vb.net - 如何交换对象列表中的索引

Question

所以我有一个如下所示的类:

Public Class parameters
    Public Property test As String
    Public Property test_type As String
    Public Property user_test_name As String
    Public Property meas As String
    Public Property spec_min As String
    Public Property spec_max As String
    Public Property spec_unit As String

    Public Overrides Function ToString() As String
        Return user_test_name
    End Function
End Class

我已经将每个对象写在一个对象列表中，并将它们写入一个列表框。

我想上下移动列表框中的项目，我已经通过以下代码成功完成了:

Private Sub up_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles up.Click
    'Move up

    'Make sure our item is not the first one on the list.
    If ListBox1.SelectedIndex > 0 Then

        Dim I = ListBox1.SelectedIndex - 1
        ListBox1.Items.Insert(I, ListBox1.SelectedItem)
        ListBox1.Items.RemoveAt(ListBox1.SelectedIndex)
        ListBox1.SelectedIndex = I
    End If

End Sub

Private Sub down_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles down.Click

    'Move down

    'Make sure our item is not the last one on the list.
    If ListBox1.SelectedIndex < ListBox1.Items.Count - 1 Then
        'Insert places items above the index you supply, since we want
        'to move it down the list we have to do + 2
        Dim I = ListBox1.SelectedIndex + 2
        ListBox1.Items.Insert(I, ListBox1.SelectedItem)
        ListBox1.Items.RemoveAt(ListBox1.SelectedIndex)
        ListBox1.SelectedIndex = I - 1

    End If
End Sub

但我也希望列表中的实际索引随着所选项目向上或向下移动而改变。这样，当我导出文件时，我可以保留用户选择的顺序。请指教？

Answer 1

不要交换索引；交换值。有点像

Dim tempParam as parameters 

tempParam = myList(I)
myList(I) = myList(I-1)
myList(I-1) = tempParam