void Pipeline_Rewrite(System.Web.IHttpModule sender, System.Web.HttpContext context, IUrlEventArgs e)
{
var os = provider.GetOverlays(e.VirtualPath, e.QueryString);
if (os == null)
{
return;
}
long hash = 0xab224895;
int offset = 0;
foreach (Overlay o in os)
{
int ohash = o.GetDataHashCode();
string physicalPath = HostingEnvironment.MapPath(o.OverlayPath);
try{
ohash ^= (int)(File.GetLastWriteTimeUtc(physicalPath).Ticks / (TimeSpan.TicksPerMillisecond * 5));
}catch {}
hash ^= ohash << (offset % 50);
offset += 31;
}
//Store a hash of all the overlays, so the disk cache updates when an overlay changes
e.QueryString["customoverlay.hash"] = hash.ToString();
//And save the overlays for later
RequestOverlays = os;
}
