dataset1.vb

《ASP.NET C#程序设计案例教程》

            Return CType(Me.Rows.Find(New Object() {id}),usersRow)
        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 usersDataTable = CType(MyBase.Clone,usersDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New usersDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnemail = Me.Columns("email")
            Me.columnid = Me.Columns("id")
            Me.columnintro = Me.Columns("intro")
            Me.columnname = Me.Columns("name")
            Me.columnsubmit_date = Me.Columns("submit_date")
            Me.columntel = Me.Columns("tel")
        End Sub
        
        Private Sub InitClass()
            Me.columnemail = New DataColumn("email", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnemail)
            Me.columnid = New DataColumn("id", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnid)
            Me.columnintro = New DataColumn("intro", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnintro)
            Me.columnname = New DataColumn("name", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnname)
            Me.columnsubmit_date = New DataColumn("submit_date", GetType(System.DateTime), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnsubmit_date)
            Me.columntel = New DataColumn("tel", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columntel)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columnid}, true))
            Me.columnid.AutoIncrement = true
            Me.columnid.AllowDBNull = false
            Me.columnid.Unique = true
        End Sub
        
        Public Function NewusersRow() As usersRow
            Return CType(Me.NewRow,usersRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New usersRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(usersRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.usersRowChangedEvent) Is Nothing) Then
                RaiseEvent usersRowChanged(Me, New usersRowChangeEvent(CType(e.Row,usersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.usersRowChangingEvent) Is Nothing) Then
                RaiseEvent usersRowChanging(Me, New usersRowChangeEvent(CType(e.Row,usersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.usersRowDeletedEvent) Is Nothing) Then
                RaiseEvent usersRowDeleted(Me, New usersRowChangeEvent(CType(e.Row,usersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.usersRowDeletingEvent) Is Nothing) Then
                RaiseEvent usersRowDeleting(Me, New usersRowChangeEvent(CType(e.Row,usersRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveusersRow(ByVal row As usersRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class usersRow
        Inherits DataRow
        
        Private tableusers As usersDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableusers = CType(Me.Table,usersDataTable)
        End Sub
        
        Public Property email As String
            Get
                Try 
                    Return CType(Me(Me.tableusers.emailColumn),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.tableusers.emailColumn) = value
            End Set
        End Property
        
        Public Property id As Integer
            Get
                Return CType(Me(Me.tableusers.idColumn),Integer)
            End Get
            Set
                Me(Me.tableusers.idColumn) = value
            End Set
        End Property
        
        Public Property intro As String
            Get
                Try 
                    Return CType(Me(Me.tableusers.introColumn),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.tableusers.introColumn) = value
            End Set
        End Property
        
        Public Property name As String
            Get
                Try 
                    Return CType(Me(Me.tableusers.nameColumn),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.tableusers.nameColumn) = value
            End Set
        End Property
        
        Public Property submit_date As Date
            Get
                Try 
                    Return CType(Me(Me.tableusers.submit_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.tableusers.submit_dateColumn) = value
            End Set
        End Property
        
        Public Property tel As String
            Get
                Try 
                    Return CType(Me(Me.tableusers.telColumn),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.tableusers.telColumn) = value
            End Set
        End Property
        
        Public Function IsemailNull() As Boolean
            Return Me.IsNull(Me.tableusers.emailColumn)
        End Function
        
        Public Sub SetemailNull()
            Me(Me.tableusers.emailColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsintroNull() As Boolean
            Return Me.IsNull(Me.tableusers.introColumn)
        End Function
        
        Public Sub SetintroNull()
            Me(Me.tableusers.introColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsnameNull() As Boolean
            Return Me.IsNull(Me.tableusers.nameColumn)
        End Function
        
        Public Sub SetnameNull()
            Me(Me.tableusers.nameColumn) = System.Convert.DBNull
        End Sub
        
        Public Function Issubmit_dateNull() As Boolean
            Return Me.IsNull(Me.tableusers.submit_dateColumn)
        End Function
        
        Public Sub Setsubmit_dateNull()
            Me(Me.tableusers.submit_dateColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IstelNull() As Boolean
            Return Me.IsNull(Me.tableusers.telColumn)
        End Function
        
        Public Sub SettelNull()
            Me(Me.tableusers.telColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class usersRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As usersRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As usersRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As usersRow
            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