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QuestionPage/Frame Pin
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QuestionStuck with Weird Exceptions Pin
Kevin Marois7-Sep-21 13:51
professionalKevin Marois7-Sep-21 13:51 
I have a Purchase Order Creation window that has dialogs to allow the user to add items to the PO. The main view model is AddEditPurchaseOrderViewModel. There are different types of items such as Equipment, Lumber, Hardware, etc, that can be added and each has its own View and VM.

In each window the user must select the item they want (Equipment, Hardware, etc) and any number of Sequence Sheets. For each Sequence Sheet selected a new line item created an added to the Purchase Order. So, if the user selects Lumber for 3 Sequence Sheets, then 3 Lumber line items are added to the PO. To create the line items I am cloning the initial line item, changing a few properties on it, and adding it to the PO.

Here's a pic of what I'm working on.

All of a sudden now, my Clone class is throwing bizzare errors. It's telling me that the dialog's viewmodel is not serializable. It doesn't need to be - the entity I get from the VM's is what's being cloned.

Here's my AddPOItem Method
private void AddPOItemExecuted()
{
    _PurchaseOrderDialogBase vm = null;

    // Create a new default PO item
    var poItem = new PurchaseOrderItemEntity
    {
        PurchaseOrderHeaderId = PurchaseOrderHeader.Id,
        JobId = PurchaseOrderHeader.JobId,
        PurchaseOrderKind = PurchaseOrderHeader.PurchaseOrderKind
    };

    // Argument class
    var args = new AddEditPOItemArgsModel
    {
        LocationId = SelectedLocation.Id,
        POItem = poItem,
        SequenceSheets = _sequenceSheets,
        POType = PurchaseOrderHeader.PurchaseOrderType
    };

    switch (PurchaseOrderHeader.PurchaseOrderType)
    {
        // Add Equipment to the PO
        case Entities.Enums.PurchaseOrderType.Equipment:
            if (SelectedVendor.Id == AppCore.DNACompany.Id ||
                SelectedVendor.Id == AppCore.ParagonCompany.Id)
            {
                vm = new AddEditEquipmentFromInventoryViewModel(args, "Add Equipment Item");
            }
            else
            {
                vm = new AddEditPOItemViewModel(args, "Add Equipment Item", SelectedVendor.Id);
            }
            break;

        // Add Lumber to the PO
        case Entities.Enums.PurchaseOrderType.Lumber:
            if (SelectedVendor.Id == AppCore.DNACompany.Id ||
                SelectedVendor.Id == AppCore.ParagonCompany.Id)
            {
                vm = new AddEditLumberFromInventoryViewModel(args, "Add Lumber Item");
            }
            else
            {
                vm = new AddEditLumberPOItemViewModel(args, "Add Lumber Item");
            }
            break;

        // OTHER CASE STATEMENTS OMMITED
    }

    if (vm != null)
    {
        DialogResultEx dialogResult = DialogService.ShowDialog(vm, typeof(MainWindowView));

        if ((bool)dialogResult.DialogResult)
        {
            // For Equipment and Tools, only add one line item
            if (PurchaseOrderHeader.PurchaseOrderType == Entities.Enums.PurchaseOrderType.Equipment ||
                PurchaseOrderHeader.PurchaseOrderType == Entities.Enums.PurchaseOrderType.Tools)
            {
                poItem.EntityState = EntityState.New;
                PurchaseOrderHeader.PurchaseOrderItems.Add(poItem);
            }
            else
            {
                // For all other types, add one line item for each selected Lot
                var selectedSheets = vm.SequenceSheetInfos.Where(x => x.IsSelected).ToList();
                foreach (var selectedSheet in selectedSheets)
                {
                    // Clone the line item
                    var newItem = poItem.Clone();    //<============= THROWS HERE

                    // Adjust properties
                    newItem.JobSequenceSheetId = selectedSheet.JobSequenceSheetId;
                    newItem.EntityState = EntityState.New;
                    newItem.PlanElevation = selectedSheet.JobLotInfo;

                    // Add the Line Item to the PO
                    PurchaseOrderHeader.PurchaseOrderItems.Add(newItem);
                }
            }
        }
    }
}
and my Clone method
public static T Clone<T>(this T source)
{
    if (!typeof(T).IsSerializable)
    {
        throw new ArgumentException("The type must be serializable.", nameof(source));
    }

    if (ReferenceEquals(source, null))
    {
        return default;
    }

    using (Stream stream = new MemoryStream())
    {
        IFormatter formatter = new BinaryFormatter();
        formatter.Serialize(stream, source);
        stream.Seek(0, SeekOrigin.Begin);
        return (T)formatter.Deserialize(stream);
    }
}

And here's a pic of the error. Not that the type passed in is PurchaseOrderItemEntity, which IS serializable, yet the exception tells me the AddEditPOItemViewModel is not serializable. Th is doesn't make any sense. I get this regardless of which dialog I opened and the message shows that VM's name.

Anyone have any idea what's going on?
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

AnswerRe: Stuck with Weird Exceptions Pin
Richard Deeming7-Sep-21 21:28
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GeneralRe: Stuck with Weird Exceptions Pin
Kevin Marois8-Sep-21 4:58
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QuestionDisable ComboBox Hyperlinks Pin
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QuestionWPF DataGrid - Stretch Row Details Vertically Pin
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QuestionGet MainWindow from Executing Assembly Pin
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AnswerRe: Get MainWindow from Executing Assembly Pin
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GeneralCan anyone recommend a free WPF editor control? Pin
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GeneralRe: Can anyone recommend a free WPF editor control? Pin
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