Question

So I have a class that contains a property called myNumber. It looks like this:

public class MyThing
{
    public int name{ get; set; }
    public string myNumber{ get; set; }
}

The value contained in myNumber can look like this 12-24 or 12-024.

I would like to order a collection of these objects (IEnumerable<MyThing> myCollection) by myNumber descending but I am not sure how to go about doing this.

I tried myCollection.OrderByDescending(f => f.myNumber) but its not quite what I was expecting. I would expect 12-22, 13-01, 12-030 to order like this:

13-01 
12-030
12-22

Answer 1

You can order it like a Version. Therefore you can split by '-' and use the first part as major- and the last part as minor version:

var orderedLikeVersion = myCollection
    .Select(t => new
    {
        Thing = t,
        Parts = t.myNumber.Split('-')
    }).Select(x => new
    {
        x.Thing,
        Version = new Version(int.Parse(x.Parts[0]), int.Parse(x.Parts[1]))
    })
    .OrderByDescending(x => x.Version)
    .Select(x => x.Thing);

Demo with your desired result.