[RESOLVED] confused now ...

:confused:

Hi, this code below adds records to the collection as commented by the developer (not me), but how come not all fields are saved in the array but then those fields which are not saved can be retrieved??? :confused:

Please help, see comments with " This is adding to collection base ..."

Code:

---

Public Class NewMsgText

    Public Txt As String
    Public HtmTxt As String

End Class


Public Class RecordDefinition

    Public WarnCode As String = ""
    Public WarnDesc As String = ""
    Public WarnType As String = ""
    Public NewHdr As New NewMsgText()
    Public NewFtr As New NewMsgText()
   
End Class


<Serializable()> _
Public Class WarningAdvisor
    Inherits CollectionBase
   
    Public Sub New()
    End Sub
   
    Public Sub Add(ByVal _newItem As RecordDefinition)
        list.Add(_newItem)
    End Sub

    Public Function Add(ByVal xCode As String, ByVal xDescr As String, ByVal xType As String) As RecordDefinition

        Dim _thisItem As New RecordDefinition()
        With _thisItem
            .WarnCode = xCode
            .WarnDesc = xDescr
            .WarnType = xType
        End With
        Add(_thisItem)
        Return _thisItem

    End Function
   
    <XmlElement(ElementName:="Items")> _
    Default Public Overridable ReadOnly Property Item(ByVal index As Integer) As RecordDefinition
        Get
            Return CType(Me.List(index), RecordDefinition)
        End Get
    End Property

End Class

Public Class Project Class

Public oWarning As New WarningAdvisor() 

        Dim dsCode As String
        Dim dsDescr As String
        Dim dsHeadText As String
        Dim dsHeadHTML As String
        Dim dsFootText As String
        Dim dsFootHTML As String
        Dim dsType As String

Dim oReader As SqlDataReader
Dim myRecords As RecordDefinition()

oReader = oCommand.ExecuteReader()


          ‘oReader HAVE 10 ROWS WITH 7 COLUMNS here
            While oReader.Read()
                dsCode = "" & oReader("Code")
                dsDescr = "" & oReader("Descrip")
                dsType = "" & oReader("Type")
                dsHeadText = "" & oReader("TextHead")
                dsHeadHTML = "" & oReader("HTMLHead")
                dsFootText = "" & oReader("TextFoot")
                dsFootHTML = "" & oReader("HTMLfoot")
             
               
                ‘THIS IS ADDING TO COLLECTION BASE, BUT WHY ONLY 3 FIELDS???

                myRecords = oWarning.Add(dsCode, dsDescr, dsType)

                With myRecords.NewHdr
                    .Txt = dsHeadText
                    .HtmTxt = dsHeadHTML
                End With
                With myRecords.NewFtr
                    .Txt = dsFootText
                    .HtmTxt = dsFootHTML
                End With
             
            End While
End Class

---

does "myRecords" object holds the reference/pointer value to the 10 rows with 7 columns? (like a multidimensional array???)

When you create a RecordDefinition object those last two fields are implicitly created as well.

Code:

---

Public Class RecordDefinition

    Public WarnCode As String = ""
    Public WarnDesc As String = ""
    Public WarnType As String = ""
    Public NewHdr As New NewMsgText()
    Public NewFtr As New NewMsgText()
   
End Class

---

A New RecordDefinition automatically contains those two New NewMsgText objects.

yes, but in the collections list, how come the "add" method only adds 3 fields and not all of them, and yet when the program accesses the object "myRecords" it can display those extra 4 fields as well?

Quote:

---

Originally Posted by layne

:confused:


‘oReader HAVE 10 ROWS WITH 7 COLUMNS here
While oReader.Read()
dsCode = "" & oReader("Code")
dsDescr = "" & oReader("Descrip")
dsType = "" & oReader("Type")
dsHeadText = "" & oReader("TextHead")
dsHeadHTML = "" & oReader("HTMLHead")
dsFootText = "" & oReader("TextFoot")
dsFootHTML = "" & oReader("HTMLfoot")


‘THIS IS ADDING TO COLLECTION BASE, BUT WHY ONLY 3 FIELDS???

myRecords = oWarning.Add(dsCode, dsDescr, dsType)

With myRecords.NewHdr
.Txt = dsHeadText
.HtmTxt = dsHeadHTML
End With
With myRecords.NewFtr
.Txt = dsFootText
.HtmTxt = dsFootHTML
End With

End While
End Class[/CODE]

---

the program adds to collection, but the remaining 4 fields are being overwritten by the "with - end with" blocks, so how come the object "myRecords" seem to have the rows???

thanks

oWarning.Add() initializes myRecords and sets the value of the first three variables.

After that, the "with - end with" blocks are setting values to myRecords.NewHdr.Txt etc. by direct assignment.

So now you have a RecordDefinition instance called myRecords with 7 variables that have been assigned some values. What's the question? What do you mean by "rows"?

Edit: To be more specific, myRecords is being created in the above way then added to the instance of WarningAdvisor called oWarning each step of the while loop. If oReader has 10 "rows" and one row is passed every time its Read() function is called, then you have an object of type WarningAdvisor called oWarning that contains 10 objects of type RecordDefinition, each of which has 7 variables that now have values which were contained in the "collumns" of oReader.

Hope that made sense.

geez, thanks for that Daarklord, I never noticed the:

Public Function Add(ByVal xCode As String, ByVal xDescr As String, ByVal xType As String) As RecordDefinition

Dim _thisItem As New RecordDefinition()

that it creates a NEW object then add to collection. I hope I can figure the rest. :)