Parameter Value aus Url per Extension-Method ermitteln

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public static string ParameterValue(this Uri uri, string paramName)
{
	if (uri != null && uri.Query != null && uri.Query.Length > 0 && uri.Query.ToLower().Contains(paramName)) 
	{
		Match m = Regex.Match(uri.Query, "^?" + paramName + "=([^&#]*)");
		if(m.Success) return m.Value.Replace(paramName + "=", "");
	}
	return "";
}