Question

我正在为我的VB课程创建一个比萨饼订购系统。我可以为比萨饼编码一个顶部，但是当我尝试添加更多然后一个顶部时，我得到了带有两个浇头的物品，还有另外两个只有一个浇头的比萨饼。如果在组框中只选择了一定数量的复选框，是否有办法运行if语句？

Private Sub AddItems()

   'Declare Topping Variables 
    Dim topping1 As String = "Pepperoni"
    Dim topping2 As String = "Bacon"
    Dim topping3 As String = "Ham"

    'Declare Size Variables 
    Dim strPersonal As String = "Persoanl"
    Dim strSmall As String = "Small"
    Dim strMedium As String = "Medium"
    Dim strLarge As String = "Large"
    Dim strExLarge As String = "Extra Large"

    'Personal Single Item
    If radPersonal.Checked = True And chkPepperoni.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping1)
    End If
    If radPersonal.Checked = True And chkBacon.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping2)
    End If
    If radPersonal.Checked = True And chkHam.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping3)
    End If

    'Personal Two Items
    If radPersonal.Checked = True And chkPepperoni.Checked = True And chkBacon.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping1 & " and " & topping2)
    End If
    If radPersonal.Checked = True And chkBacon.Checked = True And chkHam.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping2 & " and " & topping3)
    End If
    If radPersonal.Checked = True And chkHam.Checked = True And chkPepperoni.Checked = True Then
        CheckedListBox1.Items.Add(strPersonal & " with " & topping3 & " and " & topping1)
    End If
End Sub

http://i.stack.imgur.com/VafZe.png

Answer 1

首先，您不应该六次测试radPersonal.Checked。你应该只测试一次然后嵌套其余部分。

其次，您不应该首先单独测试chkPepperoni.Checked，然后再组合测试。如果你这样做，如果它被组合检查，它将匹配两个测试。您应首先测试组合，然后仅在组合不匹配时单独测试。这就是我倾向于这样做的方式：

If radPersonal.Checked Then
    If chkPepperoni.Checked Then
        If chkBacon.Checked Then
            'pepperoni and bacon
        ElseIf chkHam.Checked Then
            'pepperoni and ham
        Else
            'pepperoni only
        End If
    ElseIf chkBacon.Checked Then
        If chkHam.Checked Then
            'bacon and ham
        Else
            'bacon only
        End If
    ElseIf chkHam.Checked Then
        'ham only
    End If
End If

VB - 如果只检查了一定数量的复选框，则运行if语句？

1 个答案: