vb.net – 在tabcontrol MouseClick事件上单击了哪个选项卡

TabControl有一个属性SELEctedIndex.这是当前所选选项卡的从零开始的数字. (还有另一个名为SELEctedTab的属性,直接引用选定的标签页对象.)

您可以将事件处理程序挂钩到事件SELEctedIndexChanged,以便在用户选择另一个选项卡时收到通知：

Private Sub myTabControl_SELEctedIndexChanged(ByVal sender As Object,_
                                              ByVal e As System.EventArgs) _
            Handles myTabControl.SELEctedIndexChanged

    Dim indexOfSELEctedTab As Integer = myTabControl.SELEctedIndex
    Dim SELEctedTab As System.Windows.Forms.TabPage = myTabControl.SELEctedTab

    ...

End Sub

(请注意,您可能希望另外保护您的代码免受SELEctedIndex具有无效值的情况,例如-1.)

编辑(在评论OP后添加)：

如果SELEctedIndexChanged不适合您,因为您需要捕获用户对所有鼠标按钮的操作,您可以使用TabControl的GetTabRect方法,如下所示：

Private Sub myTabControl_MouseClick(sender As Object,_
                                    e As System.Windows.Forms.MouseEventArgs) _
            Handles myTabControl.MouseClick

    ...

    For tabIndex As Integer = 0 To myTabControl.TabCount - 1
        If myTabControl.GetTabRect(tabIndeX).Contains(e.LOCATIOn) Then
           ...  ' clicked on tab with index tabIndex '
        End If
    Next

    ...

End Sub