ASP.NET Core中的Caching组件简介_实用技巧_

services.AddMemoryCache(); services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

 private IMemoryCache memoryCache; public HomeController( IMemoryCache _memoryCache) { memoryCache = _memoryCache; } public IActionResult Index() { string cacheKey = "key"; string result; if (!memoryCache.TryGetValue(cacheKey, out result)) { result = $"LineZero{DateTime.Now}"; memoryCache.Set(cacheKey, result); //设置相对过期时间 memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions() .SetSlidingExpiration(TimeSpan.FromSeconds(10))); //设置绝对过期时间 memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions() .SetAbsoluteExpiration(TimeSpan.FromSeconds(10))); //删除缓存 memoryCache.Remove(cacheKey); //设置缓存优先级（程序压力大时，会根据优先级自动回收） memoryCache.Set(cacheKey,result,new MemoryCacheEntryOptions() .SetPriority(CacheItemPriority.NeverRemove)); //过期时缓存回调 memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions() .SetAbsoluteExpiration(TimeSpan.FromSeconds(60)) .RegisterPostEvictionCallback((key, value, reason, substate) => { nlog.Warn($"键{key}值{value}改变,因为{reason}"); })); //Token过期时，缓存回调 var cts = new CancellationTokenSource(); memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions() .AddExpirationToken(new CancellationChangeToken(cts.Token)) .RegisterPostEvictionCallback((key, value, reason, substate) => { nlog.Warn($"键{key}值{value}改变,因为{reason}"); })); } ViewBag.Cache = result; return View(); }

@{ ViewData["Title"] = "Home Page"; } 
缓存项10秒过期(expires-after绝对过期时间)
相对十秒(expires-sliding相对过期时间)
 @DateTime.Now 
@ViewBag.Cache