Asp.Net Core：在控制器外部使用内存缓存

问题描述

在ASP.NET Core中，非常容易从控制器访问您的内存缓存

In ASP.NET Core its very easy to access your memory cache from a controller

在启动时添加：

public void ConfigureServices(IServiceCollection services)
        {
             services.AddMemoryCache();
        }

，然后从您的控制器中

[Route("api/[controller]")]
public class MyExampleController : Controller
{
    private IMemoryCache _cache;

    public MyExampleController(IMemoryCache memoryCache)
    {
        _cache = memoryCache;
    }

    [HttpGet("{id}", Name = "DoStuff")]
    public string Get(string id)
    {
        var cacheEntryOptions = new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromHours(1));
        _cache.Set("key", "value", cacheEntryOptions);
    }
}

但是，如何在外部访问相同的内存缓存控制器的。例如。我有一个由HangFire启动的计划任务，如何从我通过HangFire计划任务启动的代码中访问内存缓存？

But, how can I access that same memory cache outside of the controller. eg. I have a scheduled task that gets initiated by HangFire, How do I access the memorycache from within my code that starts via the HangFire scheduled task?

public class ScheduledStuff
{
    public void RunScheduledTasks()
    {
        //want to access the same memorycache here ...
    }
}

推荐答案

内存缓存实例可以注入到任何组件中由DI容器控制；这意味着您需要在 ConfigureServices 方法中配置 ScheduledStuff 实例：

Memory cache instance may be injected to the any component that is controlled by DI container; this means that you need configure ScheduledStuff instance in the ConfigureServices method:

public void ConfigureServices(IServiceCollection services) {
  services.AddMemoryCache();
  services.AddSingleton<ScheduledStuff>();
}

，并在ScheduledStuff构造函数中将IMemoryCache声明为依赖项：

and declare IMemoryCache as dependency in ScheduledStuff constructor:

public class ScheduledStuff {
  IMemoryCache MemCache;
  public ScheduledStuff(IMemoryCache memCache) {
    MemCache = memCache;
  }
}

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