internal static void EnsureValidPageType(WebPageBase page, string virtualPath)
{
bool error = true;
try {
if (page.FileExists(virtualPath))
{
var factory = page.GetObjectFactory(virtualPath);
if (factory != null)
{
var result = factory();
if (result != null && typeof(WebPageBase).IsAssignableFrom(result.GetType()))
{
error = false;
}
}
}
}
catch (HttpException e) {
// If the path uses an unregistered extension, such as Foo.txt,
// then an error regarding build providers will be thrown.
// Check if this is the case and throw a simpler error.
ThrowIfUnsupportedExtension(virtualPath, e);
// If the path uses an extension registered with codedom, such as Foo.js,
// then an unfriendly compilation error might get thrown by the underlying compiler.
// Check if this is the case and throw a simpler error.
ThrowIfCodeDomDefinedExtension(virtualPath, e);
// Rethrow any errors
throw;
}
if (error)
{
// The page is missing, could not be compiled or is of an invalid type.
throw new HttpException(String.Format(CultureInfo.CurrentCulture, WebPageResources.WebPage_InvalidPageType, virtualPath));
}
}
