用DataGridView.currentRow取值和用bindingsource.Current()取值的一些注意事项-优快云博客

本文链接：https://blog.youkuaiyun.com/GuanXX/article/details/3948762

本文介绍在使用DataGridView控件时如何正确地捕捉行变化事件。文章提供了两种方法：一种是使用CurrentCellChanged事件来响应行的变化，并通过currentSourcePosition变量进行控制；另一种是使用Bindingsource的CurrentChanged事件。

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当希望在DataGridView行变化做一些动作，比如当前行的图片，控制等等...
不要使用bindingsource 的类似 "PositionChanged"、"CurrentChanged"、"CurrentItemChanged"等事件，当用这种事件获得DataGridView中的值还是上一条的值(后证实是使用方法不对，呵呵...最后将会列出方法)
而要改用DataGridView 的 CurrentCellChanged 事件，只是这个事件有一个弊端是当列改变是也是有效的（小控制一下就行,如下面用currentSourcePosition去控制）
如下code
dim currentSourcePosition = 0
Private Sub POSSALESLINEDataGridView_CurrentCellChanged( _
                                                                         ByVal sender As Object, _
                                                                         ByVal e As System.EventArgs) _
                                                                         Handles POSSALESLINEDataGridView.CurrentCellChanged
        If _formStatus = formStatus.Loaded _
            And Me._sourceStatus = sourceStatus.POSSalesLine _
            And currentSourcePosition <> POSSALESTABLEPOSSALESLINEBindingSource.Position Then
            Dim _itemId As String = POSSALESLINEDataGridView.CurrentRow.Cells(1).Value
            Dim _lineNum As Integer = POSSALESLINEDataGridView.CurrentRow.Cells(0).Value
            Dim _fileName As String
            _fileName = findPicPath(_itemId)
            picItem = LoadImage(picItem, _fileName)

currentSourcePosition = POSSALESTABLEPOSSALESLINEBindingSource.Position

End If

End Sub

使用Bindingsource_CurrentChange的方法

Private Sub InventTableBindingSource_CurrentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles InventTableBindingSource.CurrentChanged
        If _formStatus = formStatus.Loaded Then
            Dim _itemId As String = InventTableMyDataGridView.CurrentRow.Cells(0).Value
            Dim _position As Integer = InventTableBindingSource.Position
            Dim _itemId2 As String = InventTableBindingSource.Current(1).ToString()
            MessageBox.Show("ItemId:" & _itemId & " - ItemId 2: " & _itemId2 & " - position:" & _position)
        End If

End Sub