/// <summary>
/// Include a stylesheet to fallback to when external CdnPath does not load.
/// </summary>
/// <param name="bundle"></param>
/// <param name="fallback">Virtual path to fallback stylesheet</param>
/// <param name="className">Stylesheet class name applied to test DOM element</param>
/// <param name="ruleName">Rule name to test when the class is applied ie. width</param>
/// <param name="ruleValue">Value to test when the class is applied ie. 1px</param>
/// <returns></returns>
public static StyleBundle IncludeFallback(this StyleBundle bundle, string fallback,
string className = null, string ruleName = null, string ruleValue = null)
{
if (String.IsNullOrEmpty(bundle.CdnPath))
{
throw new Exception("CdnPath must be provided when specifying a fallback");
}
if (VirtualPathUtility.IsAppRelative(bundle.CdnPath))
{
bundle.CdnFallbackExpress(fallback);
}
else if (new[] { className, ruleName, ruleValue }.Any(String.IsNullOrEmpty))
{
throw new Exception(
"IncludeFallback for cross-domain CdnPath must provide values for parameters [className, ruleName, ruleValue].");
}
else
{
bundle.CdnFallbackExpress(fallback, className, ruleName, ruleValue);
}
return(bundle);
}
