如果它存在而不是数据库,我如何缓存对象并从内存中读取？

Question

我有四个课程如下:

public class Section
{
    public int SectionId { get; set; }
    public string Name { get; set; }
    public string Title { get; set; }
    public string MetaTag { get; set; }
    public string MetaDescription { get; set; }
    public string UrlSafe { get; set; }
    public string Header { get; set; }
    public string ImageName { get; set; }
}       

public interface ISectionRepository
{
    List<Section> GetAllSections();
}

public class SectionRepository : ISectionRepository
{
    Context context = new Context();

    public List<Section> GetAllSections()
    {
        return context.Sections.ToList();
    }
}

public class SectionApplication
{
    SectionRepository sectionRepo = new SectionRepository();

    public List<Section> GetAllSections()
    {
        return sectionRepo.GetAllSections();
    }
}

在我的控制器中,我有

public class SectionController : Controller
{
    SectionApplication sectionApp = new SectionApplication();

    public ActionResult Index()
    {
        return View(sectionApp.GetAllSections());
    }
}

现在,我想在内存上缓存部分一段特定的时间,以便从缓存中读取部分(如果存在),否则从数据库中读取它.

Answer 1

简单可行的方法,你可以使用MemoryCache,代码如下:

public List<Section> GetAllSections()
    {
        var memoryCache = MemoryCache.Default;

        if (!memoryCache.Contains("section"))
        {
            var expiration = DateTimeOffset.UtcNow.AddMinutes(5);
            var sections = context.Sections.ToList();

            memoryCache.Add("section", section, expiration);
        }

        return memoryCache.Get("section", null);

    }