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.NET Forum / Languages / C# / November 2006ArrayList sorting on stronged typed objects
If I have class Student { public string LastName public string FirstName public int Age; public int ID; } and I have an ArrayList that's storing only Student objects, how can I sort the ArrayList by LastName? Using a IComparer class appears to only allow < > comparisons on a numeric field... Use IComparable. Or even simpler, here's an article that will show you how to sort on anything... or everything... http://ianfnelson.com/blog/archive/2006/02/27/UniversalComparer.aspx Dale  SignatureDale Preston MCAD C# MCSE, MCDBA > If I have > [quoted text clipped - 9 lines] > sort the ArrayList by LastName? Using a IComparer class appears to only > allow < > comparisons on a numeric field... JDeats, You investigated already the power of the DataTable Class, it is completely build in, so very cheap to use and can used to be inherited and than completely strongly typed. Cor > If I have > [quoted text clipped - 9 lines] > sort the ArrayList by LastName? Using a IComparer class appears to only > allow < > comparisons on a numeric field... > If I have > [quoted text clipped - 9 lines] > sort the ArrayList by LastName? Using a IComparer class appears to only > allow < > comparisons on a numeric field... No, IComparer is the way to go here - just return the value of x.LastName.CompareTo(y.LastName); SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too Actually, CompareTo() is defined in IComparable. IComparer defines Compare(). SignatureDale Preston MCAD C# MCSE, MCDBA > > If I have > > [quoted text clipped - 12 lines] > No, IComparer is the way to go here - just return the value of > x.LastName.CompareTo(y.LastName); > Actually, CompareTo() is defined in IComparable. IComparer defines > Compare(). Indeed - but I was suggesting calling String.CompareTo when implementing Compare. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet If replying to the group, please do not mail me too >If I have > [quoted text clipped - 9 lines] >sort the ArrayList by LastName? Using a IComparer class appears to only >allow < > comparisons on a numeric field... Have a look at this: http://www.otismukinfus.com/vault/vault.htm Good luck with your project, Otis Mukinfus http://www.arltex.com http://www.tomchilders.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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