Sorting object list by string property C#

Question

Possible Duplicates:
Sorting a list using Lambda/Linq to objects
C# List<> OrderBy Alphabetical Order

How do I go about sorting a list of objects in alphabetical order by a string property.

I have tried implementing IComparable on the property but I only figured out how to sort on the first character (using char).

EDIT: Here is some sample code.

class MyObject {
    public string MyProperty {get;set;}
}

List<MyObject> sampleList = new List<MyObject>();    

MyObject sample = new MyObject();
sample.MyProperty = "Aardvark";

MyObject sample2 = new MyObject();
sample2.MyProperty = "Zebra";

sampleList.Add(sample);
sampleList.Add(sample2);

sampleList.Sort(); // or something similar

foreach (var item in sampleList) {
    Console.WriteLine(item.MyProperty);
}

Should output Aardvark and Zebra (in alphabetical order).

Thanks!

Maybe this helps http://stackoverflow.com/questions/722868/sorting-a-list-using-lambda-linq-to-objects — evilone, Jul 22 '11 at 13:19

score 22 · Answer 1 · answered Jul 22 '11 at 13:20

22

You can do it using Comparision delegate, using Sort(Comparision<T> comparision) overload.

list.Sort((a, b) =>  a.StringProperty.CompareTo(b.StringProperty));

answered Jul 22 '11 at 13:20

George Polevoy

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dlev · Accepted Answer · 2011-07-22T13:51:13.727

17

You can get a sorted IEnumerable<MyObject> like so:

var sortedQuery = sampleList.OrderBy(x => x.MyProperty);

You can then either convert the query to a list like so:

var sortedList = sortedQuery.ToList();

Or, you can just iterate through the items:

foreach (var obj in sortedQuery)
    Console.WriteLine(obj.MyProperty);

edited Jul 22 '11 at 13:51

answered Jul 22 '11 at 13:18

dlev

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score 4 · Answer 3 · answered Jul 22 '11 at 13:19

4

Assuming that your collection implements the IEnumerable interface, you can simply call the OrderBy method on your collection:

myCollection.OrderBy(c => c.Property);

answered Jul 22 '11 at 13:19

Brian Driscoll

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score 2 · Answer 4 · answered Jul 22 '11 at 13:21

2

var list = new List<SomeClass>();
// add some instances of SomeClass to list
list.Sort((x, y) => x.SomeProperty.CompareTo(y.SomeProperty));

answered Jul 22 '11 at 13:21

jason

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score 2 · Answer 5 · answered Jul 22 '11 at 13:23

Convert the code to C# ,

If you have an list object ABC with a string property S for each objects in the list ,

Dim Mylist As New List(Of ABC)

    Dim a = From i In Mylist _
           Order By i.S Ascending

you will have teh result in a , put on a iterator .

score 0 · Answer 6 · answered Jul 22 '11 at 13:21

0

Be sure to include System.Collections.Generic and System.Linq.

    List<myItemType> lst = new List<myItemType>();
    return lst.OrderBy(i => i.StringPropertyName);

answered Jul 22 '11 at 13:21

Brian

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Hi Jason - it returns an enumerable instance where the enumeration will be ordered. I suppose you could do lst = new List(lst.OrderBy(...)); – Brian Jul 22 '11 at 13:27

Sorting object list by string property C#

6 Answers6