel stupid now :P Using a simple try-catch worked.

public List<MongoDBModel> MongoDBModel
    {
        get
        {
            string connectionString = "mongodb://127.0.0.1";
            var mongoClient = new MongoClient(connectionString);
            var mongoServer = mongoClient.GetServer();
            var databaseName = "TestPointToPoint";
            var db = mongoServer.GetDatabase(databaseName);
            var mongodb = db.GetCollection<MongoDBModel>("OCS.MeterEntity");
            try
            {
                var mongodbQuery = Query<MongoDBModel>.EQ(x => x._id, MeterUID);
                List<MongoDBModel> Cursor = mongodb.FindAs<MongoDBModel>(mongodbQuery).ToList();
                return Cursor;
            }
            catch (MongoConnectionException e)
            {
                MessageBox.Show(e.Message);
                return null;
            }
        }
    }

Sorry for your troubles.