Hello:

I am trying to sort a collection using the sorting functionality offered by
the ArrayList but seem to be getting inconsistent results.

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the InvoiceLineItemCollection sort code looks like this -

internal void Sort()

{

// Sort collection items using ArrayList.

     // Collection items must implement IComparable.

     ArrayList arrayList = new ArrayList();

     foreach(InvoiceLineItem invoiceLineItem in this)

     {

           arrayList.Add(invoiceLineItem.Clone());

     }

     arrayList.Sort();

     // Repopulate collection with sorted items.

     this.Clear();

     foreach(Object obj in arrayList)

     {

           this.Add((InvoiceLineItem)obj);

     }

}

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The InvoiceLineItem implementation of CompareTo looks like this -

(Note: both PlanID and PlanBeneficairyID are of type GUID).

public int CompareTo(Object obj)

{

if(!(obj is InvoiceLineItem)) throw new InvalidCastException("Not an
InvoiceLineItem object.");

Int32 sortResult;

     InvoiceLineItem invoiceLineItem = (InvoiceLineItem)obj;

     // * Perform line Item sort. *

     //   Notes:

     //   1. If items are equal (result = 0), comparison is based upon

     //      next search criteria property.

     //   2. Sort criteria for line Items are:

     //                a.  PlanID

     //                b.  PlanBeneficiaryAssignmentID

     // Compare plans(sort criteria 1).

     sortResult = this.PlanID.CompareTo(invoiceLineItem.PlanID);

     if(sortResult == 0)

     {

           // Compare plan beneficiary assignments (sort criteria 2).

sortResult =
this.PlanBeneficiaryAssignmentID.CompareTo(invoiceLineItem.PlanBeneficiaryAssignmentID);

     }

     return sortResult;

}

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Any idea why the order of the items in the InvoiceLineItemCollection is not
consistent when sorting the same group of items?

Thanks!

Chris