【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);
             }