dscpgx.vb

一个实际的商业项目

            Dim rowCpgxRow As CpgxRow = CType(Me.NewRow,CpgxRow)
            rowCpgxRow.ItemArray = New Object() {Pf, Gx, Jg, Fei1, Fei2, Fei3}
            Me.Rows.Add(rowCpgxRow)
            Return rowCpgxRow
        End Function
        
        Public Function FindByPfGx(ByVal Pf As String, ByVal Gx As String) As CpgxRow
            Return CType(Me.Rows.Find(New Object() {Pf, Gx}),CpgxRow)
        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 CpgxDataTable = CType(MyBase.Clone,CpgxDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New CpgxDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnPf = Me.Columns("Pf")
            Me.columnGx = Me.Columns("Gx")
            Me.columnJg = Me.Columns("Jg")
            Me.columnFei1 = Me.Columns("Fei1")
            Me.columnFei2 = Me.Columns("Fei2")
            Me.columnFei3 = Me.Columns("Fei3")
        End Sub
        
        Private Sub InitClass()
            Me.columnPf = New DataColumn("Pf", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnPf)
            Me.columnGx = New DataColumn("Gx", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnGx)
            Me.columnJg = New DataColumn("Jg", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnJg)
            Me.columnFei1 = New DataColumn("Fei1", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFei1)
            Me.columnFei2 = New DataColumn("Fei2", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFei2)
            Me.columnFei3 = New DataColumn("Fei3", GetType(System.Decimal), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFei3)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columnPf, Me.columnGx}, true))
            Me.columnPf.AllowDBNull = false
            Me.columnGx.AllowDBNull = false
        End Sub
        
        Public Function NewCpgxRow() As CpgxRow
            Return CType(Me.NewRow,CpgxRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New CpgxRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(CpgxRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.CpgxRowChangedEvent) Is Nothing) Then
                RaiseEvent CpgxRowChanged(Me, New CpgxRowChangeEvent(CType(e.Row,CpgxRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.CpgxRowChangingEvent) Is Nothing) Then
                RaiseEvent CpgxRowChanging(Me, New CpgxRowChangeEvent(CType(e.Row,CpgxRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.CpgxRowDeletedEvent) Is Nothing) Then
                RaiseEvent CpgxRowDeleted(Me, New CpgxRowChangeEvent(CType(e.Row,CpgxRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.CpgxRowDeletingEvent) Is Nothing) Then
                RaiseEvent CpgxRowDeleting(Me, New CpgxRowChangeEvent(CType(e.Row,CpgxRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveCpgxRow(ByVal row As CpgxRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CpgxRow
        Inherits DataRow
        
        Private tableCpgx As CpgxDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableCpgx = CType(Me.Table,CpgxDataTable)
        End Sub
        
        Public Property Pf As String
            Get
                Return CType(Me(Me.tableCpgx.PfColumn),String)
            End Get
            Set
                Me(Me.tableCpgx.PfColumn) = value
            End Set
        End Property
        
        Public Property Gx As String
            Get
                Return CType(Me(Me.tableCpgx.GxColumn),String)
            End Get
            Set
                Me(Me.tableCpgx.GxColumn) = value
            End Set
        End Property
        
        Public Property Jg As Decimal
            Get
                Try 
                    Return CType(Me(Me.tableCpgx.JgColumn),Decimal)
                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.tableCpgx.JgColumn) = value
            End Set
        End Property
        
        Public Property Fei1 As Decimal
            Get
                Try 
                    Return CType(Me(Me.tableCpgx.Fei1Column),Decimal)
                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.tableCpgx.Fei1Column) = value
            End Set
        End Property
        
        Public Property Fei2 As Decimal
            Get
                Try 
                    Return CType(Me(Me.tableCpgx.Fei2Column),Decimal)
                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.tableCpgx.Fei2Column) = value
            End Set
        End Property
        
        Public Property Fei3 As Decimal
            Get
                Try 
                    Return CType(Me(Me.tableCpgx.Fei3Column),Decimal)
                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.tableCpgx.Fei3Column) = value
            End Set
        End Property
        
        Public Function IsJgNull() As Boolean
            Return Me.IsNull(Me.tableCpgx.JgColumn)
        End Function
        
        Public Sub SetJgNull()
            Me(Me.tableCpgx.JgColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsFei1Null() As Boolean
            Return Me.IsNull(Me.tableCpgx.Fei1Column)
        End Function
        
        Public Sub SetFei1Null()
            Me(Me.tableCpgx.Fei1Column) = System.Convert.DBNull
        End Sub
        
        Public Function IsFei2Null() As Boolean
            Return Me.IsNull(Me.tableCpgx.Fei2Column)
        End Function
        
        Public Sub SetFei2Null()
            Me(Me.tableCpgx.Fei2Column) = System.Convert.DBNull
        End Sub
        
        Public Function IsFei3Null() As Boolean
            Return Me.IsNull(Me.tableCpgx.Fei3Column)
        End Function
        
        Public Sub SetFei3Null()
            Me(Me.tableCpgx.Fei3Column) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CpgxRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As CpgxRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As CpgxRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As CpgxRow
            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