ds3.vb

来自「是一个工资的管理系统 利用的是VB.NET和sql2000来完成的」· VB 代码 · 共 424 行 · 第 1/2 页

        
        Public Event courseRowDeleted As courseRowChangeEventHandler
        
        Public Event courseRowDeleting As courseRowChangeEventHandler
        
        Public Overloads Sub AddcourseRow(ByVal row As courseRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddcourseRow(ByVal cno As String, ByVal cname As String, ByVal cpno As String, ByVal ccredit As String) As courseRow
            Dim rowcourseRow As courseRow = CType(Me.NewRow,courseRow)
            rowcourseRow.ItemArray = New Object() {cno, cname, cpno, ccredit}
            Me.Rows.Add(rowcourseRow)
            Return rowcourseRow
        End Function
        
        Public Function FindBycno(ByVal cno As String) As courseRow
            Return CType(Me.Rows.Find(New Object() {cno}),courseRow)
        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 courseDataTable = CType(MyBase.Clone,courseDataTable)
            cln.InitVars
            Return cln
        End Function
        
        Protected Overrides Function CreateInstance() As DataTable
            Return New courseDataTable
        End Function
        
        Friend Sub InitVars()
            Me.columncno = Me.Columns("cno")
            Me.columncname = Me.Columns("cname")
            Me.columncpno = Me.Columns("cpno")
            Me.columnccredit = Me.Columns("ccredit")
        End Sub
        
        Private Sub InitClass()
            Me.columncno = New DataColumn("cno", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columncno)
            Me.columncname = New DataColumn("cname", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columncname)
            Me.columncpno = New DataColumn("cpno", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columncpno)
            Me.columnccredit = New DataColumn("ccredit", GetType(System.String), Nothing, System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnccredit)
            Me.Constraints.Add(New UniqueConstraint("Constraint1", New DataColumn() {Me.columncno}, true))
            Me.columncno.AllowDBNull = false
            Me.columncno.Unique = true
        End Sub
        
        Public Function NewcourseRow() As courseRow
            Return CType(Me.NewRow,courseRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            Return New courseRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(courseRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.courseRowChangedEvent) Is Nothing) Then
                RaiseEvent courseRowChanged(Me, New courseRowChangeEvent(CType(e.Row,courseRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.courseRowChangingEvent) Is Nothing) Then
                RaiseEvent courseRowChanging(Me, New courseRowChangeEvent(CType(e.Row,courseRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.courseRowDeletedEvent) Is Nothing) Then
                RaiseEvent courseRowDeleted(Me, New courseRowChangeEvent(CType(e.Row,courseRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.courseRowDeletingEvent) Is Nothing) Then
                RaiseEvent courseRowDeleting(Me, New courseRowChangeEvent(CType(e.Row,courseRow), e.Action))
            End If
        End Sub
        
        Public Sub RemovecourseRow(ByVal row As courseRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class courseRow
        Inherits DataRow
        
        Private tablecourse As courseDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tablecourse = CType(Me.Table,courseDataTable)
        End Sub
        
        Public Property cno As String
            Get
                Return CType(Me(Me.tablecourse.cnoColumn),String)
            End Get
            Set
                Me(Me.tablecourse.cnoColumn) = value
            End Set
        End Property
        
        Public Property cname As String
            Get
                Try 
                    Return CType(Me(Me.tablecourse.cnameColumn),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.tablecourse.cnameColumn) = value
            End Set
        End Property
        
        Public Property cpno As String
            Get
                Try 
                    Return CType(Me(Me.tablecourse.cpnoColumn),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.tablecourse.cpnoColumn) = value
            End Set
        End Property
        
        Public Property ccredit As String
            Get
                Try 
                    Return CType(Me(Me.tablecourse.ccreditColumn),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.tablecourse.ccreditColumn) = value
            End Set
        End Property
        
        Public Function IscnameNull() As Boolean
            Return Me.IsNull(Me.tablecourse.cnameColumn)
        End Function
        
        Public Sub SetcnameNull()
            Me(Me.tablecourse.cnameColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IscpnoNull() As Boolean
            Return Me.IsNull(Me.tablecourse.cpnoColumn)
        End Function
        
        Public Sub SetcpnoNull()
            Me(Me.tablecourse.cpnoColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsccreditNull() As Boolean
            Return Me.IsNull(Me.tablecourse.ccreditColumn)
        End Function
        
        Public Sub SetccreditNull()
            Me(Me.tablecourse.ccreditColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    <System.Diagnostics.DebuggerStepThrough()>  _
    Public Class courseRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As courseRow
        
        Private eventAction As DataRowAction
        
        Public Sub New(ByVal row As courseRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As courseRow
            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