添加项目文件。

Common/CacheHelper.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web;
+using System.Web.Caching;
+
+namespace Epost.Common
+{
+    public class CacheHelper
+    {
+        /// <summary>
+        /// 创建缓存项的文件
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        /// <param name="obj">object对象</param>
+        public static void Insert(string key, object obj)
+        {
+            //创建缓存
+            //HttpContext.Current.Cache.Insert(key, obj);
+            HttpRuntime.Cache.Insert(key, obj);
+        }
+        /// <summary>
+        /// 移除缓存项的文件
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        public static void Remove(string key)
+        {
+            //创建缓存
+            // HttpContext.Current.Cache.Remove(key);
+            HttpRuntime.Cache.Remove(key);
+        }
+        /// <summary>
+        /// 创建缓存项的文件依赖
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        /// <param name="obj">object对象</param>
+        /// <param name="fileName">文件绝对路径</param>
+        public static void Insert(string key, object obj, string fileName)
+        {
+            //创建缓存依赖项
+            CacheDependency dep = new CacheDependency(fileName);
+            //创建缓存
+            //  HttpContext.Current.Cache.Insert(key, obj, dep);
+            HttpRuntime.Cache.Insert(key, obj, dep);
+        }
+
+        /// <summary>
+        /// 创建缓存项过期
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        /// <param name="obj">object对象</param>
+        /// <param name="expires">过期时间(分钟)</param>
+        public static void Insert(string key, object obj, int expires)
+        {
+            //绝对过期：到了指定时间以后便会失效。
+            // HttpContext.Current.Cache.Insert(key, obj, null, DateTime.Now.AddMinutes(expires), System.Web.Caching.Cache.NoSlidingExpiration);
+            HttpRuntime.Cache.Insert(key, obj, null, DateTime.Now.AddMinutes(expires), System.Web.Caching.Cache.NoSlidingExpiration);
+            //滑动过期：在指定时间内无访问请求便失效。
+            //HttpContext.Current.Cache.Insert(key, obj, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, expires, 0));
+        }
+
+        /// <summary>
+        /// 获取缓存对象
+        /// </summary>
+        /// <param name="key">缓存Key</param>
+        /// <returns>object对象</returns>
+        public static object Get(string key)
+        {
+            if (string.IsNullOrEmpty(key))
+            {
+                return null;
+            }
+            //   return HttpContext.Current.Cache.Get(key);
+            return HttpRuntime.Cache.Get(key);
+        }
+
+        /// <summary>
+        /// 获取缓存对象
+        /// </summary>
+        /// <typeparam name="T">T对象</typeparam>
+        /// <param name="key">缓存Key</param>
+        /// <returns></returns>
+        public static T Get<T>(string key)
+        {
+            object obj = Get(key);
+            return obj == null ? default(T) : (T)obj;
+        }
+
+    }
+}