检查组合框中的重复项

Question

我试图让我的代码检查组合框中的重复项。

这是我的代码，但我不知道我哪里出错了

Private Sub flavorsComboBox_RegionChanged(sender As Object, e As EventArgs) Handles Me.Load
    flavorsComboBox.Items.Add("Chocolate Almond")
    flavorsComboBox.Items.Add("Espresso Roast")
    flavorsComboBox.Items.Add("Jamaica Blue Mountain")
    flavorsComboBox.Items.Add("Kona Blend")
    flavorsComboBox.Items.Add("Vanilla Hazelnut")
End Sub

Private Sub addButton_Click(sender As Object, e As EventArgs) Handles addButton.Click
    Dim i As Integer = 0
    Dim flavorlist As Integer = flavorsComboBox.Items.Count
    Dim flavors As Integer = CInt(flavorsComboBox.Text)
    Do While (i < flavorlist - 1)
        If (flavorsComboBox.Items(i) = flavorlist) Then
            MessageBox.Show("Error!")
        End If
        i += 1
    Loop

Answer 1

你的while循环中的界限是错误的，括号使用不正常，我认为你是将你的变量混合到某个地方。

以下内容将以更易读的方式迭代集合：

Dim newflavor As string = flavorsComboBox.Text
for each flavor as string in flavorsComboBox.Items
    If flavor = newflavor Then
        MessageBox.Show("Error!")
    End If
next

您可能需要在相等运算符的两侧使用.ToLower。