Question

I currently have a itemsCollection and a historyCollection. Both are separate isolated .dat files.

The saving and displaying works fine for both of these isolated storages, however the problem is when I try to delete something out of the itemCollection I also want to remove all the items out of the historyItemCollection where the historyItemCollection contains that specific itemIndex.

Update:

The itemCollection could contain something like this:

• a
• b
• c

The historyItemCollection could look like this:

• a
• b
• c
• b

So if I remove b (itemIndex 1) then I want both to be removed in the historyItemCollection.

I can remove the items out of the itemCollection fine, but the historyItemCollection throws errors.

        int i = 0;
        for (i = 0; i <= App.ViewModel.historyItemCollection.Count-1; i++)
        {
            if (App.ViewModel.historyItemCollection[i].VehicleId == (Application.Current as App).vehicleIndex)
            {
                App.ViewModel.historyItemCollection[i].Remove(i);
            }
        }

        App.ViewModel.vehicleItemsCollection[(Application.Current as App).vehicleIndex].Remove((Application.Current as App).vehicleIndex);

The error message I’m getting:
Parameter name: index

It fails on this line:

App.ViewModel.historyItemCollection[i].Remove(i);

Answer 1

In this line do you really mean both of these to be itemIndex?

App.ViewModel.historyItemCollection[(Application.Current as App).itemIndex].Remove((Application.Current as App).itemIndex);

Also, does calling RefreshItems() have any impact on itemIndex?

I’d recommend breaking your code up into more lines – then single stepping through.

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As an aside, why are you setting the DataContext in this method? Then why are you also setting it twice – and to different types of objects each time. This seems unusual – perhaps you could instead set the DataContext globally to a new ViewModel class which has the history and items as children?