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ASP.NET?Core中的Caching組件簡介_實(shí)用技巧

作者:Ruby_Lu ? 更新時(shí)間: 2022-06-13 編程語言

在.NET Core中提供了Caching的組件。目前Caching組件提供了三種存儲(chǔ)方式:

  • Memory
  • Redis
  • SQLSever

1.Memeor Caching

新建一個(gè)ASP.NET Core Web應(yīng)用程序項(xiàng)目,然后安裝 Microsoft.Extensions.Caching.Memory。

修改ConfigureServices方法

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

在HomeController使用:

        private IMemoryCache memoryCache;
        public HomeController( IMemoryCache _memoryCache)
        {
            memoryCache = _memoryCache;
        }

        public IActionResult Index()
        {
            string cacheKey = "key";
            string result;
            if (!memoryCache.TryGetValue(cacheKey, out result))
            {
                result = $"LineZero{DateTime.Now}";
                memoryCache.Set(cacheKey, result);
                //設(shè)置相對(duì)過期時(shí)間
                memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
                    .SetSlidingExpiration(TimeSpan.FromSeconds(10)));
                //設(shè)置絕對(duì)過期時(shí)間
                memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
                    .SetAbsoluteExpiration(TimeSpan.FromSeconds(10)));
                //刪除緩存
                memoryCache.Remove(cacheKey);
                //設(shè)置緩存優(yōu)先級(jí)(程序壓力大時(shí),會(huì)根據(jù)優(yōu)先級(jí)自動(dòng)回收)
                memoryCache.Set(cacheKey,result,new MemoryCacheEntryOptions() 
                    .SetPriority(CacheItemPriority.NeverRemove));
                //過期時(shí)緩存回調(diào)
                memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
                    .SetAbsoluteExpiration(TimeSpan.FromSeconds(60))
                    .RegisterPostEvictionCallback((key, value, reason, substate)
                    =>
                    {
                        nlog.Warn($"鍵{key}值{value}改變,因?yàn)閧reason}");
                    }));
                //Token過期時(shí),緩存回調(diào)
                var cts = new CancellationTokenSource();
                memoryCache.Set(cacheKey, result, new MemoryCacheEntryOptions()
                    .AddExpirationToken(new CancellationChangeToken(cts.Token))
                    .RegisterPostEvictionCallback((key, value, reason, substate)
                    =>
                    {
                        nlog.Warn($"鍵{key}值{value}改變,因?yàn)閧reason}");
                    }));
            }
            ViewBag.Cache = result;
            return View();
        }

2.Distributed Cache Tag Helper

在ASP.NET Core MVC 中有一個(gè) Distributed Cache Tag Helper,它是依賴于MemoryCache組件的。

可以直接在試圖上增加 distributed-cache 標(biāo)簽

@{
    ViewData["Title"] = "Home Page";
}
<distributed-cache name="mycache" expires-after="TimeSpan.FromSeconds(10)">
    <p>緩存項(xiàng)10秒過期(expires-after絕對(duì)過期時(shí)間)</p>
</distributed-cache>
<distributed-cache name="mycachenew" expires-sliding="TimeSpan.FromSeconds(10)">
    <p>相對(duì)十秒(expires-sliding相對(duì)過期時(shí)間)</p>
    @DateTime.Now
</distributed-cache>
<div>@ViewBag.Cache</div>

原文鏈接:https://www.cnblogs.com/afei-24/p/11000367.html

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