Visual Basic动态文本框

Question

应用和代码

Private Sub PriceBox_Click(sender As Object, e As EventArgs) Handles PriceBox.Click
    If CmbSize.SelectedIndex = 0 Then
        PriceBox.Text = "£30"
    ElseIf CmbSize.SelectedIndex = 1 Then
        PriceBox.Text = "£40"
    ElseIf CmbSize.SelectedIndex = 2 Then
        PriceBox.Text = "£50"
    End If

End Sub

此代码有效，但仅在单击时有效，选择组合框索引后，我需要使用它来自动更改

Answer 1

如果只希望用户更改索引而不是程序更改，请使用

SelectionChangeCommitted

https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.combobox.selectionchangecommitted?view=netframework-4.7.2

Answer 2

您将需要处理CmbSize控件上的SelectedIndexChanged，如https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.combobox.selectedindexchanged?view=netframework-4.7.2

Answer 3

组合框有SelectedIndexChanged-event，您可以使用：

Private Sub CmbSize_Changed(sender As Object, e As EventArgs) Handles CmbSize.SelectedIndexChanged   

End Sub