通过枚举对LINQ表达式的结果进行排序

Question

I have the following model entity:

public class Itinerary 
{
    public int Id {get; set }
    public DateTime? Date { get; set; }
    public EnumType Type { get; set; }
}

public enum EnumType
{
    Start,
    Intermediary,
    End
}

I would like to sort first based on the Enum (property named Type ) then based on the DateTime (property named Date ). I already tried the expression below but this is not ordered by Type first

var itineraries = t.Itineraries.OrderBy(x => x.Type).OrderBy(x => x.Date).ToList();

How to order results of my LINQ expression, first by Type (order: Start, Intermediary, End) then by Date ?

The reason is because sometimes there are no dates defined then I need to sort by type.

Answer 1

使用ThenBy进一步排序：

var itineraries = t.Itineraries.OrderBy(x => x.Type).ThenBy(x => x.Date).ToList();