Sorting an object list

Question

I am keeping a list of objects in a List(). I want to sort this list by a property of the object.

For example, say the object is a Messsage and message has: content, date, header, ...

I want to sort the list by the message's date.

Is there any List method or any other method that makes this sort easy?

Thanks.

This is a duplicate of This Question

Bob Vale
– Bob Vale

2011-08-04 07:45:22 +00:00
Commented Aug 4, 2011 at 7:45 — Bob Vale
– Bob Vale, Commented Aug 4, 2011 at 7:45

Petar Ivanov · Accepted Answer · 2011-08-04 07:43:41Z

2

Yeah, use sort. If your list is l:

l.Sort((a,b) => {
    if (a == b) return 0;
    if (a == null) return -1;
    if (b == null) return 1;

    return a.Date.CompareTo(b.Date)
});

This assumes that the date property is of type that implements CompareTo().

edited Aug 4, 2011 at 7:43

answered Aug 4, 2011 at 7:33

Petar Ivanov

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2 Comments

Petar Ivanov Over a year ago

no need to check for b - the compareTo should handle it if implemented correctly

Bob Vale Over a year ago

Nope, because you are passing in b.Date so if b==null then you will get a NullReferenceException

Haris Hasan · Accepted Answer · 2011-08-04 07:34:24Z

0

You can implement IComparer<YourObject> and use that comparer for sorting

answered Aug 4, 2011 at 7:34

Haris Hasan

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Comments

Community · Accepted Answer · 2017-05-23 09:58:56Z

0

If you are using generics (ie using List) you can use the Sort method MSDN

See my answer ot this question for out to create an extension method that lets you do

myList.SortBy(x=>x.Date)

edited May 23, 2017 at 9:58

CommunityBot

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answered Aug 4, 2011 at 7:36

Bob Vale

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