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