组合框和 My.Settings

Question

我正在使用 My.Settings 为组合框中的每个项目存储不同的文本

看起来像这样

我在项目设置中添加了 5 个类型为“String”的设置

我正在使用此代码

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If cmbperiod.SelectedItem = 1 Then
        txtnote.Text = My.Settings.first()
    ElseIf cmbperiod.SelectedItem = 2 Then
        txtnote.Text = My.Settings.second()
    ElseIf cmbperiod.SelectedItem = 3 Then
        txtnote.Text = My.Settings.third()
    ElseIf cmbperiod.SelectedItem = 4 Then
        txtnote.Text = My.Settings.fourth()
    ElseIf cmbperiod.SelectedItem = 5 Then
        txtnote.Text = My.Settings.fifth()
    End If
End Sub

我可以从 my.settings 加载值，但我该如何编辑它。

例如，我想在第三个期间键入注释并在 Form_Closing 上将该文本保存到我的 settings.third 中，以便下次打开表单时它会被加载。

安乐

Answer 1

  Private Sub Form_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
        If cmbperiod.SelectedItem = 1 Then
            My.Settings.first() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 2 Then
            My.Settings.second() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 3 Then
            My.Settings.third() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 4 Then
            My.Settings.fourth() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 5 Then
            My.Settings.fifth() = txtnote.Text
        End If
    End Sub

这将解决您的问题，但只会保存当前选择的值。
因此，例如，如果您想保存多个值，则必须添加一个类似 txtnote.leave 的命令，该命令将捕获当前更改。
例如：

Private Sub txtnote_Leave(sender As Object, e As EventArgs) Handles txtnote.Leave
        If cmbperiod.SelectedItem = 1 Then
            My.Settings.first() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 2 Then
            My.Settings.second() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 3 Then
            My.Settings.third() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 4 Then
            My.Settings.fourth() = txtnote.Text
        ElseIf cmbperiod.SelectedItem = 5 Then
            My.Settings.fifth() = txtnote.Text
        End If
    End Sub

在此之后，您可能想要执行SelectedIndexChanged，因此当您选择不同的ComboBox 值时，您也可以加载txtnote 值。
您将这样做：

Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
        If cmbperiod.SelectedItem = 1 Then
            txtnote.Text = My.Settings.first()
        ElseIf cmbperiod.SelectedItem = 2 Then
            txtnote.Text = My.Settings.second()
        ElseIf cmbperiod.SelectedItem = 3 Then
            txtnote.Text = My.Settings.third()
        ElseIf cmbperiod.SelectedItem = 4 Then
            txtnote.Text = My.Settings.fourth()
        ElseIf cmbperiod.SelectedItem = 5 Then
            txtnote.Text = My.Settings.fifth()
        End If
    End Sub