當兩個選中時禁用GroupBox中的其他複選框

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的名字是groupbox8，它有6個複選框。我需要選擇兩個複選框。

Answer 1

您可以使用LINQ的一點的

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