dsmaster.vb

东软内部材料（六）ado .net相关

        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.CustomerListRowDeletedEvent) Is Nothing) Then
                RaiseEvent CustomerListRowDeleted(Me, New CustomerListRowChangeEvent(CType(e.Row,CustomerListRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.CustomerListRowDeletingEvent) Is Nothing) Then
                RaiseEvent CustomerListRowDeleting(Me, New CustomerListRowChangeEvent(CType(e.Row,CustomerListRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveCustomerListRow(ByVal row As CustomerListRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CustomerListRow
        Inherits DataRow
        
        Private tableCustomerList As CustomerListDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableCustomerList = CType(Me.Table,CustomerListDataTable)
        End Sub
        
        Public Property CustomerID As String
            Get
                Return CType(Me(Me.tableCustomerList.CustomerIDColumn),String)
            End Get
            Set
                Me(Me.tableCustomerList.CustomerIDColumn) = value
            End Set
        End Property
        
        Public Property CompanyName As String
            Get
                Return CType(Me(Me.tableCustomerList.CompanyNameColumn),String)
            End Get
            Set
                Me(Me.tableCustomerList.CompanyNameColumn) = value
            End Set
        End Property
        
        Public Property City As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomerList.CityColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCustomerList.CityColumn) = value
            End Set
        End Property
        
        Public Property Country As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomerList.CountryColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCustomerList.CountryColumn) = value
            End Set
        End Property
        
        Public Property PostalCode As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomerList.PostalCodeColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCustomerList.PostalCodeColumn) = value
            End Set
        End Property
        
        Public Property _Region As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomerList._RegionColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableCustomerList._RegionColumn) = value
            End Set
        End Property
        
        Public Function IsCityNull() As Boolean
            Return Me.IsNull(Me.tableCustomerList.CityColumn)
        End Function
        
        Public Sub SetCityNull()
            Me(Me.tableCustomerList.CityColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsCountryNull() As Boolean
            Return Me.IsNull(Me.tableCustomerList.CountryColumn)
        End Function
        
        Public Sub SetCountryNull()
            Me(Me.tableCustomerList.CountryColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsPostalCodeNull() As Boolean
            Return Me.IsNull(Me.tableCustomerList.PostalCodeColumn)
        End Function
        
        Public Sub SetPostalCodeNull()
            Me(Me.tableCustomerList.PostalCodeColumn) = System.Convert.DBNull
        End Sub
        
        Public Function Is_RegionNull() As Boolean
            Return Me.IsNull(Me.tableCustomerList._RegionColumn)
        End Function
        
        Public Sub Set_RegionNull()
            Me(Me.tableCustomerList._RegionColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CustomerListRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As CustomerListRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As CustomerListRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As CustomerListRow
            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 EmployeeListDataTable
        Inherits DataTable
        Implements System.Collections.IEnumerable
        
        Private columnEmployeeID As DataColumn
        
        Private columnFirstName As DataColumn
        
        Private columnLastName As DataColumn
        
        Private columnFullName As DataColumn
        
        Friend Sub New()
            MyBase.New("EmployeeList")
            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 EmployeeIDColumn As DataColumn
            Get
                Return Me.columnEmployeeID
            End Get
        End Property
        
        Friend ReadOnly Property FirstNameColumn As DataColumn
            Get
                Return Me.columnFirstName
            End Get
        End Property
        
        Friend ReadOnly Property LastNameColumn As DataColumn
            Get
                Return Me.columnLastName
            End Get
        End Property
        
        Friend ReadOnly Property FullNameColumn As DataColumn
            Get
                Return Me.columnFullName
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As EmployeeListRow
            Get
                Return CType(Me.Rows(index),EmployeeListRow)
            End Get
        End Property
        
        Public Event EmployeeListRowChanged As EmployeeListRowChangeEventHandler
        
        Public Event EmployeeListRowChanging As EmployeeListRowChangeEventHandler
        
        Public Event EmployeeListRowDeleted As EmployeeListRowChangeEventHandler
        
        Public Event EmployeeListRowDeleting As EmployeeListRowChangeEventHandler
        
        Public Overloads Sub AddEmployeeListRow(ByVal row As EmployeeListRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddEmployeeListRow(ByVal FirstName As String, ByVal LastName As String, ByVal FullName As String) As EmployeeListRow
            Dim rowEmployeeListRow As EmployeeListRow = CType(Me.NewRow,EmployeeListRow)
            rowEmployeeListRow.ItemArray = New Object() {Nothing, FirstName, LastName, FullName}
            Me.Rows.Add(rowEmployeeListRow)
            Return rowEmployeeListRow
        End Function
        
        Public Function FindByEmployeeID(ByVal EmployeeID As Integer) As EmployeeListRow
            Return CType(Me.Rows.Find(New Object() {EmployeeID}),EmployeeListRow)
        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 EmployeeListDataTable = CType(MyBase.Clone,EmployeeListDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New EmployeeListDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnEmployeeID = Me.Columns("EmployeeID")
            Me.columnFirstName = Me.Columns("FirstName")
            Me.columnLastName = Me.Columns("LastName")
            Me.columnFullName = Me.Columns("FullName")
        End Sub
        
        Private Sub InitClass()
            Me.columnEmployeeID = New DataColumn("EmployeeID", GetType(System.Int32), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnEmployeeID)
            Me.columnFirstName = New DataColumn("FirstName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFirstName)
            Me.columnLastName = New DataColumn("LastName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnLastName)
            Me.columnFullName = New DataColumn("FullName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnFullName)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columnEmployeeID}, true))
            Me.columnEmployeeID.AutoIncrement = true
            Me.columnEmployeeID.AllowDBNull = false
            Me.columnEmployeeID.ReadOnly = true
            Me.columnEmployeeID.Unique = true
            Me.columnFirstName.AllowDBNull = false
            Me.columnLastName.AllowDBNull = false
            Me.columnFullName.Expression = "[FirstName] + ' ' + [LastName]"
            Me.columnFullName.ReadOnly = true
        End Sub
        
        Public Function NewEmployeeListRow() As EmployeeListRow
            Return CType(Me.NewRow,EmployeeListRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New EmployeeListRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(EmployeeListRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.EmployeeListRowChangedEvent) Is Nothing) Then
                RaiseEvent EmployeeListRowChanged(Me, New EmployeeListRowChangeEvent(CType(e.Row,EmployeeListRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.EmployeeListRowChangingEvent) Is Nothing) Then
                RaiseEvent EmployeeListRowChanging(Me, New EmployeeListRowChangeEvent(CType(e.Row,EmployeeListRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.EmployeeListRowDeletedEvent) Is Nothing) Then
                RaiseEvent EmployeeListRowDeleted(Me, New EmployeeListRowChangeEvent(CType(e.Row,EmployeeListRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.EmployeeListRowDeletingEvent) Is Nothing) Then
                RaiseEvent EmployeeListRowDeleting(Me, New EmployeeListRowChangeEvent(CType(e.Row,EmployeeListRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveEmployeeListRow(ByVal row As EmployeeListRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class EmployeeListRow
        Inherits DataRow
        
        Private tableEmployeeList As EmployeeListDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableEmployeeList = CType(Me.Table,EmployeeListDataTable)
        End Sub
        
        Public Property EmployeeID As Integer
            Get
                Return CType(Me(Me.tableEmployeeList.EmployeeIDColumn),Integer)
            End Get
            Set
                Me(Me.tableEmployeeList.EmployeeIDColumn) = value
            End Set
        End Property
        
        Public Property FirstName As String
            Get
                Return CType(Me(Me.tableEmployeeList.FirstNameColumn),String)
            End Get
            Set
                Me(Me.tableEmployeeList.FirstNameColumn) = value
            End Set
        End Property
        
        Public Property LastName As String