private static string GetCacheKeyFromVirtualPath(VirtualPath virtualPath, out bool keyFromVPP) {
// Check if the VirtualPathProvider needs to use a non-default cache key
string key = virtualPath.GetCacheKey();
// If so, just return it
if (key != null) {
keyFromVPP = true;
return key.ToLowerInvariant();
}
// The VPP didn't return a key, so use our standard key algorithm
keyFromVPP = false;
// Check if the key for this virtual path is already cached
key = _keyCache[virtualPath.VirtualPathString] as string;
if (key != null) return key;
// Compute the key
key = GetCacheKeyFromVirtualPathInternal(virtualPath);
// The key should always be lower case
Debug.Assert(key == key.ToLowerInvariant());
// Cache it for next time
_keyCache[virtualPath.VirtualPathString] = key;
return key;
}
