每个用户的输出缓存 [英] Output cache per User

问题描述

喜有相当内存密集型的仪表板是每个用户不同。我如何缓存基于登录用户ID当前未作为参数传递，但需要从登录的用户目前得到的响应。这是我的理解的VaryByParam着眼于请求上下文

Hi have quite a memory intensive dashboard which is different per user. How do I cache the response based on the current logged in userID which is not passed as a parameter but needs to be derived from the current logged in user. It is my understanding VaryByParam looks at the request context

也有是，当这个被改变缓存需要被重置在数据库中的值

Also there is a value in the database that when this is changed the cache needs to be reset

推荐答案

在你的的Web.config ：

<caching>
  <outputCacheSettings>
    <outputCacheProfiles>
      <add name="Dashboard" duration="86400" varyByParam="*" varyByCustom="User" location="Server" />
    </outputCacheProfiles>
  </outputCacheSettings>
</caching>

在你的控制器 / 动作：

[OutputCache(CacheProfile="Dashboard")]
public class DashboardController : Controller { ...}

然后在你的的Global.asax ：

    //string arg filled with the value of "varyByCustom" in your web.config
    public override string GetVaryByCustomString(HttpContext context, string arg)
    {
        if (arg == "User")
             {
             // depends on your authentication mechanism
             return "User=" + context.User.Identity.Name;
             //?return "User=" + context.Session.SessionID;
             }

        return base.GetVaryByCustomString(context, arg);
    }

在本质上， GetVaryByCustomString 将让你写一个自定义的方法来确定是否会有一个缓存按 / 通过返回将被用来作为某种每个缓存副本的哈希的字符串错过。

In essence, GetVaryByCustomString will let you write a custom method to determine whether there will be a Cache hit / miss by returning a string that will be used as some sort of a 'hash' per Cache copy.

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