如何使列表框中的某些行不可编辑

Question

我在我的项目中有一个编辑按钮，它允许我编辑列表框中的行，但有些行我不想编辑，我该如何做到这一点。

我想作出第4,9,14,19,24,29,34,39,44,49,54,59,64,69,74,79,84,94,99的第4行，编辑。

我想applicationdate行是不可编辑的，有没有办法让我的代码行不可编辑。

Answer 1

处理SelectedIndexChanged event。每次ListBox控件中的项目选择更改时都会引发此事件。

在此事件的事件处理程序方法中，检查当前选定项目的索引。如果它是您想要编辑的文件，请启用编辑按钮。否则，禁用编辑按钮。

例如：

Private Sub myListBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles myListBox.SelectedIndexChanged 
    ' Only allow editing of items with an odd-numbered index. 
    ' (This isn't very useful, just a demonstration. You can use any criteria you 
    ' want to determine whether editing should be allowed for the current item.) 
    btnEdit.Enabled = myListBox.SelectedIndex Mod 2 
End Sub 

Answer 2

Private Sub myListBox_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs) Handles myListBox.SelectedIndexChanged 
    ' Only allow editing of items with an odd-numbered index. 
    ' (This isn't very useful, just a demonstration. You can use any criteria you 
    ' want to determine whether editing should be allowed for the current item.) 
    Dim unedit() as integer={4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79, 84, 89, 94, 99} 
    dim i as integer 
    for i = 0 unedit.count-1 
    if myListBox.SelectedIndex=unedit(i) then 
     btnEdit.Enabled = false 
     exit for 
    end if 
End Sub