获取DataGridViewComboboxColumn SelectedValue（VB.Net）
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我需要在DataGridView中获取ComboBox的选定值。我有部分工作，但如果更改网格中的另一个ComboBox，则会收到Null引用异常。这是我的代码：
Private Sub dgvSampleList_EditingControlShowing(ByVal sender As Object, ByVal e As DataGridViewEditingControlShowingEventArgs) Handles dgvSampleList.EditingControlShowing
Dim comboBox As ComboBox = CType(e.Control, ComboBox)
If (comboBox IsNot Nothing) Then
\'Remove an existing event-handler
RemoveHandler comboBox.SelectedIndexChanged, New EventHandler(AddressOf ComboBox_SelectedIndexChanged)
\'Add the event handler.
AddHandler comboBox.SelectedIndexChanged, New EventHandler(AddressOf ComboBox_SelectedIndexChanged)
End If
End Sub
Private Sub ComboBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim comboBox As ComboBox = CType(sender, ComboBox)
\'Display selected value
MsgBox(\"ProgramID: \" & comboBox.SelectedValue.ToString)
End Sub
没有找到相关结果
已邀请:
3 个回复
味芯憨
属性之前测试comboBox是否为空：Private Sub ComboBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Dim comboBox As ComboBox = CType(sender, ComboBox) \'Display selected value If comboBox IsNot Nothing Then MsgBox(\"ProgramID: \" & comboBox.SelectedValue.ToString) End If End Sub闪脖
而不是希望能有所帮助。细瑞
Dim comboBoxCol As New DataGridViewComboBoxColumn Dim gol As Integer = 0 Dim comboBox As ComboBox Private Sub dgvSampleList_EditingControlShowing(ByVal sender As Object, ByVal e As DataGridViewEditingControlShowingEventArgs) Handles DGVItems.EditingControlShowing comboBox = CType(e.Control, ComboBox) If (comboBox IsNot Nothing) Then \'Add the event handler. AddHandler comboBox.SelectedIndexChanged, New EventHandler(AddressOf ComboBox_SelectedIndexChanged) gol = 1 \'AddHandler comboBox.SelectionChangeCommitted, New EventHandler(AddressOf ComboBox_SelectedIndexChanged) End If End Sub Private Sub ComboBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) comboBox = CType(sender, ComboBox) If gol = 1 Then Dim item As String = comboBox.Text MsgBox(item) gol = 0 End If End Sub