Why is my List.Sort method in C# reversing the order of my list?

Posted by Fiona Holder on Stack Overflow See other posts from Stack Overflow or by Fiona Holder
Published on 2010-04-20T10:26:35Z Indexed on 2010/04/20 10:33 UTC
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Filed under:

c#

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.NET

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sorting

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icomparable

I have a list of items in a generic list:

A1 (sort index 1)
A2 (sort index 2)
B1 (sort index 3)
B2 (sort index 3)
B3 (sort index 3)

The comparator on them takes the form:

this.sortIndex.CompareTo(other.sortIndex)

When I do a List.Sort() on the list of items, I get the following order out:

A1
A2
B3
B2
B1

It has obviously worked in the sense that the sort indexes are in the right order, but I really don't want it to be re-ordering the 'B' items.

Is there any tweak I can make to my comparator to fix this?

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