c# - 如何使用 IHttpHandler 启用 OutputCache

Question

我有一个 IHttpHandler，我想连接到 OutputCache 支持，这样我就可以将缓存数据卸载到 IIS 内核。我知道 MVC 必须以某种方式执行此操作，我在 OutputCacheAttribute 中找到了它:

    public override void OnResultExecuting(ResultExecutingContext filterContext) {
        if (filterContext == null) {
            throw new ArgumentNullException("filterContext");
        }

        // we need to call ProcessRequest() since there's no other way to set the Page.Response intrinsic
        OutputCachedPage page = new OutputCachedPage(_cacheSettings);
        page.ProcessRequest(HttpContext.Current);
    }

    private sealed class OutputCachedPage : Page {
        private OutputCacheParameters _cacheSettings;

        public OutputCachedPage(OutputCacheParameters cacheSettings) {
            // Tracing requires Page IDs to be unique.
            ID = Guid.NewGuid().ToString();
            _cacheSettings = cacheSettings;
        }

        protected override void FrameworkInitialize() {
            // when you put the <%@ OutputCache %> directive on a page, the generated code calls InitOutputCache() from here
            base.FrameworkInitialize();
            InitOutputCache(_cacheSettings);
        }
    }

但不确定如何将其应用于 IHttpHandler。尝试过这样的事情，但这当然行不通:

public class CacheTest : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        OutputCacheParameters p = new OutputCacheParameters { Duration = 3600, Enabled = true, VaryByParam = "none", Location = OutputCacheLocation.Server };
        OutputCachedPage page = new OutputCachedPage(p);
        page.ProcessRequest(context);

        context.Response.ContentType = "text/plain";
        context.Response.Write(DateTime.Now.ToString());
        context.Response.End();

    }

    public bool IsReusable
    {
        get
        {
            return true;
        }
    }
}

Answer 1

必须这样做:

public class CacheTest : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        TimeSpan expire = new TimeSpan(0, 0, 5, 0);
        DateTime now = DateTime.Now;
        context.Response.Cache.SetExpires(now.Add(expire));
        context.Response.Cache.SetMaxAge(expire);
        context.Response.Cache.SetCacheability(HttpCacheability.Server);
        context.Response.Cache.SetValidUntilExpires(true);

        context.Response.ContentType = "text/plain";
        context.Response.Write(DateTime.Now.ToString());
    }

    public bool IsReusable
    {
        get
        {
            return true;
        }
    }
}