EF DataTable扩展,Excel导出扩展,stackexchange.redis帮助类,ServiceStack.Redis帮助类/netCore Session 扩展

常用的帮助类和相关扩展函数·mark一下，用到时直接Copy

EF TO DataTable:

    public static class EFExtendMethod
    {
        public static DataTable SqlQueryToDataTable(this Database db, string sql, CommandType type = CommandType.Text, params SqlParameter[] param)
        {
            DataTable ret_dt = new DataTable();
            SqlConnection conn = db.Connection as SqlConnection;
            if (conn == null)
            {
                conn = new SqlConnection(db.Connection.ConnectionString);
            }

            if (conn.State != ConnectionState.Open)
            {
                conn.Open();
            }

            try
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                cmd.CommandType = type;

                if (param != null && param.Length > 0)
                {
                    foreach (SqlParameter p in param)
                    {
                        cmd.Parameters.Add(p);
                    }
                }

                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                adapter.Fill(ret_dt);

                conn.Close();
                return ret_dt;
            }
            catch (Exception ex)
            {
                conn.Close();
                return ret_dt;
            }
        }

        public static DataTable SqlQueryToDataTable(this Database db, string sql, params SqlParameter[] param)
        {
            return SqlQueryToDataTable(db,sql,CommandType.Text,param);
        }
    }

　　DataTable Excel 导出：

    public static class CSVFileHelper
    {

        public static string ToHtmlTable(this DataTable target)
        {
            return DataTableToHtmlTable(target);
        }

        public static string ToRootExcelFile(this DataTable target,string _fileName)
        {
            return SaveDataTableToRootExcelFile(_fileName, target);
        }


        public static string DataTableToHtmlTable(DataTable sourceData)
        {
            //
            var sbHtml = new StringBuilder();
            sbHtml.Append("<table border='1' cellspacing='0' cellpadding='0'>");

            sbHtml.Append("<tr>");
            DataColumnCollection columns = sourceData.Columns;
            foreach (DataColumn col in columns)
            {
                sbHtml.AppendFormat("<td style='font-size: 14px;text-align:center;background-color: #DCE0E2; font-weight:bold;' height='25'>{0}</td>", col.ColumnName);
            }
            sbHtml.Append("</tr>");

            foreach (DataRow row in sourceData.Rows)
            {
                sbHtml.Append("<tr>");
                foreach (DataColumn col in columns)
                {
                    sbHtml.AppendFormat("<td style='font-size: 12px;height:20px;'>{0}</td>", row[col]);
                }
                sbHtml.Append("</tr>");
            }
            sbHtml.Append("</table>");
            return sbHtml.ToString();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="_fileName"></param>
        /// <param name="sourceData"></param>
        /// <returns></returns>
        public static string SaveDataTableToRootExcelFile(string _fileName,DataTable sourceData)
        {
            string FileName = _fileName;
            string dir = HttpRuntime.AppDomainAppPath.ToString() + "/SaveExcelFile/";

            FileName = dir + FileName;

            if (!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }

            int numWriter = 1000;
            int numRecord = sourceData.Rows.Count;

            var sbHtml = new StringBuilder();
            sbHtml.Append("<table border='1' cellspacing='0' cellpadding='0'>");

            sbHtml.Append("<tr>");
            DataColumnCollection columns = sourceData.Columns;
            foreach (DataColumn col in columns)
            {
                sbHtml.AppendFormat("<td style='font-size: 14px;text-align:center;background-color: #DCE0E2; font-weight:bold;' height='25'>{0}</td>", col.ColumnName);
            }
            sbHtml.Append("</tr>");


            using (FileStream fs = File.Open(FileName, FileMode.CreateNew, FileAccess.Write))
            {
                using (StreamWriter sw = new StreamWriter(fs))
                {
                    try
                    {
                        sw.Write(sbHtml.ToString());

                        sbHtml.Clear();

                        int i = 0;
                        foreach (DataRow row in sourceData.Rows)
                        {

                            sbHtml.Append("<tr>");
                            foreach (DataColumn col in columns)
                            {
                                sbHtml.AppendFormat("<td style='font-size: 12px;height:20px;'>{0}</td>", row[col]);
                            }
                            sbHtml.Append("</tr>");
                            i++;

                            if (i == 1000)
                            {
                                i = 0;
                                sw.Write(sbHtml.ToString());
                                sbHtml.Clear();
                            }
                        }
                        sw.Write("</table>");
                        sw.Close();
                        fs.Close();
                    }
                    catch (Exception ex)
                    {
                        sw.Close();
                        fs.Close();
                    }
                }
            }

            return FileName;
        }

        /// <summary>
        /// 将DataTable中数据写入到CSV文件中
        /// </summary>
        /// <param name="dt">提供保存数据的DataTable</param>
        /// <param name="fullPath">CSV的文件路径</param>
        public static void SaveCSV(DataTable dt, string fullPath)
        {
            FileInfo fi = new FileInfo(fullPath);
            if (!fi.Directory.Exists)
            {
                fi.Directory.Create();
            }
            FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
            string data = "";
            //写出列名称
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                data += dt.Columns[i].ColumnName.ToString();
                if (i < dt.Columns.Count - 1)
                {
                    data += ",";
                }
            }
            sw.WriteLine(data);
            //写出各行数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                data = "";
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    string str = dt.Rows[i][j].ToString();
                    str = str.Replace(""", """");//替换英文冒号 英文冒号需要换成两个冒号
                    if (str.Contains(',') || str.Contains('"')
                        || str.Contains('
') || str.Contains('
')) //含逗号 冒号 换行符的需要放到引号中
                    {
                        str = string.Format(""{0}"", str);
                    }

                    data += str;
                    if (j < dt.Columns.Count - 1)
                    {
                        data += ",";
                    }
                }
                sw.WriteLine(data);
            }
            sw.Close();
            fs.Close();
        }

        /// <summary>
        /// 将CSV文件的数据读取到DataTable中
        /// </summary>
        /// <param name="filePath">CSV文件路径</param>
        /// <returns>返回读取了CSV数据的DataTable</returns>
        public static DataTable OpenCSV(string filePath)
        {
            Encoding encoding = Encoding.GetEncoding("GB2312");
            DataTable dt = new DataTable();
            FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);

            StreamReader sr = new StreamReader(fs, encoding);
            //记录每次读取的一行记录
            string strLine = "";
            //记录每行记录中的各字段内容
            string[] aryLine = null;
            string[] tableHead = null;
            //标示列数
            int columnCount = 0;
            //标示是否是读取的第一行
            bool IsFirst = true;
            //逐行读取CSV中的数据
            while ((strLine = sr.ReadLine()) != null)
            {

                if (IsFirst == true)
                {
                    tableHead = strLine.Split(',');
                    IsFirst = false;
                    columnCount = tableHead.Length;
                    //创建列
                    for (int i = 0; i < columnCount; i++)
                    {
                        DataColumn dc = new DataColumn(tableHead[i]);
                        dt.Columns.Add(dc);
                    }
                }
                else
                {
                    aryLine = strLine.Split(',');
                    DataRow dr = dt.NewRow();
                    for (int j = 0; j < columnCount; j++)
                    {
                        dr[j] = aryLine[j];
                    }
                    dt.Rows.Add(dr);
                }
            }
            if (aryLine != null && aryLine.Length > 0)
            {
                dt.DefaultView.Sort = tableHead[0] + " " + "asc";
            }

            sr.Close();
            fs.Close();
            return dt;
        }
    }

stackexchange.redis 帮助类

    public class RedisExChangeHelper : IDisposable
    {
        private ConnectionMultiplexer RedisMgr = null;
        public IDatabase Redis { get; private set; }

        static string RedisIPAddress = "127.0.0.1:6379";

        //默认缓存过期时间单位秒
        public int secondsTimeOut = 20 * 60;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="RedisAddressList"></param>
        /// <param name="Password"></param>
        /// <param name="DbIndex"></param>

        public RedisExChangeHelper(int DbIndex = -1)
        {
            RedisMgr = ConnectionMultiplexer.Connect(RedisIPAddress);

            Redis = RedisMgr.GetDatabase(DbIndex);
        }

        public RedisExChangeHelper(IList<string> RedisAddressList = null, string Password = "", int DbIndex = -1)
        {
            ConfigurationOptions opt = new ConfigurationOptions
            {
                CommandMap = CommandMap.Create(new HashSet<string>
                {
                    "INFO", "CONFIG", "CLUSTER",
                    "PING", "ECHO", "CLIENT"
                }, available: false),
                KeepAlive = 120
            };

            if (RedisAddressList == null )
            {
                RedisAddressList.Add("127.0.0.1:6379");
            }

            if (!string.IsNullOrEmpty(Password))
            {
                opt.Password = Password;
            }


            foreach (var item in RedisAddressList)
            {
                opt.EndPoints.Add(item);
            }

            RedisMgr = ConnectionMultiplexer.Connect(opt);

            Redis = RedisMgr.GetDatabase(DbIndex);
        }

        /// <summary>
        /// 切换当前DB
        /// </summary>
        /// <param name="Index"></param>
        /// <returns></returns>
        public bool SwitchDB(int Index)
        {
            IDatabase _redis = RedisMgr.GetDatabase(Index);
            if (_redis != null)
            {
                Redis = _redis;
                return true;
            }
            else
            {
                return false;
            }

        }

        /// <summary>
        /// 距离过期时间还有多少时间
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public TimeSpan TTL(string key)
        {
            return Redis.KeyTimeToLive(key).Value;
        }
        /// <summary>
        /// 设置过期时间(秒)
        /// </summary>
        /// <param name="key"></param>
        /// <param name="timeout">秒</param>
        public void Expire(string key, int timeout = 0)
        {
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    secondsTimeOut = timeout;
                }

                var timespan = TTL(key).Add(new TimeSpan(0,0, timeout));
                Redis.KeyExpire(key, timespan);
            }
        }

        /// <summary>
        /// 设置过期时间
        /// </summary>
        /// <param name="key"></param>
        /// <param name="timeout"></param>
        public void Expire(string key, TimeSpan timeout)
        {
            if (timeout.TotalMilliseconds >= 0)
            {
                if (timeout.TotalMilliseconds > 0)
                {
                    secondsTimeOut = (int)timeout.TotalMilliseconds;
                }

                Redis.KeyExpire(key, timeout);
            }
        }


        #region Key/Value存储

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key">缓存建</param>
        /// <param name="value">缓存值</param>
        /// <param name="timeout">过期时间，单位秒,-1：不过期，0：默认过期时间</param>
        /// <returns></returns>
        public bool Set(string key, string value, int timeout = 0)
        {
            int def_time = secondsTimeOut;
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    def_time = timeout;
                }
            }

            TimeSpan timespan = new TimeSpan(0, 0, def_time);
            return Redis.StringSet(key, value, timespan);
        }

        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="timeout"></param>
        /// <returns></returns>
        public Task<bool> SetAsync(string key, string value, int timeout = 0)
        {
            int def_time = secondsTimeOut;
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    def_time = timeout;
                }
            }

            TimeSpan timespan = new TimeSpan(0, 0, def_time);
            return Redis.StringSetAsync(key, value, timespan);
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key">缓存建</param>
        /// <param name="t">缓存值</param>
        /// <param name="timeout">过期时间，单位秒,-1：不过期，0：默认过期时间</param>
        /// <returns></returns>
        public bool Set<T>(string key, T value, int timeout = 0)
        {
            int def_time = secondsTimeOut;
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    def_time = timeout;
                }
            }

            string val_json = JsonConvert.SerializeObject(value);
            TimeSpan timespan = new TimeSpan(0, 0, def_time);
            return Redis.StringSet(key,val_json, timespan);
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="key"></param>
        /// <param name="sec"></param>
        /// <param name="value"></param>
        public void SetEX(string key, int sec, string value)
        {
            SetEX<string>(key, sec, value);
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="sec"></param>
        /// <param name="value"></param>
        public void SetEX<T>(string key,int sec, T value)
        {
            TimeSpan timespan = new TimeSpan(0, 0, sec);

            var str = JsonConvert.SerializeObject(value);

            Redis.StringSet(key, str, timespan);
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">建</param>
        /// <returns></returns>
        public string Get(string key)
        {
            string data = Redis.StringGet(key);
            return data;
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public T Get<T>(string key)
        {
            string data = Redis.StringGet(key);
            if (data != null)
            {
                return JsonConvert.DeserializeObject<T>(data);
            }

            return default(T);
        }
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool Remove(string key)
        {
            return Redis.KeyDelete(key);
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public Task<bool> RemoveAsync(string key)
        {
            return Redis.KeyDeleteAsync(key);
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool Delete(string key)
        {
            return Redis.KeyDelete(key);
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public Task<bool> DeleteAsync(string key)
        {
            return Redis.KeyDeleteAsync(key);
        }

        #endregion

        //释放资源
        public void Dispose()
        {
            if (RedisMgr != null)
            {
                RedisMgr.Close();
            }
            if (Redis != null)
            {
                Redis = null;
            }
            GC.Collect();
        }
    }

ServiceStack.Redis 帮助类

   public class RedisHelper : IDisposable
    {
        private RedisClient Redis = new RedisClient(RedisIPAddress);

        //缓存池
        PooledRedisClientManager prcm = new PooledRedisClientManager();

        static string RedisIPAddress = "127.0.0.1:6379";
        static string RedisPassport = "";
        static string RedisPassword = "";

        /// <summary>
        /// 这里根据情况自己编写初始化
        /// </summary>
        static public void Init()
        {
            RedisIPAddress = ConfigurationManager.AppSettings["RedisIPAddress"];
            RedisPassport = ConfigurationManager.AppSettings["RedisPassport"];
            RedisPassword = ConfigurationManager.AppSettings["RedisPassword"];
        } 

        //默认缓存过期时间单位秒
        public int secondsTimeOut = 20 * 60;

        public RedisHelper(bool OpenPooledRedis = false)
        {

            if (OpenPooledRedis)
            {
                prcm = CreateManager(new string[] { RedisIPAddress }, new string[] { RedisIPAddress });
                Redis = prcm.GetClient() as RedisClient;
            }
        }

        /// <summary>
        /// 缓冲池
        /// </summary>
        /// <param name="readWriteHosts"></param>
        /// <param name="readOnlyHosts"></param>
        /// <returns></returns>
        public static PooledRedisClientManager CreateManager(string[] readWriteHosts, string[] readOnlyHosts)
        {
            return new PooledRedisClientManager(readWriteHosts, readOnlyHosts,
                new RedisClientManagerConfig
                {
                    MaxWritePoolSize = readWriteHosts.Length * 5,
                    MaxReadPoolSize = readOnlyHosts.Length * 5,
                    AutoStart = true,
                });
        }

        /// <summary>
        /// 距离过期时间还有多少秒
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public long TTL(string key)
        {
            return Redis.Ttl(key);
        }
        /// <summary>
        /// 设置过期时间
        /// </summary>
        /// <param name="key"></param>
        /// <param name="timeout"></param>
        public void Expire(string key, int timeout = 0)
        {
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    secondsTimeOut = timeout;
                }
                Redis.Expire(key, secondsTimeOut);
            }
        }

        #region Key/Value存储

        /// <summary>
        /// 设置缓存
        /// </summary>
        /// <param name="key">缓存建</param>
        /// <param name="value">缓存值</param>
        /// <param name="timeout">过期时间，单位秒,-1：不过期，0：默认过期时间</param>
        /// <returns></returns>
        public bool Set(string key, string value, int timeout = 0)
        {
            Redis.Set(key, value);
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    secondsTimeOut = timeout;
                }
                Redis.Expire(key, secondsTimeOut);
            }
            return true;
        }

        /// <summary>
        /// 设置缓存
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key">缓存建</param>
        /// <param name="t">缓存值</param>
        /// <param name="timeout">过期时间，单位秒,-1：不过期，0：默认过期时间</param>
        /// <returns></returns>
        public bool Set<T>(string key, T t, int timeout = 0)
        {
            Redis.Set<T>(key, t);
            if (timeout >= 0)
            {
                if (timeout > 0)
                {
                    secondsTimeOut = timeout;
                }
                Redis.Expire(key, secondsTimeOut);
            }
            return true;

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="sec"></param>
        /// <param name="value"></param>
        public void SetEX(string key, int sec, string value)
        {
            SetEX<string>(key, sec, value);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="sec"></param>
        /// <param name="value"></param>
        public void SetEX<T>(string key,int sec, T value)
        {
            var str = JsonConvert.SerializeObject(value);
            Redis.SetEx(key, sec, Encoding.UTF8.GetBytes(str));
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">建</param>
        /// <returns></returns>
        public string Get(string key)
        {
            var data = Redis.Get(key);
            if (data != null)
            {
                return Encoding.UTF8.GetString(data);
            }
            return String.Empty;
        }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public T Get<T>(string key)
        {
            return Redis.Get<T>(key);
        }
        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool Remove(string key)
        {
            return Redis.Remove(key);
        }
        #endregion

        //释放资源
        public void Dispose()
        {
            if (Redis != null)
            {
                Redis.Dispose();
                Redis = null;
            }
            GC.Collect();
        }
    }

 netCore  Session 读写Object扩展:

 public static class SessionExtensions
    {
        public static void SetObject(this ISession session, string key, object value)
        {
            session.SetString(key, JsonConvert.SerializeObject(value));
        }

        public static T GetObject<T>(this ISession session, string key)
        {
            var value = session.GetString(key);
            return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
        }
    }