前言：最近在專案里將一批不常改變的資料做了快取，但是一旦改變時需要立即更新快取，針對此需求，開始接觸清理快取的研究，截止到目前，已經找到好幾種方法了，供大家參考：
1-（手動）使用IIS應用程式池，手動回收；
2-（手動）如果應用程式池配置的：發生配置更改時禁止回收，的值是默認值False的話，可以通過修改應用組態檔：web.config；
3-（自動）使用代碼回收應用程式池，借助ServerManager管理類實作，參照下面代碼示例；
4-（自動、推薦）使用HttpRuntime.Cache快取的機制清理，通過Cache.Remove清理指定快取Key，也可以通過快取依賴檔案的機制通過修改快取依賴檔案來間接清理的辦法；
其中前兩種都是手動清理的方案，只能用于臨時使用， （核武器）
長久的辦法還是推薦3和4，其中3屬于整個應用的快取全部回收了，這個一般情況下也不建議使用，除非整個專案更新可以， （核武器）
方案4是重點推薦的方案，可以達到點對點清理或者清理依賴特定快取檔案的快取資料， （跟巡航導彈類似，指哪打哪）
方案三的代碼如下，摘抄老師的原始碼：
/// <summary> /// IIS應用程式池輔助類 /// </summary> public class IISManagerHelper { #region IIS 元資料庫和IIS 6配置兼容性 private const string HOST = "localhost"; /// <summary> /// 取得所有應用程式池 /// 要解決這個問題就得安裝“IIS 元資料庫和IIS 6配置兼容性”， /// “控制面板”->“程式和功能”->面板左側“打開或關閉windows功能”->“Internet資訊服務”->“Web管理工具”->“IIS 6管理兼容性”->“IIS 元資料庫和IIS 6配置兼容性”， /// </summary> /// <returns></returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static List<string> GetAppPools_IIS6() { DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); return (from DirectoryEntry entry in appPools.Children select entry.Name).ToList(); } [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static PropertyCollection GetAppPoolProperties_IIS6(string appPoolName) { PropertyCollection propertyCollection = null; DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); foreach (DirectoryEntry entry in appPools.Children) { if (entry.Name == appPoolName) { propertyCollection = entry.Properties; } } return propertyCollection; } /// <summary> /// 獲取應用程式數量 /// </summary> /// <param name="appName"></param> /// <returns></returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static int GetAppNumber_IIS6(string appName) { int appNumber; Hashtable hashTable = new Hashtable(); List<string> poolList = GetAppPools_IIS6(); //獲取應用程式池名稱陣列 foreach (string i in poolList) //填充哈希表key值內容 { hashTable.Add(i, ""); } GetPoolWeb_IIS6(); Dictionary<string, int> dic = new Dictionary<string, int>(); foreach (string i in poolList) { appNumber = hashTable[i].ToString() != "" ? Convert.ToInt32(hashTable[i].ToString().Split(',').Length.ToString()) : 0; dic.Add(i, appNumber); } dic.TryGetValue(appName, out appNumber); return appNumber; } /// <summary> /// 獲取IIS版本 /// </summary> /// <returns></returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static string GetIisVersion_IIS6() { string version = string.Empty; try { DirectoryEntry getEntity = new DirectoryEntry("IIS://LOCALHOST/W3SVC/INFO"); version = getEntity.Properties["MajorIISVersionNumber"].Value.ToString(); } catch (Exception se) { //說明一點:IIS5.0中沒有(int)entry.Properties["MajorIISVersionNumber"].Value;屬性，將拋出例外 證明版本為 5.0 } return version; } /// <summary> /// 判斷程式池是否存在 /// </summary> /// <param name="appPoolName">程式池名稱</param> /// <returns>true存在 false不存在</returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static bool IsAppPoolExsit_IIS6(string appPoolName) { bool result = false; DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); foreach (DirectoryEntry entry in appPools.Children) { if (!entry.Name.Equals(appPoolName)) continue; result = true; break; } return result; } /// <summary> /// 創建應用程式池 /// </summary> /// <param name="appPool"></param> /// <returns></returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static bool CreateAppPool_IIS6(string appPool) { try { if (!IsAppPoolExsit_IIS6(appPool)) { DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); DirectoryEntry entry = appPools.Children.Add(appPool, "IIsApplicationPool"); entry.CommitChanges(); return true; } } catch { return false; } return false; } /// <summary> /// 操作應用程式池 /// </summary> /// <param name="appPoolName"></param> /// <param name="method">Start==啟動 Recycle==回收 Stop==停止</param> /// <returns></returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static bool DoAppPool_IIS6(string appPoolName, string method) { bool result = false; try { DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); DirectoryEntry findPool = appPools.Children.Find(appPoolName, "IIsApplicationPool"); findPool.Invoke(method, null); appPools.CommitChanges(); appPools.Close(); result = true; } catch (Exception) { result = false; } return result; } /// <summary> /// 洗掉指定程式池 /// </summary> /// <param name="appPoolName">程式池名稱</param> /// <returns>true洗掉成功 false洗掉失敗</returns> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] public static bool DeleteAppPool_IIS6(string appPoolName) { bool result = false; DirectoryEntry appPools = new DirectoryEntry(string.Format("IIS://{0}/W3SVC/AppPools", HOST)); foreach (DirectoryEntry entry in appPools.Children) { if (!entry.Name.Equals(appPoolName)) continue; try { entry.DeleteTree(); result = true; break; } catch { result = false; } } return result; } /// <summary> /// 獲得所有的應用程式池和對應站點 /// </summary> [System.Obsolete("IIS 元資料庫和IIS 6配置兼容性")] private static void GetPoolWeb_IIS6() { Hashtable hashTable = new Hashtable(); List<string> poolList = GetAppPools_IIS6(); //獲取應用程式池名稱陣列 foreach (string i in poolList) //填充哈希表key值內容 { hashTable.Add(i, ""); } DirectoryEntry root = new DirectoryEntry("IIS://localhost/W3SVC"); foreach (DirectoryEntry website in root.Children) { if (website.SchemaClassName != "IIsWebServer") continue; string comment = website.Properties["ServerComment"][0].ToString(); DirectoryEntry siteVDir = website.Children.Find("Root", "IISWebVirtualDir"); string poolname = siteVDir.Properties["AppPoolId"][0].ToString().Trim(); if (string.IsNullOrWhiteSpace(poolname)) { poolname = website.Properties["AppPoolId"][0].ToString().Trim(); } foreach (string i in poolList) { if (i != poolname) continue; if (hashTable[i].ToString() == "") hashTable[i] = comment; else hashTable[i] += "," + comment; } } root.Close(); } #endregion #region IIS7 /// <summary> /// 取得所有應用程式池 IIS7 /// https://forums.iis.net/t/1151611.aspx /// </summary> /// <returns></returns> public static List<ApplicationPool> GetAppPools() { return new ServerManager().ApplicationPools.ToList(); } /// <summary> /// 操作應用程式池 /// </summary> /// <param name="appPoolName"></param> /// <param name="method">Start==啟動 Recycle==回收 Stop==停止</param> /// <returns></returns> public static bool DoAppPool(string appPoolName, string method) { bool result = false; ServerManager iisManager = new ServerManager(); ApplicationPool appPool = iisManager.ApplicationPools[appPoolName]; if (appPool != null) { try { switch (method.ToLower()) { case "stop": appPool.Stop(); break; case "start": appPool.Start(); break; case "recycle": appPool.Recycle(); break; default: return false; } iisManager.CommitChanges(); result = true; } catch (Exception) { result = false; } } return result; } /// <summary> /// 創建應用程式池 /// https://wenku.baidu.com/view/6fc31eaad1f34693daef3e28.html /// </summary> /// <param name="appPoolName"></param> /// <param name="username"></param> /// <param name="pwd"></param> /// <returns></returns> public bool CreateAppPool(string appPoolName, string username, string pwd) { ServerManager iisManager = new ServerManager(); ApplicationPool appPool = iisManager.ApplicationPools.Add(appPoolName); appPool.AutoStart = true; appPool.ManagedPipelineMode = ManagedPipelineMode.Integrated; appPool.ManagedRuntimeVersion = "v2.0"; appPool.ProcessModel.IdentityType = ProcessModelIdentityType.SpecificUser; appPool.ProcessModel.UserName = username; appPool.ProcessModel.Password = pwd; iisManager.CommitChanges(); return true; } /// <summary> /// 編輯應用程式池 /// </summary> /// <param name="application"></param> /// <returns></returns> public static bool EditAppPool(ApplicationPool application) { string appPoolName = application.Name; ServerManager iisManager = new ServerManager(); ApplicationPool appPool = iisManager.ApplicationPools[appPoolName]; if (appPool != null) { appPool.ManagedRuntimeVersion = application.ManagedRuntimeVersion; appPool.ManagedPipelineMode = application.ManagedPipelineMode; iisManager.CommitChanges(); } return true; } /// <summary> /// 洗掉指定程式池 /// </summary> /// <param name="appPoolName">程式池名稱</param> /// <returns>true洗掉成功 false洗掉失敗</returns> public static bool DeleteAppPool(string appPoolName) { ServerManager iisManager = new ServerManager(); ApplicationPool appPool = iisManager.ApplicationPools[appPoolName]; if (appPool != null) { iisManager.ApplicationPools.Remove(appPool); iisManager.CommitChanges(); } return true; } /// <summary> /// 判斷某一個站點是否存在 /// </summary> /// <param name="webSiteName"></param> /// <returns></returns> public bool IsExistWebSite(string webSiteName) { ServerManager iisManager = new ServerManager(); Site site = iisManager.Sites[webSiteName]; return site != null; } /// <summary> /// 創建某一個站點 /// </summary> /// <param name="webSiteName"></param> /// <param name="appPoolName"></param> /// <param name="schema"></param> /// <param name="port"></param> /// <param name="certHashString"></param> /// <param name="physicalPath"></param> public void CreateWebSite(string webSiteName, string appPoolName, string schema, int port, string certHashString, string physicalPath) { ServerManager iisManager = new ServerManager(); Site site = null; if (string.Compare(schema, "http", StringComparison.OrdinalIgnoreCase) == 0) { site = iisManager.Sites.Add(webSiteName, schema, string.Format("*:{0}:", port), physicalPath); } else if (string.Compare(schema, "https", StringComparison.OrdinalIgnoreCase) == 0) { byte[] certHashs = certHashString.HashStringToByteArray(); site = iisManager.Sites.Add(webSiteName, string.Format("*:{0}:", port), physicalPath, certHashs); //enable require SSL Configuration config = iisManager.GetApplicationHostConfiguration(); ConfigurationSection accessSection = config.GetSection("system.webServer/security/access", webSiteName); accessSection["sslFlags"] = @"Ssl"; } else { throw new Exception();//ToDo….; } site.ServerAutoStart = true; site.Applications["/"].ApplicationPoolName = appPoolName; iisManager.CommitChanges(); } /// <summary> /// 洗掉某一個站點 /// </summary> /// <param name="webSiteName"></param> public void DeleteWebSite(string webSiteName) { ServerManager iisManager = new ServerManager(); Site site = iisManager.Sites[webSiteName]; iisManager.Sites.Remove(site); iisManager.CommitChanges(); } #endregion }View Code
方案四的代碼如下，也是已拖老師的原始碼，自己做了幫助類封裝特定的需求：
a-老師的底層類：
/// <summary> /// 資料快取總線(主要用在Web專案) /// </summary> [System.Diagnostics.DebuggerStepThrough] public partial class DataCacheBus { /// <summary> /// 判斷檔案是否存在 /// </summary> /// <param name="filePath"></param> /// <returns></returns> private static bool IsExistFilePath(string filePath) { if (string.IsNullOrWhiteSpace(filePath)) return false; return File.Exists(filePath); } /// <summary> /// GenerateFile 將字串寫成檔案 /// </summary> private static void GenerateFile(string filePath, string fileContent) { string directoryPath = Path.GetDirectoryName(filePath); if (!Directory.Exists(directoryPath)) { Directory.CreateDirectory(directoryPath); } using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.Read)) { using (StreamWriter sw = new StreamWriter(fs, Encoding.UTF8)) { sw.Write(fileContent); sw.Flush(); } } } /// <summary> /// GenerateFile 生成檔案 /// </summary> /// <param name="filePath"></param> public static void GenerateFile(string filePath) { if (!IsExistFilePath(filePath)) { GenerateFile(filePath, "author:wangyunpeng"); } } /// <summary> /// 插入快取物件 /// </summary> /// <param name="key"></param> /// <param name="value"></param> public static void Insert(string key, object value) { Insert(key, value, (CacheDependency)null); } /// <summary> /// 插入快取物件(快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="dependencyFile">檔案依賴</param> public static void Insert(string key, object value, string dependencyFile) { GenerateFile(dependencyFile); Insert(key, value, new CacheDependency(dependencyFile)); } /// <summary> /// 插入快取物件(快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="dependencies">快取依賴</param> public static void Insert(string key, object value, CacheDependency dependencies) { HttpRuntime.Cache.Insert(key, value, dependencies); } /// <summary> /// 插入快取物件(快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="dependencyFile">檔案依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, string dependencyFile, CacheItemRemovedCallback onRemoveCallBack) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="dependencies">快取依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, CacheDependency dependencies, CacheItemRemovedCallback onRemoveCallBack) { HttpRuntime.Cache.Insert(key, value, dependencies, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(絕對過期時間) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration">絕對過期時間</param> public static void Insert(string key, object value, DateTime absoluteExpiration) { Insert(key, value, absoluteExpiration, (CacheDependency)null); } /// <summary> /// 插入快取物件(絕對過期時間) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration">絕對過期時間</param> /// <param name="dependencyFile">檔案依賴</param> public static void Insert(string key, object value, DateTime absoluteExpiration, string dependencyFile) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), absoluteExpiration.ToUniversalTime(), Cache.NoSlidingExpiration); } /// <summary> /// 插入快取物件(絕對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration">絕對過期時間</param> /// <param name="dependencies">快取依賴</param> public static void Insert(string key, object value, DateTime absoluteExpiration, CacheDependency dependencies) { HttpRuntime.Cache.Insert(key, value, dependencies, absoluteExpiration.ToUniversalTime(), Cache.NoSlidingExpiration); } /// <summary> /// 插入快取物件(絕對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration">絕對過期時間</param> /// <param name="dependencyFile">檔案依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, DateTime absoluteExpiration, string dependencyFile, CacheItemRemovedCallback onRemoveCallBack) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), absoluteExpiration.ToUniversalTime(), Cache.NoSlidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(絕對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration">絕對過期時間</param> /// <param name="dependencies">快取依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, DateTime absoluteExpiration, CacheDependency dependencies, CacheItemRemovedCallback onRemoveCallBack) { HttpRuntime.Cache.Insert(key, value, dependencies, absoluteExpiration.ToUniversalTime(), Cache.NoSlidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(相對過期時間) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="slidingExpiration">相對過期時間</param> public static void Insert(string key, object value, TimeSpan slidingExpiration) { Insert(key, value, slidingExpiration, (CacheDependency)null); } /// <summary> /// 插入快取物件(相對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="slidingExpiration">相對過期時間</param> /// <param name="dependencyFile">檔案依賴</param> public static void Insert(string key, object value, TimeSpan slidingExpiration, string dependencyFile) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), Cache.NoAbsoluteExpiration, slidingExpiration); } /// <summary> /// 插入快取物件(相對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="slidingExpiration">相對過期時間</param> /// <param name="dependencies">快取依賴</param> public static void Insert(string key, object value, TimeSpan slidingExpiration, CacheDependency dependencies) { HttpRuntime.Cache.Insert(key, value, dependencies, Cache.NoAbsoluteExpiration, slidingExpiration); } /// <summary> /// 插入快取物件(相對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="slidingExpiration">相對過期時間</param> /// <param name="dependencyFile">檔案依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, TimeSpan slidingExpiration, string dependencyFile, CacheItemRemovedCallback onRemoveCallBack) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), Cache.NoAbsoluteExpiration, slidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(相對過期時間,快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="slidingExpiration">相對過期時間</param> /// <param name="dependencies">快取依賴</param> /// <param name="onRemoveCallBack">快取消失之后的處理方法</param> public static void Insert(string key, object value, TimeSpan slidingExpiration, CacheDependency dependencies, CacheItemRemovedCallback onRemoveCallBack) { HttpRuntime.Cache.Insert(key, value, dependencies, Cache.NoAbsoluteExpiration, slidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(絕對過期時間，相對過期時間，快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration"></param> /// <param name="slidingExpiration"></param> /// <param name="dependencyFile"></param> public static void Insert(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, string dependencyFile) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), absoluteExpiration.ToUniversalTime(), slidingExpiration); } /// <summary> /// 插入快取物件(絕對過期時間，相對過期時間，快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration"></param> /// <param name="slidingExpiration"></param> /// <param name="dependencies"></param> public static void Insert(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheDependency dependencies) { HttpRuntime.Cache.Insert(key, value, dependencies, absoluteExpiration.ToUniversalTime(), slidingExpiration); } /// <summary> /// 插入快取物件(絕對過期時間，相對過期時間，快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration"></param> /// <param name="slidingExpiration"></param> /// <param name="dependencyFile"></param> /// <param name="onRemoveCallBack"></param> public static void Insert(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, string dependencyFile, CacheItemRemovedCallback onRemoveCallBack) { GenerateFile(dependencyFile); HttpRuntime.Cache.Insert(key, value, new CacheDependency(dependencyFile), absoluteExpiration.ToUniversalTime(), slidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 插入快取物件(絕對過期時間，相對過期時間，快取依賴) /// </summary> /// <param name="key"></param> /// <param name="value"></param> /// <param name="absoluteExpiration"></param> /// <param name="slidingExpiration"></param> /// <param name="dependencies"></param> /// <param name="onRemoveCallBack"></param> public static void Insert(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration, CacheDependency dependencies, CacheItemRemovedCallback onRemoveCallBack) { HttpRuntime.Cache.Insert(key, value, dependencies, absoluteExpiration.ToUniversalTime(), slidingExpiration, CacheItemPriority.High, onRemoveCallBack); } /// <summary> /// 洗掉快取物件 /// </summary> /// <param name="key"></param> /// <returns>不等于null表示回傳洗掉的快取物件,等于null表示快取中沒有指定Key的快取物件</returns> public static object Delete(string key) { return HttpRuntime.Cache.Remove(key); } /// <summary> /// 得到快取物件 /// </summary> /// <param name="key"></param> /// <returns>未找到該Key時為 null</returns> public static object Get(string key) { return HttpRuntime.Cache.Get(key); } /// <summary> /// 獲取所有快取資訊(不包含已過期的快取項) /// </summary> /// <returns></returns> public static IDictionaryEnumerator GetAll() { return HttpRuntime.Cache.GetEnumerator(); } /// <summary> /// 獲取滿足查詢條件的Key的內容 /// </summary> /// <param name="keyContent">要查詢的key（可以寫的不完整）</param> /// <param name="count">取出滿足條件的最大數量</param> /// <returns></returns> public static List<string> GetKey(string keyContent = "_OLD_", bool contains = true, int count = 1000) { if (string.IsNullOrWhiteSpace(keyContent)) { throw new ArgumentException(nameof(keyContent)); } if (count < 1) { throw new ArgumentException(nameof(count)); } object @object = null; string key = null; keyContent = keyContent.ToLower(); List<string> list = new List<string>(count); IDictionaryEnumerator enumerator = GetAll(); while (enumerator.MoveNext()) { @object = enumerator.Key; if (@object is string) { key = (@object as string).ToLower(); if (contains) { if (key.Contains(keyContent)) { list.Add(key); } } else { if (!key.Contains(keyContent) && !key.EndsWith(".html")) { list.Add(key); } } if (list.Count == count) { break; } } } return list; } /// <summary> /// 獲取滿足查詢條件的Key的數量 /// </summary> /// <param name="keyContent">要查詢的key（可以寫的不完整）</param> /// <returns></returns> public static long GetKeyCount(string keyContent = "_OLD_", bool contains = true) { if (string.IsNullOrWhiteSpace(keyContent)) { throw new ArgumentException(nameof(keyContent)); } object @object = null; string key = null; long count = 0L; keyContent = keyContent.ToLower(); IDictionaryEnumerator enumerator = GetAll(); while (enumerator.MoveNext()) { @object = enumerator.Key; if (@object is string) { key = (@object as string).ToLower(); if (contains) { if (key.Contains(keyContent)) { System.Threading.Interlocked.Increment(ref count); } } else { if (!key.Contains(keyContent) && !key.EndsWith(".html")) { System.Threading.Interlocked.Increment(ref count); } } } } return count; } }View Code
b-封裝幫助類-巡航導彈-推薦哈：
public abstract class PayBaseCache { /// <summary> /// 快取檔案依賴項 /// </summary> protected string DependencyFile { get; set; } public PayBaseCache(string dependencyFile) { this.DependencyFile = System.Web.Hosting.HostingEnvironment.MapPath("~/staticfiles/" + dependencyFile); DataCacheBus.GenerateFile(this.DependencyFile); } public void AddCache<T>(string cacheKey, T t, int cacheHours = 1) where T : class { if (DataCacheBus.Get(cacheKey) == null) { DataCacheBus.Insert(cacheKey, t, TimeSpan.FromHours(cacheHours), this.DependencyFile);//相對過期時間 } } public T GetCache<T>(string cacheKey) { T t = (T)DataCacheBus.Get(cacheKey);//相對過期時間 return t; } /// <summary> /// 洗掉單個快取 /// </summary> public void DeleteCache(string cacheKey) { DataCacheBus.Delete(cacheKey); } /// <summary> /// 洗掉當前快取類所有快取資料 /// </summary> public void DeleteAllCache() { //這里注意下：如果檔案刪不了或者快取沒有起到清除效果，有可能是沒有檔案權限 if (File.Exists(this.DependencyFile)) { File.Delete(this.DependencyFile); } } } /// <summary> /// 支付業務快取 /// </summary> public class PayBIZCache : PayBaseCache { public static readonly PayBIZCache instance = new PayBIZCache(); public PayBIZCache() : base("payBizCache.html") { } } /// <summary> /// 支付業務快取 /// </summary> public class PayAccountCache : PayBaseCache { public static readonly PayAccountCache instance = new PayAccountCache(); public PayAccountCache() : base("payAccountCache.html") { } }View Code
簡單介紹一下封裝類：將快取類的使用做了抽象，每個子類對應一個對應的快取檔案用于清理特定業務的所有快取，同時支持清理指定快取，
快取依賴項的機制推薦研究一下！！！
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標籤：.NET技术
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