NewRowNeeded事件当 VirtualMode 属性为 true 时，将在用户定位到 DataGridView 底部的新行时发生，适合给新行建立一些默认数据和按规则应该产生的数据，但此时不推荐添加新数据到后台数据表中。因为用户操作有太多的变数，可以把产生的默认值直接赋值给一个临时初始数据对像即可，在用户触发UserAddedRow事件后，再赋值到后台数据也不迟
Private pInitData As OuterExtendItemPrivate Sub xDataGridView_NewRowNeeded(sender As Object, e As System.Windows.Forms.DataGridViewRowEventArgs) Handles xDataGridView.NewRowNeededIf (mHalt) ThenReturnEnd IfpInitData = New OuterExtendItem()pInitData.mTitle = ""pInitData.mValue = ""End Sub
UserAddedRow事件是在编辑新行时触发，此时适合添加数据到后台数据表中
如例：
Private Sub xDataGridView_UserAddedRow(sender As Object, e As System.Windows.Forms.DataGridViewRowEventArgs) Handles xDataGridView.UserAddedRowIf (mHalt) ThenReturnEnd IfIf (_ExtendList Is Nothing) ThenReturnEnd IfIf (pInitData IsNot Nothing) Then_ExtendList.addNotEvent(pInitData)pInitData = NothingEnd IfEnd Sub
//参考的数据显示代码：
Private Sub xDataGridView_CellValueNeeded(sender As Object, e As System.Windows.Forms.DataGridViewCellValueEventArgs) Handles xDataGridView.CellValueNeededIf (mHalt) ThenReturnEnd IfIf (e.RowIndex < 0 OrElse e.RowIndex > _ExtendList.Count) ThenReturnEnd IfIf (e.RowIndex = _ExtendList.Count AndAlso pInitData IsNot Nothing) Then- '显示新行的代码
Select Case e.ColumnIndexCase xColumnTitle.Indexe.Value = pInitData.mTitleCase xColumnValue.Indexe.Value = pInitData.mValueEnd SelectElseWith _ExtendListSelect Case e.ColumnIndexCase xColumnTitle.Indexe.Value = .Item(e.RowIndex).mTitleCase xColumnValue.Indexe.Value = .Item(e.RowIndex).mValueEnd SelectEnd WithEnd IfEnd Sub
Private Sub xDataGridView_CellValuePushed(sender As Object, e As System.Windows.Forms.DataGridViewCellValueEventArgs) Handles xDataGridView.CellValuePushedIf (mHalt) ThenReturnEnd IfIf (e.RowIndex < 0 OrElse e.RowIndex >= _ExtendList.Count) ThenReturnEnd IfWith _ExtendList(e.RowIndex)TrySelect Case e.ColumnIndexCase xColumnTitle.Index.mTitle = e.ValueCase xColumnValue.Index.mValue = e.ValueEnd Select.raiseValueChangedEvent(_ExtendList, EventArgs.Empty) //触发列表变化事件Catch exp As ExceptionMyHub.mBase.mDebugLog.writerError(Me, exp)FinallyEnd TryEnd WithEnd Sub
'列表变化事件，此处只要根据实际数据，设置行数即可Private Sub listChanged(sender As Object, ByVal e As DBListChangedEventArgs(Of OuterExtendItem))If (Me.InvokeRequired) ThenMe.BeginInvoke(New EventHandler(Of DBListChangedEventArgs(Of OuterExtendItem))(AddressOf listChanged), New Object() {sender, e})ElsexDataGridView.RowCount = _ExtendList.Count + 1 //行数+1行xDataGridView.Refresh()End IfEnd Sub
RowsAdded事件，此事件是指在表格增加新行时触发，在初始化数据增加新行和后期编辑增加新行时都会触发此事件，而UserAddedRow事件一般是指在编辑阶段由用户操作触发的增加新行事件，二者有所区别，UserAddedRow事件使用率会比较高一点，RowsAdded事件适用于产生一些根据绑定数据需要额外显示的信息时。
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