缓存存储在文件中，根据过期时间过期，也可以手动删除。IIS回收进程时缓存不丢失。

代码：

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.Runtime.Serialization.Formatters.Binary;using System.Threading;namespace Common.Utils{    /// 
    /// 缓存工具类    /// 
    public static class CacheUtil    {        #region 变量        /// 
        /// 缓存路径        /// 
        private static string folderPath = Application.StartupPath + "\\cache";        /// 
        /// 锁        /// 
        private static object _lock = new object();        private static BinaryFormatter formatter = new BinaryFormatter();        #endregion        #region 构造函数        static CacheUtil()        {            if (!Directory.Exists(folderPath))            {                Directory.CreateDirectory(folderPath);            }        }        #endregion        #region SetValue 保存键值对        /// 
        /// 保存键值对        /// 
        public static void SetValue(string key, object value, int expirationMinutes = 0)        {            CacheData data = new CacheData(key, value);            data.updateTime = DateTime.Now;            data.expirationMinutes = expirationMinutes;            string keyMd5 = GetMD5(key);            string path = folderPath + "\\" + keyMd5 + ".txt";            lock (_lock)            {                using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))                {                    fs.SetLength(0);                    formatter.Serialize(fs, data);                    fs.Close();                }            }        }        #endregion        #region GetValue 获取键值对        /// 
        /// 获取键值对        /// 
        public static object GetValue(string key)        {            string keyMd5 = GetMD5(key);            string path = folderPath + "\\" + keyMd5 + ".txt";            if (File.Exists(path))            {                using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))                {                    CacheData data = (CacheData)formatter.Deserialize(fs);                    fs.Close();                    if (data.expirationMinutes > 0 && DateTime.Now.Subtract(data.updateTime).TotalMinutes > data.expirationMinutes)                    {                        File.Delete(path);                        return null;                    }                    return data.value;                }            }            return null;        }        #endregion        #region Delete 删除        /// 
        /// 删除        /// 
        public static void Delete(string key)        {            string keyMd5 = GetMD5(key);            string path = folderPath + "\\" + keyMd5 + ".txt";            if (File.Exists(path))            {                lock (_lock)                {                    File.Delete(path);                }            }        }        #endregion        #region DeleteAll 全部删除        /// 
        /// 全部删除        /// 
        public static void DeleteAll()        {            string[] files = Directory.GetFiles(folderPath);            foreach (string file in files)            {                File.Delete(file);            }        }        #endregion        #region 计算MD5值        /// 
        /// 计算MD5值        /// 
        private static string GetMD5(string value)        {            string base64 = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(value)).Replace("/", "-");            if (base64.Length > 200)            {                MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();                byte[] bArr = md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(value));                StringBuilder sb = new StringBuilder();                foreach (byte b in bArr)                {                    sb.Append(b.ToString("x2"));                }                return sb.ToString();            }            return base64;        }        #endregion    }    #region CacheData 缓存数据    /// 
    /// 缓存数据    /// 
    [Serializable]    public class CacheData    {        /// 
        /// 键        /// 
        public string key { get; set; }        /// 
        /// 值        /// 
        public object value { get; set; }        /// 
        /// 缓存更新时间        /// 
        public DateTime updateTime { get; set; }        /// 
        /// 过期时间(分钟)，0表示永不过期        /// 
        public int expirationMinutes { get; set; }        public CacheData(string key, object value)        {            this.key = key;            this.value = value;        }    }    #endregion}

带文件依赖版：

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;using System.Runtime.Serialization.Formatters.Binary;using System.Threading;using System.Web;namespace Common.Utils{    /// 
    /// 缓存工具类    /// 缓存数据存储在文件中    /// 
    public static class CacheUtil    {        #region 变量        /// 
        /// 锁        /// 
        private static object _lock = new object();        private static BinaryFormatter formatter = new BinaryFormatter();        #endregion        #region SetValue 保存键值对        /// 
        /// 保存键值对        /// 
        public static void SetValue(HttpServerUtilityBase server, string key, object value, string dependentFilePath, int expirationMinutes = 0)        {            CacheData data = new CacheData(key, value);            data.updateTime = DateTime.Now;            data.expirationMinutes = expirationMinutes;            data.dependentFilePath = dependentFilePath;            string folderPath = server.MapPath("~/bin/cache");            if (!Directory.Exists(folderPath))            {                Directory.CreateDirectory(folderPath);            }            string keyMd5 = GetMD5(key);            string path = folderPath + "\\" + keyMd5 + ".txt";            lock (_lock)            {                using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))                {                    fs.SetLength(0);                    formatter.Serialize(fs, data);                    fs.Close();                }            }        }        #endregion        #region GetValue 获取键值对        /// 
        /// 获取键值对        /// 
        public static object GetValue(HttpServerUtilityBase server, string key)        {            string keyMd5 = GetMD5(key);            string folderPath = server.MapPath("~/bin/cache");            string path = folderPath + "\\" + keyMd5 + ".txt";            if (File.Exists(path))            {                using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))                {                    CacheData data = (CacheData)formatter.Deserialize(fs);                    fs.Close();                    FileInfo fileInfo = new FileInfo(data.dependentFilePath);                    if (fileInfo.LastWriteTime > data.updateTime)                    {                        File.Delete(path);                        return null;                    }                    if (data.expirationMinutes > 0 && DateTime.Now.Subtract(data.updateTime).TotalMinutes > data.expirationMinutes)                    {                        File.Delete(path);                        return null;                    }                    return data.value;                }            }            return null;        }        #endregion        #region Delete 删除        /// 
        /// 删除        /// 
        public static void Delete(HttpServerUtilityBase server, string key)        {            string keyMd5 = GetMD5(key);            string folderPath = server.MapPath("~/bin/cache");            string path = folderPath + "\\" + keyMd5 + ".txt";            File.Delete(path);        }        #endregion        #region DeleteAll 全部删除        /// 
        /// 全部删除        /// 
        public static void DeleteAll(HttpServerUtilityBase server)        {            string folderPath = server.MapPath("~/bin/cache");            string[] files = Directory.GetFiles(folderPath);            foreach (string file in files)            {                File.Delete(file);            }        }        #endregion        #region 计算MD5值        /// 
        /// 计算MD5值        /// 
        private static string GetMD5(string value)        {            string base64 = Convert.ToBase64String(ASCIIEncoding.ASCII.GetBytes(value)).Replace("/", "-");            if (base64.Length > 200)            {                MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();                byte[] bArr = md5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(value));                StringBuilder sb = new StringBuilder();                foreach (byte b in bArr)                {                    sb.Append(b.ToString("x2"));                }                return sb.ToString();            }            return base64;        }        #endregion    }    #region CacheData 缓存数据    /// 
    /// 缓存数据    /// 
    [Serializable]    public class CacheData    {        /// 
        /// 键        /// 
        public string key { get; set; }        /// 
        /// 值        /// 
        public object value { get; set; }        /// 
        /// 缓存更新时间        /// 
        public DateTime updateTime { get; set; }        /// 
        /// 过期时间(分钟)，0表示永不过期        /// 
        public int expirationMinutes { get; set; }        /// 
        /// 缓存依赖文件路径        /// 
        public string dependentFilePath { get; set; }        public CacheData(string key, object value)        {            this.key = key;            this.value = value;        }    }    #endregion}

带文件依赖版使用示例：

public class ProductController : Controller{    #region details页面    public ActionResult details(string name)    {        ViewBag.menu = "product";        string headKey = "NetCMS.Web.Controllers.ProductController.details.head." + name;        string bodyKey = "NetCMS.Web.Controllers.ProductController.details.body." + name;        string dependentFilePath = Server.MapPath("~/Theme/pages/product/" + name + ".html");        List
      
        fileList = Directory.GetFiles(Server.MapPath("~/") + "Theme\\pages\\product").ToList();        string file = fileList.Find(a =>        {            string fileName = Path.GetFileNameWithoutExtension(a);            if (name == fileName)            {                return true;            }            return false;        });        string html = string.Empty;        if (CacheUtil.GetValue(Server, headKey) == null || CacheUtil.GetValue(Server, bodyKey) == null)        {            using (StreamReader sr = new StreamReader(file))            {                html = sr.ReadToEnd();                sr.Close();            }        }        string body = string.Empty;        string pre = "\"" + Url.Content("~/");        body = (string)CacheUtil.GetValue(Server, bodyKey);        if (body == null)        {            Regex reg = new Regex(@"
       ((?:[\s\S])*)
       ", RegexOptions.IgnoreCase);            Match m = reg.Match(html);            if (m.Success)            {                body = m.Groups[1].Value;            }            else            {                body = string.Empty;            }            body = body.Replace("\"js/", pre + "Theme/js/");            body = body.Replace("\"css/", pre + "Theme/css/");            body = body.Replace("\"images/", pre + "Theme/images/");            body = body.Replace("(images/", "(" + Url.Content("~/") + "Theme/images/");            body = body.Replace("('images/", "('" + Url.Content("~/") + "Theme/images/");            body = body.Replace("\"uploads/", pre + "Theme/uploads/");            body = body.Replace("('uploads/", "('" + Url.Content("~/") + "Theme/images/");            body = HtmlUtil.RemoveBlank(body);            CacheUtil.SetValue(Server, bodyKey, body, dependentFilePath);        }        ViewBag.body = body;        string head = string.Empty;        head = (string)CacheUtil.GetValue(Server, headKey);        if (head == null)        {            Regex regHead = new Regex(@"((?:[\s\S])*)", RegexOptions.IgnoreCase);            Match mHead = regHead.Match(html);            if (mHead.Success)            {                head = mHead.Groups[1].Value;            }            else            {                head = string.Empty;            }            head = head.Replace("\"js/", pre + "Theme/js/");            head = head.Replace("\"css/", pre + "Theme/css/");            head = head.Replace("\"images/", pre + "Theme/images/");            head = head.Replace("(images/", "(" + Url.Content("~/") + "Theme/images/");            head = head.Replace("('images/", "('" + Url.Content("~/") + "Theme/images/");            head = head.Replace("\"uploads/", pre + "Theme/uploads/");            head = head.Replace("('uploads/", "('" + Url.Content("~/") + "Theme/images/");            CacheUtil.SetValue(Server, headKey, head, dependentFilePath);        }        ViewBag.head = head;        return View();    }    #endregion}