Linq:按不规则顺序排序

只需创建所需的方法:

class City
{
    public int CarbonId { get; set; }

    public static IOrderedEnumerable OrderByIrregularCarbonId(
         IEnumerable sequence,
         params int[] carbons)
    {
        return sequence.OrderBy(T => Array.IndexOf(carbons, T.CarbonId));
    }
}

public static void Main(string[] args)
{
    int[] carbonOrder = new[] { 3, 6, 2, 7, 9 };

    List cities = City.OrderByIrregularCarbonId(db.GetCities, carbonOrder).ToList();
}