Custom data Type

Question

hey
i created a custom type and register it in healthvault, i followed the code in msdn of CustomHealthTypeWrapper. adding a new item to HV is working, but when i get that item from HV this error appeared:

Unable to cast object of type 'Microsoft.Health.ItemTypes.ApplicationSpecific' to type 'CustomHealthTypeWrapper'.

Here is the code i used to get an item:

Dim TYPE As Guid = New Guid(CustomHealthTypeWrapper.ApplicationCustomTypeID)
        Dim searcher As HealthRecordSearcher = Me.PersonInfo.SelectedRecord.CreateSearcher()
        Dim filter As HealthRecordFilter = New HealthRecordFilter()
        filter.TypeIds.Add(TYPE)
        filter.XPath = Incident.XPathFilterForQuery
        searcher.Filters.Add(filter)
        Dim objincident As New Incident

        Dim items As HealthRecordItemCollection = searcher.GetMatchingItems(0)
        For Each item As HealthRecordItem In items
            Dim obj As New CustomHealthTypeWrapper
            obj = DirectCast(item, CustomHealthTypeWrapper)
        Next

the error appeared when trying to cast from item to CustomHealthTypeWrapper

thanks

Answer 1

Did you call RegisterTypeHandler() on your class? If not, the SDK doesn't know how to create your class. Something like:

ItemTypeManager.RegisterTypeHandler(new Guid("a5033c9d-08cf-4204-9bd3-cb412ce39fc0"), typeof(CustomHealthTypeWrapper), true);

(translated to VB, of course...)

Answer 2

thanks
i did it and it works now