dsproducts.vb

Mastering VBNet Include Source Code

            Me.columnPicture = New DataColumn("Picture", GetType(System.Byte()), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnPicture)
            Me.PrimaryKey = New DataColumn() {Me.columnCategoryID}
        End Sub
        
        Public Function NewCategoriesRow() As CategoriesRow
            Return CType(Me.NewRow,CategoriesRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            'We need to ensure that all Rows in the tabled are typed rows.
            'Table calls newRow whenever it needs to create a row.
            'So the following conditions are covered by Row newRow(Record record)
            '* Cursor calls table.addRecord(record) 
            '* table.addRow(object[] values) calls newRow(record)    
            Return New CategoriesRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(CategoriesRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.CategoriesRowChangedEvent) Is Nothing) Then
                RaiseEvent CategoriesRowChanged(Me, New CategoriesRowChangeEvent(CType(e.Row,CategoriesRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.CategoriesRowChangingEvent) Is Nothing) Then
                RaiseEvent CategoriesRowChanging(Me, New CategoriesRowChangeEvent(CType(e.Row,CategoriesRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.CategoriesRowDeletedEvent) Is Nothing) Then
                RaiseEvent CategoriesRowDeleted(Me, New CategoriesRowChangeEvent(CType(e.Row,CategoriesRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.CategoriesRowDeletingEvent) Is Nothing) Then
                RaiseEvent CategoriesRowDeleting(Me, New CategoriesRowChangeEvent(CType(e.Row,CategoriesRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveCategoriesRow(ByVal row As CategoriesRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    Public Class CategoriesRow
        Inherits DataRow
        
        Private tableCategories As CategoriesDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableCategories = CType(Me.Table,CategoriesDataTable)
        End Sub
        
        Public Property CategoryID As Integer
            Get
                Return CType(Me(Me.tableCategories.CategoryIDColumn),Integer)
            End Get
            Set
                Me(Me.tableCategories.CategoryIDColumn) = value
            End Set
        End Property
        
        Public Property CategoryName As String
            Get
                Return CType(Me(Me.tableCategories.CategoryNameColumn),String)
            End Get
            Set
                Me(Me.tableCategories.CategoryNameColumn) = value
            End Set
        End Property
        
        Public Property Description As String
            Get
                Try 
                    Return CType(Me(Me.tableCategories.DescriptionColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCategories.DescriptionColumn) = value
            End Set
        End Property
        
        Public Property Picture As Byte()
            Get
                Try 
                    Return CType(Me(Me.tableCategories.PictureColumn),Byte())
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCategories.PictureColumn) = value
            End Set
        End Property
        
        Public Function IsDescriptionNull() As Boolean
            Return Me.IsNull(Me.tableCategories.DescriptionColumn)
        End Function
        
        Public Sub SetDescriptionNull()
            Me(Me.tableCategories.DescriptionColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsPictureNull() As Boolean
            Return Me.IsNull(Me.tableCategories.PictureColumn)
        End Function
        
        Public Sub SetPictureNull()
            Me(Me.tableCategories.PictureColumn) = System.Convert.DBNull
        End Sub
        
        Public Function GetProductsRows() As ProductsRow()
            Return CType(Me.GetChildRows(Me.Table.ChildRelations("CategoriesProducts")),ProductsRow())
        End Function
    End Class
    
    Public Class CategoriesRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As CategoriesRow
        
        Private eventAction As System.Data.DataRowAction
        
        Public Sub New(ByVal row As CategoriesRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As CategoriesRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
    
    Public Class SuppliersDataTable
        Inherits DataTable
        Implements System.Collections.IEnumerable
        
        Private columnSupplierID As DataColumn
        
        Private columnCompanyName As DataColumn
        
        Private columnContactName As DataColumn
        
        Private columnContactTitle As DataColumn
        
        Private columnAddress As DataColumn
        
        Private columnCity As DataColumn
        
        Private column_Region As DataColumn
        
        Private columnPostalCode As DataColumn
        
        Private columnCountry As DataColumn
        
        Private columnPhone As DataColumn
        
        Private columnFax As DataColumn
        
        Private columnHomePage As DataColumn
        
        Friend Sub New()
            MyBase.New("Suppliers")
            Me.InitClass
        End Sub
        
        <System.ComponentModel.Browsable(false)>  _
        Public ReadOnly Property Count As Integer
            Get
                Return Me.Rows.Count
            End Get
        End Property
        
        Friend ReadOnly Property SupplierIDColumn As DataColumn
            Get
                Return Me.columnSupplierID
            End Get
        End Property
        
        Friend ReadOnly Property CompanyNameColumn As DataColumn
            Get
                Return Me.columnCompanyName
            End Get
        End Property
        
        Friend ReadOnly Property ContactNameColumn As DataColumn
            Get
                Return Me.columnContactName
            End Get
        End Property
        
        Friend ReadOnly Property ContactTitleColumn As DataColumn
            Get
                Return Me.columnContactTitle
            End Get
        End Property
        
        Friend ReadOnly Property AddressColumn As DataColumn
            Get
                Return Me.columnAddress
            End Get
        End Property
        
        Friend ReadOnly Property CityColumn As DataColumn
            Get
                Return Me.columnCity
            End Get
        End Property
        
        Friend ReadOnly Property _RegionColumn As DataColumn
            Get
                Return Me.column_Region
            End Get
        End Property
        
        Friend ReadOnly Property PostalCodeColumn As DataColumn
            Get
                Return Me.columnPostalCode
            End Get
        End Property
        
        Friend ReadOnly Property CountryColumn As DataColumn
            Get
                Return Me.columnCountry
            End Get
        End Property
        
        Friend ReadOnly Property PhoneColumn As DataColumn
            Get
                Return Me.columnPhone
            End Get
        End Property
        
        Friend ReadOnly Property FaxColumn As DataColumn
            Get
                Return Me.columnFax
            End Get
        End Property
        
        Friend ReadOnly Property HomePageColumn As DataColumn
            Get
                Return Me.columnHomePage
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As SuppliersRow
            Get
                Return CType(Me.Rows(index),SuppliersRow)
            End Get
        End Property
        
        Public Event SuppliersRowChanged As SuppliersRowChangeEventHandler
        
        Public Event SuppliersRowChanging As SuppliersRowChangeEventHandler
        
        Public Event SuppliersRowDeleted As SuppliersRowChangeEventHandler
        
        Public Event SuppliersRowDeleting As SuppliersRowChangeEventHandler
        
        Public Overloads Sub AddSuppliersRow(ByVal row As SuppliersRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddSuppliersRow(ByVal CompanyName As String, ByVal ContactName As String, ByVal ContactTitle As String, ByVal Address As String, ByVal City As String, ByVal _Region As String, ByVal PostalCode As String, ByVal Country As String, ByVal Phone As String, ByVal Fax As String, ByVal HomePage As String) As SuppliersRow
            Dim rowSuppliersRow As SuppliersRow = CType(Me.NewRow,SuppliersRow)
            rowSuppliersRow.ItemArray = New Object() {Nothing, CompanyName, ContactName, ContactTitle, Address, City, _Region, PostalCode, Country, Phone, Fax, HomePage}
            Me.Rows.Add(rowSuppliersRow)
            Return rowSuppliersRow
        End Function
        
        Public Function FindBySupplierID(ByVal SupplierID As Integer) As SuppliersRow
            Return CType(Me.Rows.Find(New Object() {SupplierID}),SuppliersRow)
        End Function
        
        Public Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
            Return Me.Rows.GetEnumerator
        End Function
        
        Private Sub InitClass()
            Me.columnSupplierID = New DataColumn("SupplierID", GetType(System.Int32), "", System.Data.MappingType.Element)
            Me.columnSupplierID.AutoIncrement = true
            Me.columnSupplierID.AllowDBNull = false
            Me.columnSupplierID.ReadOnly = true
            Me.columnSupplierID.Unique = true
            Me.Columns.Add(Me.columnSupplierID)
            Me.columnCompanyName = New DataColumn("CompanyName", GetType(System.String), "", System.Data.MappingType.Element)
            Me.columnCompanyName.AllowDBNull = false
            Me.Columns.Add(Me.columnCompanyName)
            Me.columnContactName = New DataColumn("ContactName", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnContactName)
            Me.columnContactTitle = New DataColumn("ContactTitle", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnContactTitle)
            Me.columnAddress = New DataColumn("Address", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnAddress)
            Me.columnCity = New DataColumn("City", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCity)
            Me.column_Region = New DataColumn("Region", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.column_Region)
            Me.columnPostalCode = New DataColumn("PostalCode", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnPostalCode)
            Me.columnCountry = New DataColumn("Country", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCountry)
            Me.columnPhone = New DataColumn("Phone", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnPhone)