我有一个ASP.NET MVC应用程序。我需要缓存一些页面,但是,对于未经认证的用户,只有。
我尝试在下面的GetVaryByCustomString
实现中使用VaryByCustom="user"
:
public override string GetVaryByCustomString(HttpContext context, string custom)
{
if (custom == "user")
{
if (context.User.Identity.IsAuthenticated)
{
return context.User.Identity.Name;
}
else
{
return "";
}
}
return base.GetVaryByCustomString(context, custom);
}
然而,这并不是我所需要的,因为页面仍然被缓存。唯一不同的是,现在为每个用户单独缓存。
一种可能的解决方案是每次用户通过身份验证时都返回Guid.NewGuid()
,但在我看来这是对资源的巨大浪费。
你有什么建议给我吗?
发布于 2010-01-23 02:18:42
下面是我所做的:
public class NonAuthenticatedOnlyCacheAttribute : OutputCacheAttribute
{
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
var httpContext = filterContext.HttpContext;
if (httpContext.User.Identity.IsAuthenticated)
{
// it's crucial not to cache Authenticated content
Location = OutputCacheLocation.None;
}
// this smells a little but it works
httpContext.Response.Cache.AddValidationCallback(IgnoreAuthenticated, null);
base.OnResultExecuting(filterContext);
}
// This method is called each time when cached page is going to be
// served and ensures that cache is ignored for authenticated users.
private void IgnoreAuthenticated(HttpContext context, object data, ref HttpValidationStatus validationStatus)
{
if (context.User.Identity.IsAuthenticated)
validationStatus = HttpValidationStatus.IgnoreThisRequest;
else
validationStatus = HttpValidationStatus.Valid;
}
}
非常感谢Craig Stuntz,他为我指明了正确的方向,我在不知不觉中否决了他的答案。
发布于 2012-03-14 10:03:11
属性一般都是缓存的,然后你需要存储原始位置。如果您访问记录的页面,它会将位置设置为None,然后当您以匿名身份访问时,它仍然为None。
public class AuthenticatedOnServerCacheAttribute : OutputCacheAttribute
{
private OutputCacheLocation? originalLocation;
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
var httpContext = filterContext.HttpContext;
if (httpContext.User.Identity.IsAuthenticated)
{
originalLocation = originalLocation ?? Location;
Location = OutputCacheLocation.None;
}
else
{
Location = originalLocation ?? Location;
}
base.OnResultExecuting(filterContext);
}
}
发布于 2012-04-25 21:00:36
公认的答案是正确的,但它不适用于以这种方式缓存部分视图。我组合了这两种方法:GetVaryByCustomString
和set Duration
to the minimum -用于局部视图,AddValidationCallback
方法用于页面。实际上,只使用第一种方法是可能的,但第二种方法看起来不是很昂贵-它不会每次都调用OnResultExecuting
,而只调用已注册的处理程序。
因此,自定义缓存属性类
public class CacheAttribute : OutputCacheAttribute
{
public CacheAttribute()
{
Duration = 300; /*default cache time*/
}
private bool _partialView;
/// <summary>
/// Set true if Partial view is cached
/// </summary>
public bool PartialView
{
get { return _partialView; }
set
{
_partialView = value;
if ( _partialView ) {
VaryByCustom = "Auth";
}
}
}
public override void OnResultExecuting(ResultExecutingContext filterContext)
{
if ( PartialView ) OnCachePartialEnabled( filterContext );
else OnCacheEnabled(filterContext);
base.OnResultExecuting( filterContext );
}
private OutputCacheLocation? originalLocation;
private int? _prevDuration;
protected void OnCachePartialEnabled(ResultExecutingContext filterContext)
{
var httpContext = filterContext.HttpContext;
if ( !_prevDuration.HasValue) _prevDuration = Duration;
Duration = httpContext.User.Identity.IsAuthenticated ? 1 : _prevDuration.Value;
}
protected void OnCacheEnabled(ResultExecutingContext filterContext)
{
var httpContext = filterContext.HttpContext;
if ( httpContext.User.Identity.IsAuthenticated ) {
// it's crucial not to cache Authenticated content
originalLocation = originalLocation ?? Location;
Location = OutputCacheLocation.None;
}
else {
Location = originalLocation ?? Location;
}
// this smells a little but it works
httpContext.Response.Cache.AddValidationCallback( IgnoreAuthenticated, null );
}
// This method is called each time when cached page is going to be
// served and ensures that cache is ignored for authenticated users.
private void IgnoreAuthenticated(HttpContext context, object data, ref HttpValidationStatus validationStatus)
{
validationStatus = context.User.Identity.IsAuthenticated
? HttpValidationStatus.IgnoreThisRequest
: HttpValidationStatus.Valid;
}
}
覆盖Global.asax.cs中的GetVaryByCustomString方法
public override string GetVaryByCustomString(HttpContext context, string custom)
{
if ( custom == "Auth" ) {
//do not cache when user is authenticated
if ( context.User.Identity.IsAuthenticated ) {
return base.GetVaryByCustomString( context, custom );
}
return "NotAuth";
}
return base.GetVaryByCustomString( context, custom );
}
像这样使用它:
[Cache]
public virtual ActionResult Index()
{
return PartialView();
}
[ChildActionOnly, Cache(PartialView=true)]
public virtual ActionResult IndexPartial()
{
return PartialView();
}
更新:我还在这里添加了Fujiy的修复
https://stackoverflow.com/questions/2109928
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