In this article, we will explore how to leverage a custom IComparer
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
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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