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How to Sort a List Using a Custom IComparer with LINQ OrderBy?

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2025-01-03 09:49:40665browse

How to Sort a List Using a Custom IComparer with LINQ OrderBy?

Using Custom IComparer in Linq OrderBy

In this article, we will explore how to leverage a custom IComparer interface with LINQ OrderBy to achieve specific sorting behavior.

The scenario presented involves a generic list containing objects with an InvoiceNumber property formatted as "200906/1". The goal is to sort this list according to a custom sorting logic that considers the numerical values within the InvoiceNumber property.

Initially, a custom IComparer class named MyComparer was implemented. However, the sorting results were unsatisfactory, as it sorted based on the default text ordering, rather than the intended numerical comparison.

The corrected MyComparer implementation is provided below:

public class MyComparer : IComparer<Object>
{
    public int Compare(Object stringA, Object stringB)
    {
        string[] valueA = stringA.ToString().Split('/');
        string[] valueB = stringB.ToString().Split('/');

        if (valueA.Length != 2 || valueB.Length != 2)
        {
            return stringA.ToString().CompareTo(stringB.ToString());
        }

        // Note: do error checking and consider i18n issues too :)
        if (valueA[0] == valueB[0]) 
        {
            return int.Parse(valueA[1]).CompareTo(int.Parse(valueB[1]));
        }
        else
        {
            return int.Parse(valueA[0]).CompareTo(int.Parse(valueB[0]));
        }
    }
}

The ApplySortCore method was modified to utilize the MyComparer:

case ListSortDirection.Ascending:
    MyComparer comparer = new MyComparer();
    items = items.OrderByDescending(
              x => property.GetValue(x), comparer).ToList();
    break;

Finally, to ensure that the sorted list is reflected in the bound list, the updated items collection must be assigned to the Items property:

this.Items = items;

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Object sort using class Interface finally Property Collection Generic default this linq
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