public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext == null)
{
throw new ArgumentNullException("filterContext");
}
if (filterContext.IsChildAction)
{
ValidateChildActionConfiguration();
// Already actively being captured? (i.e., cached child action inside of cached child action)
// Realistically, this needs write substitution to do properly (including things like authentication)
if (GetChildActionFilterFinishCallback(filterContext) != null)
{
throw new InvalidOperationException(MvcResources.OutputCacheAttribute_CannotNestChildCache);
}
// Already cached?
string uniqueId = GetChildActionUniqueId(filterContext);
string cachedValue = ChildActionCacheInternal.Get(uniqueId) as string;
if (cachedValue != null)
{
filterContext.Result = new ContentResult()
{
Content = cachedValue
};
return;
}
// Swap in a new TextWriter so we can capture the output
StringWriter cachingWriter = new StringWriter(CultureInfo.InvariantCulture);
TextWriter originalWriter = filterContext.HttpContext.Response.Output;
filterContext.HttpContext.Response.Output = cachingWriter;
// Set a finish callback to clean up
SetChildActionFilterFinishCallback(filterContext, wasException =>
{
// Restore original writer
filterContext.HttpContext.Response.Output = originalWriter;
// Grab output and write it
string capturedText = cachingWriter.ToString();
filterContext.HttpContext.Response.Write(capturedText);
// Only cache output if this wasn't an error
if (!wasException)
{
ChildActionCacheInternal.Add(uniqueId, capturedText, DateTimeOffset.UtcNow.AddSeconds(Duration));
}
});
}
}
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//Immediatly return if cache is disabled from admin
if (!SettingsHelper.OutputCacheEnabled)
{
return;
}
if (filterContext == null)
{
throw new ArgumentNullException("filterContext");
}
var configSection = (OutputCacheSection)ConfigurationManager.GetSection("system.web/caching/outputCache");
if (configSection.EnableOutputCache)
{
if (filterContext.IsChildAction && SettingsHelper.ChildOutputCacheEnabled)
{
ValidateChildActionConfiguration();
// Already actively being captured? (i.e., cached child action inside of cached child action)
// Realistically, this needs write substitution to do properly (including things like authentication)
if (GetChildActionFilterFinishCallback(filterContext) != null)
{
throw new InvalidOperationException("Cannot nest child cache");
}
// Already cached?
var uniqueId = GetChildActionUniqueId(filterContext);
var cachedValue = ChildActionCacheInternal.Get(uniqueId) as string;
if (cachedValue != null)
{
filterContext.Result = new ContentResult {
Content = cachedValue
};
return;
}
// Swap in a new TextWriter so we can capture the output
var cachingWriter = new StringWriter(CultureInfo.InvariantCulture);
var originalWriter = filterContext.HttpContext.Response.Output;
filterContext.HttpContext.Response.Output = cachingWriter;
// Set a finish callback to clean up
SetChildActionFilterFinishCallback(filterContext, wasException =>
{
// Restore original writer
filterContext.HttpContext.Response.Output = originalWriter;
// Grab output and write it
string capturedText = cachingWriter.ToString();
filterContext.HttpContext.Response.Write(capturedText);
// Only cache output if this wasn't an error
if (!wasException)
{
ChildActionCacheInternal.Add(uniqueId, capturedText, DateTimeOffset.UtcNow.AddSeconds(Duration));
}
});
}
}
}