dscustomers.vb

用VB.NET写的人员管理系统,可用于二次开发.

        Public Event CustomersRowDeleting As CustomersRowChangeEventHandler
        
        Public Overloads Sub AddCustomersRow(ByVal row As CustomersRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddCustomersRow(ByVal Address As String, ByVal City As String, ByVal CompanyName As String, ByVal ContactName As String) As CustomersRow
            Dim rowCustomersRow As CustomersRow = CType(Me.NewRow,CustomersRow)
            rowCustomersRow.ItemArray = New Object() {Address, City, CompanyName, ContactName}
            Me.Rows.Add(rowCustomersRow)
            Return rowCustomersRow
        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 CustomersDataTable = CType(MyBase.Clone,CustomersDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New CustomersDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columnAddress = Me.Columns("Address")
            Me.columnCity = Me.Columns("City")
            Me.columnCompanyName = Me.Columns("CompanyName")
            Me.columnContactName = Me.Columns("ContactName")
        End Sub
        
        Private Sub InitClass()
            Me.columnAddress = New DataColumn("Address", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnAddress)
            Me.columnCity = New DataColumn("City", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCity)
            Me.columnCompanyName = New DataColumn("CompanyName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCompanyName)
            Me.columnContactName = New DataColumn("ContactName", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnContactName)
        End Sub
        
        Public Function NewCustomersRow() As CustomersRow
            Return CType(Me.NewRow,CustomersRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New CustomersRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(CustomersRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.CustomersRowChangedEvent) Is Nothing) Then
                RaiseEvent CustomersRowChanged(Me, New CustomersRowChangeEvent(CType(e.Row,CustomersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.CustomersRowChangingEvent) Is Nothing) Then
                RaiseEvent CustomersRowChanging(Me, New CustomersRowChangeEvent(CType(e.Row,CustomersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.CustomersRowDeletedEvent) Is Nothing) Then
                RaiseEvent CustomersRowDeleted(Me, New CustomersRowChangeEvent(CType(e.Row,CustomersRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.CustomersRowDeletingEvent) Is Nothing) Then
                RaiseEvent CustomersRowDeleting(Me, New CustomersRowChangeEvent(CType(e.Row,CustomersRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveCustomersRow(ByVal row As CustomersRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CustomersRow
        Inherits DataRow
        
        Private tableCustomers As CustomersDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableCustomers = CType(Me.Table,CustomersDataTable)
        End Sub
        
        Public Property Address As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomers.AddressColumn),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.tableCustomers.AddressColumn) = value
            End Set
        End Property
        
        Public Property City As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomers.CityColumn),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.tableCustomers.CityColumn) = value
            End Set
        End Property
        
        Public Property CompanyName As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomers.CompanyNameColumn),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.tableCustomers.CompanyNameColumn) = value
            End Set
        End Property
        
        Public Property ContactName As String
            Get
                Try 
                    Return CType(Me(Me.tableCustomers.ContactNameColumn),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.tableCustomers.ContactNameColumn) = value
            End Set
        End Property
        
        Public Function IsAddressNull() As Boolean
            Return Me.IsNull(Me.tableCustomers.AddressColumn)
        End Function
        
        Public Sub SetAddressNull()
            Me(Me.tableCustomers.AddressColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsCityNull() As Boolean
            Return Me.IsNull(Me.tableCustomers.CityColumn)
        End Function
        
        Public Sub SetCityNull()
            Me(Me.tableCustomers.CityColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsCompanyNameNull() As Boolean
            Return Me.IsNull(Me.tableCustomers.CompanyNameColumn)
        End Function
        
        Public Sub SetCompanyNameNull()
            Me(Me.tableCustomers.CompanyNameColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsContactNameNull() As Boolean
            Return Me.IsNull(Me.tableCustomers.ContactNameColumn)
        End Function
        
        Public Sub SetContactNameNull()
            Me(Me.tableCustomers.ContactNameColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class CustomersRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As CustomersRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As CustomersRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As CustomersRow
            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