dataset1.vb

这是一个仓库管理系统

        Public Event mytableRowDeleting As mytableRowChangeEventHandler
        
        Public Overloads Sub AddmytableRow(ByVal row As mytableRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddmytableRow(ByVal _date As Date, ByVal income As Single, ByVal outgoing As Single, ByVal sum As Single) As mytableRow
            Dim rowmytableRow As mytableRow = CType(Me.NewRow,mytableRow)
            rowmytableRow.ItemArray = New Object() {_date, income, outgoing, sum}
            Me.Rows.Add(rowmytableRow)
            Return rowmytableRow
        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 mytableDataTable = CType(MyBase.Clone,mytableDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New mytableDataTable
        End Function
        
        Friend Sub InitVars()
            Me.column_date = Me.Columns("date")
            Me.columnincome = Me.Columns("income")
            Me.columnoutgoing = Me.Columns("outgoing")
            Me.columnsum = Me.Columns("sum")
        End Sub
        
        Private Sub InitClass()
            Me.column_date = New DataColumn("date", GetType(System.DateTime), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column_date)
            Me.columnincome = New DataColumn("income", GetType(System.Single), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnincome)
            Me.columnoutgoing = New DataColumn("outgoing", GetType(System.Single), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnoutgoing)
            Me.columnsum = New DataColumn("sum", GetType(System.Single), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnsum)
        End Sub
        
        Public Function NewmytableRow() As mytableRow
            Return CType(Me.NewRow,mytableRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New mytableRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(mytableRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.mytableRowChangedEvent) Is Nothing) Then
                RaiseEvent mytableRowChanged(Me, New mytableRowChangeEvent(CType(e.Row,mytableRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.mytableRowChangingEvent) Is Nothing) Then
                RaiseEvent mytableRowChanging(Me, New mytableRowChangeEvent(CType(e.Row,mytableRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.mytableRowDeletedEvent) Is Nothing) Then
                RaiseEvent mytableRowDeleted(Me, New mytableRowChangeEvent(CType(e.Row,mytableRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.mytableRowDeletingEvent) Is Nothing) Then
                RaiseEvent mytableRowDeleting(Me, New mytableRowChangeEvent(CType(e.Row,mytableRow), e.Action))
            End If
        End Sub
        
        Public Sub RemovemytableRow(ByVal row As mytableRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class mytableRow
        Inherits DataRow
        
        Private tablemytable As mytableDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tablemytable = CType(Me.Table,mytableDataTable)
        End Sub
        
        Public Property _date As Date
            Get
                Try 
                    Return CType(Me(Me.tablemytable._dateColumn),Date)
                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.tablemytable._dateColumn) = value
            End Set
        End Property
        
        Public Property income As Single
            Get
                Try 
                    Return CType(Me(Me.tablemytable.incomeColumn),Single)
                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.tablemytable.incomeColumn) = value
            End Set
        End Property
        
        Public Property outgoing As Single
            Get
                Try 
                    Return CType(Me(Me.tablemytable.outgoingColumn),Single)
                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.tablemytable.outgoingColumn) = value
            End Set
        End Property
        
        Public Property sum As Single
            Get
                Try 
                    Return CType(Me(Me.tablemytable.sumColumn),Single)
                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.tablemytable.sumColumn) = value
            End Set
        End Property
        
        Public Function Is_dateNull() As Boolean
            Return Me.IsNull(Me.tablemytable._dateColumn)
        End Function
        
        Public Sub Set_dateNull()
            Me(Me.tablemytable._dateColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsincomeNull() As Boolean
            Return Me.IsNull(Me.tablemytable.incomeColumn)
        End Function
        
        Public Sub SetincomeNull()
            Me(Me.tablemytable.incomeColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsoutgoingNull() As Boolean
            Return Me.IsNull(Me.tablemytable.outgoingColumn)
        End Function
        
        Public Sub SetoutgoingNull()
            Me(Me.tablemytable.outgoingColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IssumNull() As Boolean
            Return Me.IsNull(Me.tablemytable.sumColumn)
        End Function
        
        Public Sub SetsumNull()
            Me(Me.tablemytable.sumColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class mytableRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As mytableRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As mytableRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As mytableRow
            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