/// <summary>
///
/// </summary>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <param name="variables"></param>
/// <returns></returns>
public static IOrderedQueryable ThenByDescending(this IOrderedQueryable source, string selector, IDictionary <string, dynamic>?variables = null)
{
Check.NotNull(source, nameof(source));
Check.NotEmpty(selector, nameof(selector));
var keySelectorLambda = ExpressionParser.ParseLambda(source.ElementType, selector, variables);
return((IOrderedQueryable)source.CreateQuery(Methods.ThenByDescendingWithSelector, keySelectorLambda));
}