Sorting a Generic List

[Juice05]

I have a Generic List of Invoices (Custom class). Each Invoice has a header class and a list of lineitems, which is also a class.

How can i sort the List of invoices by a value that is found in the header class?

Invoice 1
HeaderInfo - InvoiceID DateCreated CreatedBy
LineItemInfo - CustomerID Amount
LineItemInfo - CustomerID Amount
LineItemInfo - CustomerID Amount
Invoice 2
HeaderInfo - InvoiceID DateCreated CreatedBy
LineItemInfo - CustomerID Amount
LineItemInfo - CustomerID Amount

I would like to sort my Invoice list by the DateCreated in the header of each invoice.

 

[ca8msm]

I think you should be able to use the IComparer class and implement that.


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[dragonwell]

Yep, implement IComparer(of T). Something like this:

Public Class InvoiceSorter
    Implements IComparer(of Invoice)

    Public Function Compare(ByVal x As Invoice, ByVal y As Invoice) As Integer Implements IComparer(Of Invoice).Compare

        Return x.HeaderInfo.DateCreated.CompareTo(y.HeaderInfo.DateCreated)

    End Function
End Class

usage:

Dim myList as new List(of Invoice)()

'add invoices to myList...

myList.Sort(new InvoiceSorter())

Don't you love Generics?


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