先看MSDN上的解釋：
????? HttpContext.Current.Cache：為當前 HTTP 請求獲取Cache對象。
????? HttpRuntime.Cache：獲取當前應用程序的Cache。?
????? 我們再用.NET Reflector工具看看HttpContext.Cache和HttpRuntime.Cache的實現：

HttpContext.Cache和HttpRuntime.Cache實現
??? //System.Web.HttpContext.Cache屬性實現
??? public sealed class HttpContext
??? {
??????? public Cache Cache
??????? {
??????????? get
??????????? {
??????????????? return HttpRuntime.Cache;
??????????? }
??????? }
??? }

??? //System.Web.HttpRuntime.Cache屬性實現
??? public sealed class HttpRuntime
??? {
??????? public static Cache Cache
??????? {
??????????? get
??????????? {
??????????????? if (AspInstallDirectoryInternal == null)
??????????????? {
??????????????????? throw new HttpException(SR.GetString("Aspnet_not_installed", new object[] { VersionInfo.SystemWebVersion }));
??????????????? }
??????????????? Cache cache = _theRuntime._cachePublic;
??????????????? if (cache == null)
??????????????? {
??????????????????? CacheInternal cacheInternal = CacheInternal;
??????????????????? CacheSection cacheSection = RuntimeConfig.GetAppConfig().Cache;
??????????????????? cacheInternal.ReadCacheInternalConfig(cacheSection);
??????????????????? _theRuntime._cachePublic = cacheInternal.CachePublic;
??????????????????? cache = _theRuntime._cachePublic;
??????????????? }
??????????????? return cache;
??????????? }
??????? }
??? }

?????? 通過上面的代碼我們可以看出：HttpContext.Current.Cache是調用HttpRuntime.Cache實現的，兩者指向同一Cache對象。那么兩者到底有沒有區別的？既然兩個指向的是同一Cache對象，兩者的差別只能出現在HttpContext和HttpRuntime上了。我們再來看看MSDN中HttpContext和HttpRuntime的定義。
????? HttpContext：封裝有關個別HTTP請求的所有HTTP特定的信息，HttpContext.Current為當前的HTTP請求獲取HttpContext對象。
????? HttpRuntime：為當前應用程序提供一組ASP.NET運行時服務。

????? 由上面的定義可以看出：HttpRuntime.Cache相當于就是一個緩存具體實現類，這個類雖然被放在了System.Web命名空間下，但是非Web應用下也是可以使用；HttpContext.Current.Cache是對上述緩存類的封裝，由于封裝到了HttpContext類中，局限于只能在知道HttpContext下使用，即只能用于Web應用。

????? 下面的例子可以很好的說明這一點：

HttpContext.Cache和HttpRuntime.Cache的示例
??? class CacheTest
??? {
??????? static void Main(string[] args)
??????? {???????
??????????? System.Web.Caching.Cache httpRuntimeCache = System.Web.HttpRuntime.Cache;
??????????? httpRuntimeCache.Insert("httpRuntimeCache", "I am stored in HttpRuntime.Cache");

??????????? if (httpRuntimeCache != null)
??????????? {
??????????????? Console.WriteLine("httpRuntimeCache:" + httpRuntimeCache["httpRuntimeCache"]);
??????????? }

??????????? System.Web.HttpContext httpContext = System.Web.HttpContext.Current;
??????????? if (httpContext == null)
??????????? {
??????????????? Console.WriteLine("HttpContext object is null in Console Project");
??????????? }
??????????? else
??????????? {
??????????????? System.Web.Caching.Cache httpContextCache = httpContext.Cache;
??????????????? httpContextCache.Insert("httpContextCache", "I am stored in HttpRuntime.Cache");
??????????????? if (httpContextCache == null)
??????????????? {
??????????????????? Console.WriteLine("httpContextCache is null");
??????????????? }
??????????? }
?????????????
??????????? Console.ReadLine();
??????? }
??? }

????? 輸出結果：httpRuntimeCache:I am stored in HttpRuntime.Cache
????? HttpContext object is null in Console Project

????? 綜上：我們在使用Cache時，盡量使用HttpRuntime.Cache，既能減少出錯，也減少了一次函數調用。

????? 參考資料：HttpRuntime.Cache 與HttpContext.Current.Cache的疑問，HttpRuntime.Cache vs. HttpContext.Current.Cache

?

出處：http://blog.csdn.net/qwlovedzm/article/details/7024405

===============================================================================

下面我們看看簡單的緩存類處理：

using System; using System.Collections; using System.Web; using System.Web.Caching;namespace aaaaa.Api.Business {/// <summary>/// 緩存類/// </summary>public class CacheHelper{/// <summary>/// 增加一個緩存對象/// </summary>/// <param name="strKey">鍵值名稱</param>/// <param name="valueObj">被緩存對象</param>/// <param name="durationMin">緩存失效時間（默認為5分鐘）</param>/// <param name="cachePriority">保留優先級(枚舉數值)</param>/// <returns>緩存寫入是否成功true 、false</returns>public static bool InsertCach(string strKey, object valueObj, int durationMin,CacheItemPriority cachePriority = CacheItemPriority.Default){TimeSpan ts;if (!string.IsNullOrWhiteSpace(strKey) && valueObj != null){//onRemove是委托執行的函數，具體方法看下面的onRemove(...)CacheItemRemovedCallback callBack = new CacheItemRemovedCallback(onRemove);ts = durationMin == 0 ? new TimeSpan(0, 5, 0) : new TimeSpan(0, durationMin, 0);//HttpContext.Current.Cache.Insert( HttpRuntime.Cache.Insert(strKey,valueObj,null,DateTime.Now.Add(ts),Cache.NoSlidingExpiration,cachePriority,callBack);return true;}else{return false;}}/// <summary>/// 判斷緩存對象是否存在/// </summary>/// <param name="strKey">緩存鍵值名稱</param>/// <returns>是否存在true 、false</returns>public static bool IsExist(string strKey){//return HttpContext.Current.Cache[strKey] != null;return HttpRuntime.Cache.Get(strKey) != null;}/// <summary>/// 讀取緩存對象/// </summary>/// <param name="strKey">緩存鍵值名稱</param>/// <returns>緩存對象，objec類型</returns>public static object GetCache(string strKey){//if (HttpContext.Current.Cache[strKey] != null)if (IsExist(strKey)){object obj = HttpRuntime.Cache.Get(strKey);return obj ?? null;}else{return null;}}/// <summary>/// 移除緩存對象/// </summary>/// <param name="strKey">緩存鍵值名稱</param>public static void Remove(string strKey){//if (HttpContext.Current.Cache[strKey] != null)if (IsExist(strKey)){HttpRuntime.Cache.Remove(strKey);}}/// <summary>/// 清除所有緩存/// </summary>public static void Clear(){IDictionaryEnumerator enu = HttpRuntime.Cache.GetEnumerator();while (enu.MoveNext()){Remove(enu.Key.ToString());}}public static CacheItemRemovedReason reason;/// <summary>/// 此方法在值失效之前調用，可以用于在失效之前更新數據庫，或從數據庫重新獲取數據/// </summary>/// <param name="strKey"></param>/// <param name="obj"></param>/// <param name="reason"></param>private static void onRemove(string strKey, object obj, CacheItemRemovedReason r){reason = r;}//... } }

?

出處：http://blog.csdn.net/joyhen/article/details/40379145

=======================================================================

引用：System.Runtime.Caching.dll，如下測試，fm4.5

static void CacheTest(){string cname = "filescontents";ObjectCache cc = MemoryCache.Default;string fileContents = cc[cname] as string;if (fileContents == null){CacheItemPolicy policy = new CacheItemPolicy();TimeSpan sp = new TimeSpan(0, 1, 0);policy.SlidingExpiration = sp;List<string> filePaths = new List<string>();string path = System.IO.Directory.GetCurrentDirectory() + "\\example.txt";filePaths.Add(path);policy.ChangeMonitors.Add(new HostFileChangeMonitor(filePaths));fileContents = System.IO.File.ReadAllText(path, Encoding.Default);cc.Set(cname, fileContents, policy);}Console.WriteLine(fileContents);}static void Main(string[] args){//ExecuteCode(WriteData);//ExecuteCode(ReadData);//ExecuteCode(TransData);bool quit = false;while (!quit){Console.Write("get cache: ");string demo = Console.ReadLine();switch (demo){case "Y": ExecuteCode(CacheTest); break;case "Q":quit = true;break;default:Console.WriteLine("Choose a Word of Y and Q(to quit)");break;}}Console.ReadKey();}public static void ExecuteCode(Action a){System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();stopwatch.Start();a();stopwatch.Stop();TimeSpan timespan = stopwatch.Elapsed;Console.WriteLine("運行{0}秒", timespan.TotalSeconds);}

?

出處：http://blog.csdn.net/joyhen/article/details/39990455

轉載于:https://www.cnblogs.com/mq0036/p/7016677.html

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