VB.net 2012 - 从输入框中检索输入并将列表框的文本属性更改为用户输入

Question

我对 vb.net 和一般编程非常陌生，所以我希望我能得到一个非常简单的答案。

我编写了一个输入框，用于检索用户输入并将其存储在变量 salesQty 中。

    salesQty =
    InputBox("Enter the sales quantity for " & itemListBox.Text, "Daily Sales Entry", "0")

之后，我尝试将 Listbox 的 text 属性设置为等于 salesQty（假设它会更改所选项目的显示文本），但它似乎根本没有改变。

    salesQtyListBox.Text = salesQty

这是完整的代码：

    Private Sub enterSalesQtyButton_Click(sender As Object, e As EventArgs) Handles enterSalesQtyButton.Click
    'Retrieve number of items in itemList Box and sets it as variable numItems
    Dim numItems As Integer = itemListBox.Items.Count

    'Declare index to use as counter
    Dim index As Integer

    Do While index < numItems
        index = index + 1
        Dim salesQty As String
        salesQty =
        InputBox("Enter the sales quantity for " & itemListBox.Text, "Daily Sales Entry", "0")

        'Changes Sales Quantity text to the users input that has been stored in SalesQty
        salesQtyListBox.Text = salesQty


        'Selects next index until all have been selected
        If itemListBox.SelectedIndex < numItems - 1 Then
            itemListBox.SelectedIndex = itemListBox.SelectedIndex + 1
        End If
    Loop

    enterSalesQtyButton.Enabled = False
    applyDailySalesButton.Enabled = True

End Sub

Answer 1

 Private Sub enterSalesQtyButton_Click(sender As Object, e As EventArgs) Handles enterSalesQtyButton.Click

        ' Declare the varible outside the loop,
        ' because we dont need a new string every time.
        Dim salesQty As String = ""

        ' Loops through all the items in the list box.
        For i As Integer = 0 To itemListBox.Items.Count - 1

            ' Gets the user quantity for the current item (the "i" item of the list box).
            salesQty = InputBox("Enter the sales quantity for " & itemListBox.Items(i), "Daily Sales Entry", "0")

            ' Changes the "i" item according to the user data.
            itemListBox.Items(i) = salesQty
        Next

  End Sub

Answer 2

要将项目添加到列表框，请使用以下代码：

salesQtyListBox.items.add(salesQty)

我不确定这是否完全回答了您的问题，但希望这会有所帮助。