ASP.NET页面缓存常见的4种方式

#region 内存缓存  public class MemoryCache  {   #region 写   /// <summary>   /// 向内存写入数据缓存   /// </summary>   /// <remarks>TOMMYHU2011-7-28 10:25创建</remarks>   /// <param name="cachekey">缓存标识关键字</param>   /// <param name="cacheresult">需要存放的数据</param>   /// <param name="cachetime">单位秒</param>   public static void InertMemoryCache(string cachekey, object cacheresult, int cachetime)   {   if (cacheresult != null)   {    System.Web.HttpRuntime.Cache.Insert(cachekey, cacheresult, null    , System.Web.Caching.Cache.NoAbsoluteExpiration, TimeSpan.FromSeconds(cachetime));   }   }   #endregion   #region 读   /// <summary>   /// 根据缓存标识读取内存缓存信息   /// </summary>   /// <remarks>TOMMYHU2011-7-28 10:25创建</remarks>   /// <param name="cachekey">缓存标识关键字</param>   /// <returns>内存缓存数据</returns>   public static object ReadMemoryCache(string cachekey)   {   object obj = System.Web.HttpRuntime.Cache.Get(cachekey);   if (obj != null)   {    return obj;   }   return null;   }   #endregion  }  #endregion 

 #region xml缓存  public static class XmlCache  {   private static string m_CacheFolderName = null;    #region 获取/生成缓存文件方法(无cmdParams)   /// <summary>   /// 获取/生成缓存文件方法(DataTable)   /// </summary>   /// <param name="SQL">用于将Sql转化为MD5字符串</param>   /// <param name="CacheFilePath">存放Xml文件的相对路径(根目录已预置)</param>   /// <param name="CacheTime">缓存时间</param>   /// <param name="DataUsed">使用的数据库的链接字符串</param>   /// <returns></returns>   public static DataTable CacheFileByDataTable(string SQL, string CacheFilePath, int CacheTime)   {   SQLHelper.SQLHelper QuerySql = new SQLHelper.SQLHelper();   if (CacheFilePath != string.Empty && CacheFilePath.StartsWith("/"))   {    CacheFilePath = CacheFilePath.Remove(0, 1);   }    string SqlMd5 = SQL;//用于将Sql转化为MD5字符串    string StrSqlByMd5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(SqlMd5, "MD5");//生成的Md5文件名    string MyCacheFilePath = "";    if (CacheTime >= 10000)//如果大于20天的话系统默认为持久   {    MyCacheFilePath = XmlCache.CacheFolderNameP + CacheFilePath;//用于存放Xml文件的相对路径   }   else   {    MyCacheFilePath = XmlCache.CacheFolderName + CacheFilePath;//用于存放Xml文件的相对路径   }     int MyCacheTime = CacheTime;//缓存时间(分)    DataTable dt = new DataTable();//存放数据记录的DataTable    DataTable CacheDt = new DataTable();//获取缓存数据记录的DataTable     //尝试获取缓存数据记录   try   {    CacheDt = DataTableCache.GetDTCache(MyCacheTime, MyCacheFilePath, StrSqlByMd5);   }   catch   {    CacheDt = null;   }   if (CacheDt != null)//获取到缓存的XML文件   {    dt = CacheDt;   }   else//未获取到缓存的XML文件   {    //生成DataTable(如果用Query查询请用Query.ProcessSql方法)    //dt = Query.ProcessSql(SqlMd5, DataUsed);    dt = QuerySql.retDT(SQL);     //将DataTable存为XML文件    try    {    if (dt.DataSet != null)    {     dt.DataSet.Tables.Remove(dt);    }     DataTableCache.SetDTCache(MyCacheFilePath, StrSqlByMd5, dt);    }    catch (Exception ex)    {    //Log.GetComLogger().Error("将DataTable存为XML文件出错：" + ex.Message);    }   }   return dt;   }    /// <summary>   /// 获取/生成缓存文件方法(DataSet) Add By WJ 08-10-23   /// </summary>   /// <param name="SQL">用于将Sql转化为MD5字符串</param>   /// <param name="CacheFilePath">存放Xml文件的相对路径(根目录已预置)</param>   /// <param name="CacheTime">缓存时间</param>   /// <param name="DBName">使用的数据库的链接字符串</param>   /// <returns></returns>   public static DataSet CacheFileByDataSet(string SQL, string CacheFilePath, int CacheTime)   {   SQLHelper.SQLHelper QuerySql = new SQLHelper.SQLHelper();   if (CacheFilePath != string.Empty && CacheFilePath.StartsWith("/"))   {    CacheFilePath = CacheFilePath.Remove(0, 1);   }    string SqlMd5 = SQL;//用于将Sql转化为MD5字符串    string StrSqlByMd5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(SqlMd5, "MD5");//生成的Md5文件名    string MyCacheFilePath = XmlCache.CacheFolderName + CacheFilePath;//用于存放Xml文件的相对路径    int MyCacheTime = CacheTime;//缓存时间(分)    DataSet ds = new DataSet();//存放数据记录的DataSet    DataSet CacheDs = new DataSet();//获取缓存数据记录的DataSet    //尝试获取缓存数据记录   try   {    CacheDs = DataTableCache.GetDSCache(MyCacheTime, MyCacheFilePath, StrSqlByMd5);   }   catch   {    CacheDs = null;   }   if (CacheDs != null)//获取到缓存的XML文件   {    ds = CacheDs;   }   else//未获取到缓存的XML文件   {    //生成DataSet    //ds = Query.ProcessMultiSql(SqlMd5, DBName);    ds = QuerySql.retDS(SQL);     //将DataSet存为XML文件    try    {    DataTableCache.SetDSCache(MyCacheFilePath, StrSqlByMd5, ds);    }    catch    { }   }   return ds;   }    #endregion    #region 获取/生成缓存文件方法(有cmdParams)   /// <summary>   /// 获取/生成缓存文件方法(DataTable)   /// </summary>   /// <param name="SQL">用于将Sql转化为MD5字符串</param>   /// <param name="CacheFilePath">存放Xml文件的相对路径(根目录已预置)</param>   /// <param name="CacheTime">缓存时间</param>   /// <param name="DataUsed">使用的数据库的链接字符串</param>   /// <param name="cmdParams">以数组形式提供SqlCommand命令中用到的参数列表</param>   /// <returns></returns>   public static DataTable CacheFileByDataTable(string SQL, string CacheFilePath, int CacheTime, string DBConstr, params SqlParameter[] cmdParams)   {   SQLHelper.SQLHelper QuerySql = new SQLHelper.SQLHelper();   if (CacheFilePath != string.Empty && CacheFilePath.StartsWith("/"))   {    CacheFilePath = CacheFilePath.Remove(0, 1);   }    string SqlMd5 = SQL;//用于将Sql转化为MD5字符串    string sqlmd5params = SQL;   if (cmdParams != null)   {    for (int i = 0; i < cmdParams.Length; i++)    {    if (cmdParams[i].Value != null)     sqlmd5params += cmdParams[i].Value.ToString();    }   }    string StrSqlByMd5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sqlmd5params, "MD5");//生成的Md5文件名    string MyCacheFilePath = "";    if (CacheTime >= 10000)//如果大于20天的话系统默认为持久   {    MyCacheFilePath = XmlCache.CacheFolderNameP + CacheFilePath;//用于存放Xml文件的相对路径   }   else   {    MyCacheFilePath = XmlCache.CacheFolderName + CacheFilePath;//用于存放Xml文件的相对路径   }    int MyCacheTime = CacheTime;//缓存时间(分)    DataTable dt = new DataTable();//存放数据记录的DataTable    DataTable CacheDt = new DataTable();//获取缓存数据记录的DataTable     //尝试获取缓存数据记录   CacheDt = DataTableCache.GetDTCache(MyCacheTime, MyCacheFilePath, StrSqlByMd5);    if (CacheDt != null)//获取到缓存的XML文件   {    dt = CacheDt;   }   else//未获取到缓存的XML文件   {    //生成DataTable(如果用Query查询请用Query.ProcessSql方法)    //dt = Query.ProcessSql(SqlMd5, DataUsed);    dt = QuerySql.retDT(SqlMd5);    DataTable dt1 = new DataTable();    if (dt != null)    {    dt1 = dt.Copy();    }    //将DataTable存为XML文件    DataTableCache.SetDTCache(MyCacheFilePath, StrSqlByMd5, dt1);   }   return dt;   }     /// <summary>   /// 获取/生成缓存文件方法(DataSet) Add By wjf   /// </summary>   /// <param name="SQL">用于将Sql转化为MD5字符串</param>   /// <param name="CacheFilePath">存放Xml文件的相对路径(根目录已预置)</param>   /// <param name="CacheTime">缓存时间</param>   /// <param name="DBName">使用的数据库的链接字符串</param>   /// <param name="cmdParams">以数组形式提供SqlCommand命令中用到的参数列表</param>   /// <returns></returns>   public static DataSet CacheFileByDataSet(string SQL, string CacheFilePath, int CacheTime, string DBConstr, params SqlParameter[] cmdParams)   {   SQLHelper.SQLHelper QuerySql = new SQLHelper.SQLHelper();   string SqlMd5 = SQL;//用于将Sql转化为MD5字符串    string sqlmd5params = SQL;   if (cmdParams != null)   {    for (int i = 0; i < cmdParams.Length; i++)    {    if (cmdParams[i].Value != null)     sqlmd5params += cmdParams[i].Value.ToString();    }   }    string StrSqlByMd5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sqlmd5params, "MD5");//生成的Md5文件名    string MyCacheFilePath = XmlCache.CacheFolderName + CacheFilePath;//用于存放Xml文件的相对路径    int MyCacheTime = CacheTime;//缓存时间(分)    DataSet ds = new DataSet();//存放数据记录的DataSet    DataSet CacheDs = new DataSet();//获取缓存数据记录的DataSet    //尝试获取缓存数据记录   CacheDs = DataTableCache.GetDSCache(MyCacheTime, MyCacheFilePath, StrSqlByMd5);    if (CacheDs != null)//获取到缓存的XML文件   {    ds = CacheDs;   }   else//未获取到缓存的XML文件   {    //生成DataSet    //ds = Query.ProcessMultiSql(SqlMd5, DBName);    ds = QuerySql.retDS(SqlMd5);    DataSet ds1 = new DataSet();    if (ds != null)    {    ds1 = ds.Copy();    }    //将DataSet存为XML文件    DataTableCache.SetDSCache(MyCacheFilePath, StrSqlByMd5, ds1);   }   return ds;   }   #endregion    #region 非持久保持   /// <summary>   /// 非持久保持   /// </summary>   public static string CacheFolderName   {   get   {    if (m_CacheFolderName == null)//如果Global.asax中未定义路径    {    m_CacheFolderName = System.Configuration.ConfigurationManager.AppSettings.GetValues("CachePathRoot")[0];    if (m_CacheFolderName == null)//如果Web.Config中未定义路径    {     return "/CacheData/" + DateTime.Now.ToString("yyyyMMdd") + "/";    }    else    {     return m_CacheFolderName + DateTime.Now.ToString("yyyyMMdd") + "/";    }    }    else    {    return m_CacheFolderName + DateTime.Now.ToString("yyyyMMdd") + "/";    }   }    set   {    m_CacheFolderName = value;   }   }   #endregion    #region 持久保存(例如存放MapBar缓存的数据或需要3个月以上更新的数据等)   /// <summary>   /// 持久保存(例如存放MapBar缓存的数据或需要3个月以上更新的数据等)   /// </summary>   public static string CacheFolderNameP   {   get   {    if (m_CacheFolderName == null)//如果Global.asax中未定义路径    {    m_CacheFolderName = System.Configuration.ConfigurationManager.AppSettings.GetValues("CachePathRoot")[0];    if (m_CacheFolderName == null)//如果Web.Config中未定义路径    {     return "/CacheData/";    }    else    {     return m_CacheFolderName;    }    }    else    {    return m_CacheFolderName;    }   }    set   {    m_CacheFolderName = value;   }   }   #endregion  }  #endregion