mydataset.vb

Visual Basic.net 实例入门

            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function Add学生成绩表Row(ByVal 姓名 As String, ByVal 语文 As Integer, ByVal 数学 As Integer, ByVal 英语 As Integer) As 学生成绩表Row
            Dim row学生成绩表Row As 学生成绩表Row = CType(Me.NewRow,学生成绩表Row)
            row学生成绩表Row.ItemArray = New Object() {Nothing, 姓名, 语文, 数学, 英语}
            Me.Rows.Add(row学生成绩表Row)
            Return row学生成绩表Row
        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 学生成绩表DataTable = CType(MyBase.Clone,学生成绩表DataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New 学生成绩表DataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnID号 = Me.Columns("ID号")
            Me.column姓名 = Me.Columns("姓名")
            Me.column语文 = Me.Columns("语文")
            Me.column数学 = Me.Columns("数学")
            Me.column英语 = Me.Columns("英语")
        End Sub
        
        Private Sub InitClass()
            Me.columnID号 = New DataColumn("ID号", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnID号)
            Me.column姓名 = New DataColumn("姓名", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column姓名)
            Me.column语文 = New DataColumn("语文", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column语文)
            Me.column数学 = New DataColumn("数学", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column数学)
            Me.column英语 = New DataColumn("英语", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.column英语)
            Me.columnID号.AutoIncrement = true
            Me.columnID号.AllowDBNull = false
            Me.columnID号.ReadOnly = true
        End Sub
        
        Public Function New学生成绩表Row() As 学生成绩表Row
            Return CType(Me.NewRow,学生成绩表Row)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New 学生成绩表Row(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(学生成绩表Row)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.学生成绩表RowChangedEvent) Is Nothing) Then
                RaiseEvent 学生成绩表RowChanged(Me, New 学生成绩表RowChangeEvent(CType(e.Row,学生成绩表Row), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.学生成绩表RowChangingEvent) Is Nothing) Then
                RaiseEvent 学生成绩表RowChanging(Me, New 学生成绩表RowChangeEvent(CType(e.Row,学生成绩表Row), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.学生成绩表RowDeletedEvent) Is Nothing) Then
                RaiseEvent 学生成绩表RowDeleted(Me, New 学生成绩表RowChangeEvent(CType(e.Row,学生成绩表Row), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.学生成绩表RowDeletingEvent) Is Nothing) Then
                RaiseEvent 学生成绩表RowDeleting(Me, New 学生成绩表RowChangeEvent(CType(e.Row,学生成绩表Row), e.Action))
            End If
        End Sub
        
        Public Sub Remove学生成绩表Row(ByVal row As 学生成绩表Row)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class 学生成绩表Row
        Inherits DataRow
        
        Private table学生成绩表 As 学生成绩表DataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.table学生成绩表 = CType(Me.Table,学生成绩表DataTable)
        End Sub
        
        Public Property ID号 As Integer
            Get
                Return CType(Me(Me.table学生成绩表.ID号Column),Integer)
            End Get
            Set
                Me(Me.table学生成绩表.ID号Column) = value
            End Set
        End Property
        
        Public Property 姓名 As String
            Get
                Try 
                    Return CType(Me(Me.table学生成绩表.姓名Column),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.table学生成绩表.姓名Column) = value
            End Set
        End Property
        
        Public Property 语文 As Integer
            Get
                Try 
                    Return CType(Me(Me.table学生成绩表.语文Column),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.table学生成绩表.语文Column) = value
            End Set
        End Property
        
        Public Property 数学 As Integer
            Get
                Try 
                    Return CType(Me(Me.table学生成绩表.数学Column),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.table学生成绩表.数学Column) = value
            End Set
        End Property
        
        Public Property 英语 As Integer
            Get
                Try 
                    Return CType(Me(Me.table学生成绩表.英语Column),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.table学生成绩表.英语Column) = value
            End Set
        End Property
        
        Public Function Is姓名Null() As Boolean
            Return Me.IsNull(Me.table学生成绩表.姓名Column)
        End Function
        
        Public Sub Set姓名Null()
            Me(Me.table学生成绩表.姓名Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is语文Null() As Boolean
            Return Me.IsNull(Me.table学生成绩表.语文Column)
        End Function
        
        Public Sub Set语文Null()
            Me(Me.table学生成绩表.语文Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is数学Null() As Boolean
            Return Me.IsNull(Me.table学生成绩表.数学Column)
        End Function
        
        Public Sub Set数学Null()
            Me(Me.table学生成绩表.数学Column) = System.Convert.DBNull
        End Sub
        
        Public Function Is英语Null() As Boolean
            Return Me.IsNull(Me.table学生成绩表.英语Column)
        End Function
        
        Public Sub Set英语Null()
            Me(Me.table学生成绩表.英语Column) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class 学生成绩表RowChangeEvent
        Inherits EventArgs
        
        Private eventRow As 学生成绩表Row
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As 学生成绩表Row, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As 学生成绩表Row
            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