如果我在代码上创建它，如何获得 "item"

Question

    Public WithEvents newListBox As Windows.Forms.ListBox
        newListBox = New Windows.Forms.ListBox
    newListBox.Name = "ListBox" & i
    newListBox.Height = 44
    newListBox.Width = 250
    newListBox.Top = 10 + i * 50
    newListBox.Left = 150
    newListBox.Tag = i
    Me.Controls.Add(newListBox)

所以我创建了一个按钮来创建一个列表框，并在创建时为每个列表框设置了一个名称。此列表框充满了我 select 的文件，但我如何从指定的列表框中获取值，例如

For Each nome In ListBox1.Items

...

如果我无法在主代码上调用 ListBox1，因为它尚未创建。

那我该怎么办？我怎样才能得到最后创建的列表框的正确列表框。

Answer 1

你的问题是编译器在编译时无法知道ListBoxi。它直到运行时才创建。

Friend WithEvents newListBox As ListBox

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Static i As Integer = 1
    newListBox = New ListBox
    newListBox.Name = "ListBox" & i
    newListBox.Height = 44
    newListBox.Width = 250
    newListBox.Top = 10 + i * 50
    newListBox.Left = 150
    newListBox.Tag = i
    Me.Controls.Add(newListBox)
    i += 1
End Sub


Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
    Dim listBoxi = TryCast(Controls.Find("ListBox1", True).FirstOrDefault(), ListBox)
    For Each item In listBoxi.Items

    Next
End Sub

如果我在代码上创建它，如何获得 "item"

How to get a "item" if I created it on the code

vb.net

variables

button

listbox

call