MongoDatabase 数据访问助手类

/// <summary>     /// 数据访问助手类 //https://mongolab.com/login/ 远程MongoDb免费数据库     /// </summary>     public class MongoHelper : IDisposable     {         private MongoServer mongoServer = null;         private MongoDatabase mongoDatabase = null;         private readonly static string connectionString = "mongodb://fn2008:123456@127.0.0.1:41338/iclound";//"mongodb://steven9701:fn2008@ds041337.mongolab.com:41337/ertn2012";         private readonly static string databaseName = "iclound";//admin:admin fn2008 权限

        ~MongoHelper()         {             Dispose ();         }

        public MongoHelper()         {             if (string.IsNullOrEmpty(connectionString))             {                 throw new ArgumentNullException("connectionString");             }

            //var settings = new MongoServerSettings             //{             //    Server = new MongoServerAddress("127.0.0.1", 41338),             //    MaxConnectionPoolSize = 1000,                              //};

            //建立连接             mongoServer = MongoServer.Create(connectionString);             mongoServer.Connect();

            if (string.IsNullOrEmpty(databaseName) == false)             {                 //取得指定Database                 mongoDatabase = mongoServer.GetDatabase(databaseName);             }         }

        /// <summary>         /// 切换到指定的数据库         /// </summary>         /// <param name="dbName"></param>         /// <returns></returns>         public MongoDatabase ResetDatabase(string dbName)         {             if (string.IsNullOrEmpty(dbName))             {                 throw new ArgumentNullException(dbName);             }

            mongoDatabase = mongoServer.GetDatabase(dbName);             return mongoDatabase;         }

        /// <summary>         /// 获取当前连接的数据库         /// </summary>         public MongoDatabase MongoDatabase         {             get             {                 if (mongoDatabase == null)                 {                     throw new Exception("当前连接没有指定任何数据库。请在构造函数中指定数据库名或者调用ResetDatabase()方法切换数据库。");                 }

                return mongoDatabase;             }         }

        /// <summary>         /// 获取当前连接数据库的指定集合         /// </summary>         /// <typeparam name="T"></typeparam>         /// <returns></returns>         public MongoCollection<T> GetCollection<T>(string collectionName) where T : class         {             return this.MongoDatabase.GetCollection<T>(collectionName);         }

        /// <summary>         /// 获取当前连接数据库的指定集合         /// </summary>         /// <typeparam name="T"></typeparam>         /// <returns></returns>         public MongoCollection<T> GetCollection<T>(string collectionName,SafeMode safeMode) where T : class         {             return this.MongoDatabase.GetCollection<T>(collectionName, safeMode);         }

        /// <summary>         /// 获取当前连接数据库的指定集合         /// </summary>         /// <typeparam name="T"></typeparam>         /// <returns></returns>         public MongoCollection<T> GetCollection<T>(MongoCollectionSettings<T> mongoCollectionSettings) where T : class         {             return this.MongoDatabase.GetCollection<T>(mongoCollectionSettings);         }

        public void Dispose()         {             if (mongoServer != null)             {                 mongoServer = null;             }         }     }