选中两个时禁用 GroupBox 中的其他复选框

Question

 Private Sub AllBoxes_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged, CheckBox2.CheckedChanged, CheckBox3.CheckedChanged, CheckBox4.CheckedChanged, CheckBox5.CheckedChanged, CheckBox6.CheckedChanged

    Dim qty As Int16 = 0
    Dim cb As CheckBox


    For Each cb In GroupBox8.Controls.OfType(Of CheckBox)
        If cb.Checked Then
            qty += 1
        End If
    Next

    If qty = 2 Then

        For Each cb In GroupBox8.Controls.OfType(Of CheckBox)
            If Not cb.Checked Then
                cb.Enabled = False
            End If
        Next
    Else

        For Each cb In GroupBox8.Controls.OfType(Of CheckBox)
            cb.Enabled = True
        Next
    End If
End Sub

它只是不起作用。 groupbox 的名称是 groupbox8，上面有 6 个复选框。我需要选中两个复选框。

Answer 1

您可以使用一些 Linq 来简化很多 CheckedChanged 事件处理程序

Private Sub AllBoxes_CheckedChanged(sender As Object, e As EventArgs)

    ' Get all checkboxes in the groupBox8
    Dim checks = groupBox8.Controls.OfType(Of CheckBox)()
    ' Count how many are checked
    Dim cnt = checks.Where(Function(x) x.Checked).Count()

    If cnt < 2 Then
        ' Enable all, avoid an if and don't care if already enabled
        For Each c In checks
            c.Enabled = True
        Next
    Else
        ' Disable all except the two checked...
        For Each k In checks.Where(Function(x)  Not x.Checked)
            k.Enabled = False
        Next
    End If
End Sub