ChildActionOnly 输出缓存未禁用

Question

我在标有[ChildActionOnly] 的控制器中有以下操作：

[OutputCache(Duration = 3600)]
public PartialViewResult SideNavigation()
{
    SideNavigationModel model = _sideNavigationFactory.GetSideNavigation();

    if (model != null)
    {
        return PartialView(model);
    }

    return default(PartialViewResult);
}

当我调用它时效果很好：

@Html.Action("SideNavigation", "Template") 

在我的主模板中。但是我注意到，当我更新侧面导航的 cshtml 文件时，即使在 web.config 中禁用了输出缓存，它也不会在网页上更新：

<outputCache enableOutputCache="false">

如果我更改打开的主模板，该模板会更新，但模板的导航部分不会。这是预期的行为吗？如果是这样，是否有办法仅在启用输出缓存时才输出缓存？

Answer 1

using System.Web.Configuration;
using System.Web.Mvc;

namespace Mvc.Filters
{
    public class ExtendedOutputCacheAttribute : OutputCacheAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (!web.config.caching.disabled) // just read the right config setting somewhere 
            {
               base.OnActionExecuting(filterContext);
            }
        }
    }
}

Answer 2

感谢this answer 和 Laurent 提供的答案的混合，我使用自定义属性提出了以下解决方案：

public class ChildActionOutputCacheAttribute : OutputCacheAttribute
{
    private const string _cachingSection = "system.web/caching/";
    private const string _outputCacheSection = "outputCache";
    private const string _profileSection = "outputCacheSettings";
    private bool _profileEnabled;

    public ChildActionOutputCacheAttribute(string cacheProfile)
    {
        // get output cache section of web config
        OutputCacheSection settings = (OutputCacheSection)WebConfigurationManager.GetSection($"{_cachingSection}{_outputCacheSection}");

        // check section exists and caching is enabled
        if (settings != null && settings.EnableOutputCache)
        {
            // if caching enabled, get profile
            OutputCacheSettingsSection profileSettings = (OutputCacheSettingsSection)WebConfigurationManager.GetSection($"{_cachingSection}{_profileSection}");
            OutputCacheProfile profile = profileSettings.OutputCacheProfiles[cacheProfile];

            if (profile != null && profile.Enabled)
            {
                // if profile exits set profile params
                Duration = profile.Duration;
                VaryByParam = profile.VaryByParam;
                VaryByCustom = profile.VaryByCustom;

                _profileEnabled = true;           // set profile enable to true as output cache is turned on and there is a profile
            }
        }
    }

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (_profileEnabled)
        {
            // only run this if caching has been set and is enabled
            base.OnActionExecuting(filterContext);
        }
    }
}

然后可以使用以下命令将其添加到子操作控制器中：

[ChildActionOutputCache(CacheProfile.Long)]

如果您的 web.config 中有以下部分：

<system.web>
  <caching>
    <outputCache enableOutputCache="false"></outputCache>
    <outputCacheSettings>
      <outputCacheProfiles>
        <add name="Long" duration="86400" varyByParam="*" varyByHeader="none" location="Server" />
      </outputCacheProfiles>
    </outputCacheSettings>
  </caching>
</system.web>