Question

字符串看起来像11,33,44 我将三个字符串拆分为3个文本框，然后当我执行ListBox1.Items.Remove（ListBox1.SelectedItem）时，它不起作用。

它表示ss.Split（“，”）对象引用未设置为对象的实例。

这是我的代码

    Private Sub ListBox1_SelectedIndexChanged(sender As System.Object, e As        System.EventArgs) Handles ListBox1.SelectedIndexChanged
    Dim ss As String = ListBox1.SelectedItem

    Dim aryTextFile(2) As String
    aryTextFile = ss.Split(",")


    TextBox1.Text = (aryTextFile(0))
    TextBox2.Text = (aryTextFile(1))
    TextBox3.Text = (aryTextFile(2))

    ss = String.Join(",", aryTextFile)

End Sub

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

    ListBox1.Items.Add(TextBox1.Text + "," + TextBox2.Text + "," + TextBox3.Text)
End Sub

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click

    ListBox1.Items.Remove(ListBox1.SelectedItem)


End Sub

Answer 1

当您按ListBox时从Button2删除某个项目时，正在调用SelectedIndexChanged的{{1}}。在那里，所选项目将一无所获，因此要解决此问题，请在分配字符串变量之前在ListBox1内添加以下行。

SelectedIndexChanged event

Answer 2

试试这个：

listbox.selecteditem.remove()

它将删除listbox中的所选项目。

如何删除vb中列表框中的项目

2 个答案: