Sort list of object by properties c#

Question

I have this class:

public class Leg
{
    public int Day { get; set; }
    public int Hour { get; set; }
    public int Min { get; set; }
}

I have a function that gets a list of legs, called GetLegs()

List<Leg> legs = GetLegs();

Now I would like to sort this list. So I first have to consider the day, then the hour, and at last the minute. How should I solve this sorting?

Thanks

Why don't you use the native `DateTime` struct? Comparison and therefore sorting supported out of the box. See http://msdn.microsoft.com/en-us/library/system.datetime(v=vs.110).aspx — Călin Darie, Mar 15 '12 at 08:39
By the way - look at the related questions to the right - there's lots of similar threads, you need to learn to search a bit. One for example (first one I looked at)... http://stackoverflow.com/questions/3309188/c-net-how-to-sort-a-list-t-by-a-property-in-the-object — SkonJeet, Mar 15 '12 at 08:54
As you see, it's my first post here, so I will probably get more used to how things work ;) Thanks for the reply anyway, I can't use DateTime in this scenario unfortunately. — Engern, Mar 15 '12 at 15:19

score 10 · Accepted Answer · answered Mar 15 '12 at 08:54

10

Maybe something like this:

List<Leg> legs = GetLegs()
                .OrderBy(o=>o.Day)
                .ThenBy(o=>o.Hour)
                .ThenBy(o=>o.Min).ToList();

answered Mar 15 '12 at 08:54

Arion

31,011
10
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88

score 1 · Answer 2 · answered Mar 15 '12 at 08:40

1

You can write a custom IComparer<Leg> and pass it to the List<T>.Sort method.

Alternatively, you can implement IComparable<Leg> in your class and simply call List<T>.Sort.

answered Mar 15 '12 at 08:40

Matthias

12,053
4
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No need to do even that, he can just write an anonymous lambda in `List.Sort`. – Moo-Juice Mar 15 '12 at 08:41
2

For reasons of code reuse, implementing `IComparable` can be the better alternative if sorting / comparing should happen at more than one location. – Matthias Mar 15 '12 at 08:44

score 1 · Answer 3 · 2012-03-15T09:31:08.790

You need to implement the IComparable<T> interface on your class to allow a more intuitive way for the objects to be sorted in the C# language. When a class implements IComparable, you must also implement the public method CompareTo(T).

Leg class implements IComparable<Leg>, which means an Leg instance can be compared with other Leg instances.

    #region "Leg Class that implements IComparable interface"
    public class Leg:IComparable<Leg>
    {
        public int Day { get; set; }
        public int Hour { get; set; }
        public int Min { get; set; }

        public int CompareTo(Leg leg)
        {
            if (this.Day == leg.Day)
            {
                if (this.Hour == leg.Hour)
                {
                    return this.Min.CompareTo(leg.Min);
                }
            }
            return this.Day.CompareTo(leg.Day);
        }
    }
    #endregion


   //Main code
   List<Leg> legs = GetLegs();
   legs.Sort();

score 0 · Answer 4 · answered Mar 15 '12 at 08:41

0

Use Enumerable.OrderBy Method.

answered Mar 15 '12 at 08:41

Zabavsky

13,340
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score 0 · Answer 5 · answered Mar 15 '12 at 08:51

0

I guess this would help.

var o = legs.OrderBy(x => x.Day)
            .ThenBy(x => x.Hour)
            .ThenBy(x => x.Min);

answered Mar 15 '12 at 08:51

Sreedharlal B Naick

156
7

Sort list of object by properties c#

5 Answers5

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