/// <summary>

    /// 根据文件名缓冲指定目录文件

    /// </summary>

    public class FileCacheAdapter

    {

        private string CacheFilePath = string.Empty;

        public FileCacheAdapter(string cacheFilePath)

        {

            CacheFilePath = cacheFilePath;

        }

        public string getCache()

        {

            if (string.IsNullOrEmpty(CacheFilePath))

            {

                return "";

            }

            if (!File.Exists(CacheFilePath))

            {

                return "";

            }

            string cacheKey = Path.GetFileName(CacheFilePath);

            string result = MemoryCache.Default[cacheKey] as string;

            //如果没有命中缓冲，则初始化该缓冲

            if (result == null)

            {

                //缓冲过期策略

                var policy = new CacheItemPolicy();

                //设置过期时间

                policy.AbsoluteExpiration = DateTimeOffset.Now.AddSeconds(10.0);

                //初始化缓冲项变化检测集合

                var filePaths = new List<string>();

                filePaths.Add(CacheFilePath);

                policy.ChangeMonitors.Add(new HostFileChangeMonitor(filePaths));

                result = File.ReadAllText(CacheFilePath, Encoding.Default) + Environment.NewLine + DateTime.Now.ToString();

                MemoryCache.Default.Set(cacheKey, result, policy);

            }

            return result;

        }

    }

    string cacheFilePath = "e:\\cache\\cacheText.txt";

    var cache = new FileCacheAdapter(cacheFilePath);

    string data = cache.getCache();