dataset1.vb

适合VB初学者看

        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableOrder_Details = CType(Me.Table,Order_DetailsDataTable)
        End Sub
        
        Public Property OrderID As Integer
            Get
                Return CType(Me(Me.tableOrder_Details.OrderIDColumn),Integer)
            End Get
            Set
                Me(Me.tableOrder_Details.OrderIDColumn) = value
            End Set
        End Property
        
        Public Property ProductID As Integer
            Get
                Return CType(Me(Me.tableOrder_Details.ProductIDColumn),Integer)
            End Get
            Set
                Me(Me.tableOrder_Details.ProductIDColumn) = value
            End Set
        End Property
        
        Public Property UnitPrice As Decimal
            Get
                Return CType(Me(Me.tableOrder_Details.UnitPriceColumn),Decimal)
            End Get
            Set
                Me(Me.tableOrder_Details.UnitPriceColumn) = value
            End Set
        End Property
        
        Public Property Quantity As Short
            Get
                Return CType(Me(Me.tableOrder_Details.QuantityColumn),Short)
            End Get
            Set
                Me(Me.tableOrder_Details.QuantityColumn) = value
            End Set
        End Property
        
        Public Property Discount As Single
            Get
                Return CType(Me(Me.tableOrder_Details.DiscountColumn),Single)
            End Get
            Set
                Me(Me.tableOrder_Details.DiscountColumn) = value
            End Set
        End Property
        
        Public Property ProductsRow As ProductsRow
            Get
                Return CType(Me.GetParentRow(Me.Table.ParentRelations("ProdOrder")),ProductsRow)
            End Get
            Set
                Me.SetParentRow(value, Me.Table.ParentRelations("ProdOrder"))
            End Set
        End Property
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class Order_DetailsRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As Order_DetailsRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As Order_DetailsRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As Order_DetailsRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class ProductsDataTable
        Inherits DataTable
        Implements System.Collections.IEnumerable
        
        Private columnProductID As DataColumn
        
        Private columnProductName As DataColumn
        
        Private columnCategoryID As DataColumn
        
        Private columnQuantityPerUnit As DataColumn
        
        Friend Sub New()
            MyBase.New("Products")
            Me.InitClass
        End Sub
        
        Friend Sub New(ByVal table As DataTable)
            MyBase.New(table.TableName)
            If (table.CaseSensitive <> table.DataSet.CaseSensitive) Then
                Me.CaseSensitive = table.CaseSensitive
            End If
            If (table.Locale.ToString <> table.DataSet.Locale.ToString) Then
                Me.Locale = table.Locale
            End If
            If (table.Namespace <> table.DataSet.Namespace) Then
                Me.Namespace = table.Namespace
            End If
            Me.Prefix = table.Prefix
            Me.MinimumCapacity = table.MinimumCapacity
            Me.DisplayExpression = table.DisplayExpression
        End Sub
        
        <System.ComponentModel.Browsable(false)>  _
        Public ReadOnly Property Count As Integer
            Get
                Return Me.Rows.Count
            End Get
        End Property
        
        Friend ReadOnly Property ProductIDColumn As DataColumn
            Get
                Return Me.columnProductID
            End Get
        End Property
        
        Friend ReadOnly Property ProductNameColumn As DataColumn
            Get
                Return Me.columnProductName
            End Get
        End Property
        
        Friend ReadOnly Property CategoryIDColumn As DataColumn
            Get
                Return Me.columnCategoryID
            End Get
        End Property
        
        Friend ReadOnly Property QuantityPerUnitColumn As DataColumn
            Get
                Return Me.columnQuantityPerUnit
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As ProductsRow
            Get
                Return CType(Me.Rows(index),ProductsRow)
            End Get
        End Property
        
        Public Event ProductsRowChanged As ProductsRowChangeEventHandler
        
        Public Event ProductsRowChanging As ProductsRowChangeEventHandler
        
        Public Event ProductsRowDeleted As ProductsRowChangeEventHandler
        
        Public Event ProductsRowDeleting As ProductsRowChangeEventHandler
        
        Public Overloads Sub AddProductsRow(ByVal row As ProductsRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddProductsRow(ByVal ProductName As String, ByVal CategoryID As Integer, ByVal QuantityPerUnit As String) As ProductsRow
            Dim rowProductsRow As ProductsRow = CType(Me.NewRow,ProductsRow)
            rowProductsRow.ItemArray = New Object() {Nothing, ProductName, CategoryID, QuantityPerUnit}
            Me.Rows.Add(rowProductsRow)
            Return rowProductsRow
        End Function
        
        Public Function FindByProductID(ByVal ProductID As Integer) As ProductsRow
            Return CType(Me.Rows.Find(New Object() {ProductID}),ProductsRow)
        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 ProductsDataTable = CType(MyBase.Clone,ProductsDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New ProductsDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnProductID = Me.Columns("ProductID")
            Me.columnProductName = Me.Columns("ProductName")
            Me.columnCategoryID = Me.Columns("CategoryID")
            Me.columnQuantityPerUnit = Me.Columns("QuantityPerUnit")
        End Sub
        
        Private Sub InitClass()
            Me.columnProductID = New DataColumn("ProductID", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnProductID)
            Me.columnProductName = New DataColumn("ProductName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnProductName)
            Me.columnCategoryID = New DataColumn("CategoryID", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCategoryID)
            Me.columnQuantityPerUnit = New DataColumn("QuantityPerUnit", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnQuantityPerUnit)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columnProductID}, true))
            Me.columnProductID.AutoIncrement = true
            Me.columnProductID.AllowDBNull = false
            Me.columnProductID.ReadOnly = true
            Me.columnProductID.Unique = true
            Me.columnProductName.AllowDBNull = false
        End Sub
        
        Public Function NewProductsRow() As ProductsRow
            Return CType(Me.NewRow,ProductsRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New ProductsRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(ProductsRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.ProductsRowChangedEvent) Is Nothing) Then
                RaiseEvent ProductsRowChanged(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.ProductsRowChangingEvent) Is Nothing) Then
                RaiseEvent ProductsRowChanging(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.ProductsRowDeletedEvent) Is Nothing) Then
                RaiseEvent ProductsRowDeleted(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.ProductsRowDeletingEvent) Is Nothing) Then
                RaiseEvent ProductsRowDeleting(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveProductsRow(ByVal row As ProductsRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class ProductsRow
        Inherits DataRow
        
        Private tableProducts As ProductsDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableProducts = CType(Me.Table,ProductsDataTable)
        End Sub
        
        Public Property ProductID As Integer
            Get
                Return CType(Me(Me.tableProducts.ProductIDColumn),Integer)
            End Get
            Set
                Me(Me.tableProducts.ProductIDColumn) = value
            End Set
        End Property
        
        Public Property ProductName As String
            Get
                Return CType(Me(Me.tableProducts.ProductNameColumn),String)
            End Get
            Set
                Me(Me.tableProducts.ProductNameColumn) = value
            End Set
        End Property
        
        Public Property CategoryID As Integer
            Get
                Try 
                    Return CType(Me(Me.tableProducts.CategoryIDColumn),Integer)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.CategoryIDColumn) = value
            End Set
        End Property
        
        Public Property QuantityPerUnit As String
            Get
                Try 
                    Return CType(Me(Me.tableProducts.QuantityPerUnitColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("无法获取值，因为它是 DBNull。", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.QuantityPerUnitColumn) = value
            End Set
        End Property
        
        Public Function IsCategoryIDNull() As Boolean
            Return Me.IsNull(Me.tableProducts.CategoryIDColumn)
        End Function
        
        Public Sub SetCategoryIDNull()
            Me(Me.tableProducts.CategoryIDColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsQuantityPerUnitNull() As Boolean
            Return Me.IsNull(Me.tableProducts.QuantityPerUnitColumn)
        End Function
        
        Public Sub SetQuantityPerUnitNull()
            Me(Me.tableProducts.QuantityPerUnitColumn) = System.Convert.DBNull
        End Sub
        
        Public Function GetOrder_DetailsRows() As Order_DetailsRow()
            Return CType(Me.GetChildRows(Me.Table.ChildRelations("ProdOrder")),Order_DetailsRow())
        End Function
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class ProductsRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As ProductsRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As ProductsRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As ProductsRow
            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