Sorting a list in C# with Icomparer

Question

I want to sort the items in a combobox on the object.Frequency. I did some research and then I made this class:

 public class CompareByFrequency : IComparer<GenderFrequency>
 {
    public int Compare(GenderFrequency x, GenderFrequency y)
    {
        return x.Frequency.CompareTo(y.Frequency);
    }

    public static void QSFreq(List<GenderFrequency> g)
    {
        g.Sort(new CompareByFrequency());
    }
}

Then, to put my objects in the combobox (unsorted) I use:

private void showGenderfreq()
{
    cboGenderFreqs.Items.Clear();
    foreach (GenderFrequency gf in GenderFrequency.GenderFrequencies(
             Bird.getBirdFromCSV(txtFile.Text)))
    {
        cboGenderFreqs.Items.Add(gf);
    }
}

But obviously I want that combobox to be sorted to Frequency. Where it is now:

Accipiter(2)
Allauda (1)
Anas (6) ...

it Should be

Anas(6)
Accipiter(2)
Allauda(1)

Thank you in advance

What is `Frequency.CompareTo`? What is the type of `Frequency`? — Oded, Sep 03 '13 at 09:10
What does your GenderFrequency-class look like? Can't you just do `OrderBy()`? — Abbas, Sep 03 '13 at 09:12
it's `(x.Frequency).compareTo(y.Freequency)` Frequency is an integer, calculated in the class GenderFrequencies, it's the amount of times a given gender appears in my CSV Here, for instance it returns 6 on the gender Anas — user2740565, Sep 03 '13 at 09:15
Check if you can sort them by typping this: cboGenderFreqs.Items.Sort(new CompareByFrequency()); — Paweł Reszka, Sep 03 '13 at 09:20
Yes, It returns the items from a List `GenderFrequency` I generated — user2740565, Sep 03 '13 at 09:20
Why have done a `static` method to sort a list ? as you can simply do `myList.Sort( new CompareByFrequency() )` — polkduran, Sep 03 '13 at 09:26

score 1 · Answer 1 · answered Sep 03 '13 at 09:21

1

Well, wouldn't it be easier to do

cboGenderFreqs.Items.Clear();
cboGenderFreqs.Items.AddRange(
   GenderFrequency.GenderFrequencies.OrderByDescending(gf => gf.Frequency)
   .ToArray());

answered Sep 03 '13 at 09:21

Jodrell

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Sorting a list in C# with Icomparer

1 Answers1