public static IDocumentationProviderEx GetDocumentationProviderEx(this ServicesContainer container)
{
var result = container.GetDocumentationProvider() as IDocumentationProviderEx;
if (result == null)
{
var msg = string.Format("{0} is not registered as {1} service provider.",
typeof(WebApiHtmlDocumentationProvider),
typeof(IDocumentationProvider));
throw new InvalidOperationException(msg);
}
return(result);
}