/// <summary>
        /// 增加一条记录,返回新的ID号。需要有一个单一主键,并且开启有标识符属性(异步方式)
        /// </summary>
        /// <param name="entity">实体模型</param>
        /// <returns></returns>
        public virtual async Task <int> InsertAsync(DownServerEntity entity)
        {
            if (entity.ServerID <= 0)
            {
                entity.ServerID = GetNewID();
            }
            Dictionary <string, object> dict = new Dictionary <string, object>();

            GetParameters(entity, dict);

            string strSQL = "insert into DownServer (" +
                            "ServerID," +
                            "ServerName," +
                            "ServerUrl," +
                            "ServerLogo," +
                            "OrderSort," +
                            "ShowType) " +
                            "values(" +
                            "@ServerID," +
                            "@ServerName," +
                            "@ServerUrl," +
                            "@ServerLogo," +
                            "@OrderSort," +
                            "@ShowType)";

            if (await Task.Run(() => _DB.ExeSQLResult(strSQL, dict)))
            {
                return(DataConverter.CLng(entity.ServerID));
            }
            return(-1);
        }
        /// <summary>
        /// 增加一条记录
        /// </summary>
        /// <param name="entity">实体模型</param>
        /// <returns></returns>
        public virtual bool Add(DownServerEntity entity)
        {
            if (entity.ServerID <= 0)
            {
                entity.ServerID = GetNewID();
            }
            Dictionary <string, object> dict = new Dictionary <string, object>();

            GetParameters(entity, dict);

            string strSQL = "insert into DownServer (" +
                            "ServerID," +
                            "ServerName," +
                            "ServerUrl," +
                            "ServerLogo," +
                            "OrderSort," +
                            "ShowType) " +
                            "values(" +
                            "@ServerID," +
                            "@ServerName," +
                            "@ServerUrl," +
                            "@ServerLogo," +
                            "@OrderSort," +
                            "@ShowType)";

            return(_DB.ExeSQLResult(strSQL, dict));
        }
 /// <summary>
 /// 把实体类转换成键/值对集合
 /// </summary>
 /// <param name="entity"></param>
 /// <param name="dict"></param>
 private static void GetParameters(DownServerEntity entity, Dictionary <string, object> dict)
 {
     dict.Add("ServerID", entity.ServerID);
     dict.Add("ServerName", entity.ServerName);
     dict.Add("ServerUrl", entity.ServerUrl);
     dict.Add("ServerLogo", entity.ServerLogo);
     dict.Add("OrderSort", entity.OrderSort);
     dict.Add("ShowType", entity.ShowType);
 }
        /// <summary>
        /// 通过数据读取器生成实体类
        /// </summary>
        /// <param name="rdr"></param>
        /// <returns></returns>
        private static DownServerEntity GetEntityFromrdr(NullableDataReader rdr)
        {
            DownServerEntity info = new DownServerEntity();

            info.ServerID   = rdr.GetInt32("ServerID");
            info.ServerName = rdr.GetString("ServerName");
            info.ServerUrl  = rdr.GetString("ServerUrl");
            info.ServerLogo = rdr.GetString("ServerLogo");
            info.OrderSort  = rdr.GetInt32("OrderSort");
            info.ShowType   = rdr.GetInt32("ShowType");
            return(info);
        }
        /// <summary>
        /// 获取实体(异步方式)
        /// </summary>
        /// <param name="strWhere">参数化查询条件(例如: and Name = @Name )</param>
        /// <param name="dict">参数的名/值集合</param>
        /// <returns></returns>
        public virtual async Task <DownServerEntity> GetEntityAsync(string strWhere, Dictionary <string, object> dict = null)
        {
            DownServerEntity obj    = null;
            string           strSQL = "select top 1 * from DownServer where 1=1 " + strWhere;

            using (NullableDataReader reader = await Task.Run(() => _DB.GetDataReader(strSQL, dict)))
            {
                if (reader.Read())
                {
                    obj = GetEntityFromrdr(reader);
                }
            }
            return(obj);
        }
        /// <summary>
        /// 更新一条记录(异步方式)
        /// </summary>
        /// <param name="entity">实体模型</param>
        /// <returns></returns>
        public virtual async Task <bool> UpdateAsync(DownServerEntity entity)
        {
            Dictionary <string, object> dict = new Dictionary <string, object>();

            GetParameters(entity, dict);
            string strSQL = "Update DownServer SET " +
                            "ServerName = @ServerName," +
                            "ServerUrl = @ServerUrl," +
                            "ServerLogo = @ServerLogo," +
                            "OrderSort = @OrderSort," +
                            "ShowType = @ShowType" +
                            " WHERE " +

                            "ServerID = @ServerID";

            return(await Task.Run(() => _DB.ExeSQLResult(strSQL, dict)));
        }
 /// <summary>
 /// 增加或更新一条记录(异步方式)
 /// </summary>
 /// <param name="entity">实体模型</param>
 /// <param name="IsSave">是否增加</param>
 /// <returns></returns>
 public virtual async Task <bool> AddOrUpdateAsync(DownServerEntity entity, bool IsSave)
 {
     return(IsSave ? await AddAsync(entity) : await UpdateAsync(entity));
 }
 /// <summary>
 /// 增加或更新一条记录
 /// </summary>
 /// <param name="entity">实体模型</param>
 /// <param name="IsSave">是否增加</param>
 /// <returns></returns>
 public virtual bool AddOrUpdate(DownServerEntity entity, bool IsSave)
 {
     return(IsSave ? Add(entity) : Update(entity));
 }