MongoDB代码实例1， 增加用户余额

            var client = new MongoClient("mongodb://192.168.11.137:27019");

            var session = client.StartSession();
            session.StartTransaction();


            var database = client.GetDatabase("MyTestDB2");
            var collection = database.GetCollection<UserInfo>("UserInfo");


            var update = new UpdateDefinitionBuilder<UserInfo>()
                .Inc(m => m.Balance, 100);//余额增加100

            var option = new FindOneAndUpdateOptions<UserInfo, UserInfo>();
            option.ReturnDocument = ReturnDocument.After;//返回更新后对象

try
                {
                    var dataitem = collection.FindOneAndUpdate<UserInfo>(session, m => m.Name == "JackTan", update, option);
                    
                }
                catch (MongoCommandException ex)
                {
                    //if (ex.Code == 112)  其他事务正在修改这个文档
                    
                    throw;
                }
            
           

            session.CommitTransaction();