【wpf】缓存

1、引用 System.Runtime.Caching

2、源 msdn

//实例化MemoryCache类
            ObjectCache cache = MemoryCache.Default;
            //读取缓存
            string fileContents = cache["filecontents"] as string;
            if (fileContents == null)
            {
                StringBuilder strb = new StringBuilder();
                path = AppDomain.CurrentDomain.BaseDirectory + "Resources/caching.txt";
                //读取文件内容
                StreamReader sr = new StreamReader(path, Encoding.Default);
                String line;
                while ((line = sr.ReadLine()) != null)
                {
                    strb.Append(line.ToString());
                }
                fileContents = strb.ToString() + "---" + DateTime.Now;
                //设置缓存过期时间
                CacheItemPolicy policy = new CacheItemPolicy();
                policy.AbsoluteExpiration = DateTimeOffset.Now.AddSeconds(10.0);

                List<string> filePaths = new List<string>();
                filePaths.Add(path);
                //添加缓存
                cache.Set("filecontents", fileContents, policy);
            }