dspets.vb

Programming Web and Desktop Applications in ADO .NET and ASP .NET

            End Get
        End Property
        
        Public Event PetsRowChanged As PetsRowChangeEventHandler
        
        Public Event PetsRowChanging As PetsRowChangeEventHandler
        
        Public Event PetsRowDeleted As PetsRowChangeEventHandler
        
        Public Event PetsRowDeleting As PetsRowChangeEventHandler
        
        Public Overloads Sub AddPetsRow(ByVal row As PetsRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddPetsRow(ByVal Pet_Name As String, ByVal Friend_ID As Integer, ByVal Species As String, ByVal Age As Integer) As PetsRow
            Dim rowPetsRow As PetsRow = CType(Me.NewRow,PetsRow)
            rowPetsRow.ItemArray = New Object() {Pet_Name, Friend_ID, Species, Age}
            Me.Rows.Add(rowPetsRow)
            Return rowPetsRow
        End Function
        
        Public Function FindByPet_NameFriend_ID(ByVal Pet_Name As String, ByVal Friend_ID As Integer) As PetsRow
            Return CType(Me.Rows.Find(New Object() {Pet_Name, Friend_ID}),PetsRow)
        End Function
        
        Public Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
            Return Me.Rows.GetEnumerator
        End Function
        
        Public Overrides Function Clone() As DataTable
            Dim cln As PetsDataTable = CType(MyBase.Clone,PetsDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New PetsDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnPet_Name = Me.Columns("Pet Name")
            Me.columnFriend_ID = Me.Columns("Friend ID")
            Me.columnSpecies = Me.Columns("Species")
            Me.columnAge = Me.Columns("Age")
        End Sub
        
        Private Sub InitClass()
            Me.columnPet_Name = New DataColumn("Pet Name", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnPet_Name)
            Me.columnFriend_ID = New DataColumn("Friend ID", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFriend_ID)
            Me.columnSpecies = New DataColumn("Species", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnSpecies)
            Me.columnAge = New DataColumn("Age", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnAge)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columnPet_Name, Me.columnFriend_ID}, true))
            Me.columnPet_Name.AllowDBNull = false
            Me.columnFriend_ID.AllowDBNull = false
        End Sub
        
        Public Function NewPetsRow() As PetsRow
            Return CType(Me.NewRow,PetsRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New PetsRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(PetsRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.PetsRowChangedEvent) Is Nothing) Then
                RaiseEvent PetsRowChanged(Me, New PetsRowChangeEvent(CType(e.Row,PetsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.PetsRowChangingEvent) Is Nothing) Then
                RaiseEvent PetsRowChanging(Me, New PetsRowChangeEvent(CType(e.Row,PetsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.PetsRowDeletedEvent) Is Nothing) Then
                RaiseEvent PetsRowDeleted(Me, New PetsRowChangeEvent(CType(e.Row,PetsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.PetsRowDeletingEvent) Is Nothing) Then
                RaiseEvent PetsRowDeleting(Me, New PetsRowChangeEvent(CType(e.Row,PetsRow), e.Action))
            End If
        End Sub
        
        Public Sub RemovePetsRow(ByVal row As PetsRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class PetsRow
        Inherits DataRow
        
        Private tablePets As PetsDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tablePets = CType(Me.Table,PetsDataTable)
        End Sub
        
        Public Property Pet_Name As String
            Get
                Return CType(Me(Me.tablePets.Pet_NameColumn),String)
            End Get
            Set
                Me(Me.tablePets.Pet_NameColumn) = value
            End Set
        End Property
        
        Public Property Friend_ID As Integer
            Get
                Return CType(Me(Me.tablePets.Friend_IDColumn),Integer)
            End Get
            Set
                Me(Me.tablePets.Friend_IDColumn) = value
            End Set
        End Property
        
        Public Property Species As String
            Get
                Try 
                    Return CType(Me(Me.tablePets.SpeciesColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tablePets.SpeciesColumn) = value
            End Set
        End Property
        
        Public Property Age As Integer
            Get
                Try 
                    Return CType(Me(Me.tablePets.AgeColumn),Integer)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tablePets.AgeColumn) = value
            End Set
        End Property
        
        Public Function IsSpeciesNull() As Boolean
            Return Me.IsNull(Me.tablePets.SpeciesColumn)
        End Function
        
        Public Sub SetSpeciesNull()
            Me(Me.tablePets.SpeciesColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsAgeNull() As Boolean
            Return Me.IsNull(Me.tablePets.AgeColumn)
        End Function
        
        Public Sub SetAgeNull()
            Me(Me.tablePets.AgeColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class PetsRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As PetsRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As PetsRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As PetsRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
End Class