如何解决“集合索引必须在1到集合大小的范围内”？

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问题描述

当我运行代码并经过两个表单后，我从一个列表框中选择项目，从另一个列表框中选择另一个项目，然后单击land按钮。之后我收到一条错误，说收集索引必须在1到集合大小的范围内。

when i run the code and after going through two forms i select item from one list box and another item from another listbox and click on land button. after that i get an error saying "Collection index must be in the range 1 to the size of the collection."

Private Sub btn_land_plane_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_land_plane.Click<br />
<br />
        Dim runwayindexno As Integer<br />
        Dim runwayfrmselected As Form<br />
        runwayindexno = lst_runways.SelectedIndex<br />
        runwayfrmselected = runway(runwayindexno)<br />
<br />
    End Sub

突出显示[== runway（runwayindexno）]并显示错误。

我寻找的解决方案找不到与我的代码相关的解决方案。我不知道要包含多少代码

如果需要我可以发布。

如果您需要更多信息请咨询并且非常感谢任何帮助。

It highlight [==runway(runwayindexno)] and displays the error.

i have looked for the solution cant find one that relates to my code. i don't know how much code
to include if need i can post.
if you need any more information please ask and any help is much appreciated.

推荐答案

Option Base 1

指令。

这具有将数组从1索引到Count的效果。

而 ListBox 的SelectedIndex 返回介于0和（Count-1）之间的值（对应于 VB.NET中的Option Base 0 。

您有两种选择：

- 或者你设置选项基础0

- 或者你转换通过添加它获得的每个索引1

前者可能是最好的，因为这将导致一种一致性y你的应用程序中有数组索引。

directive.

This has the effect of indexing arrays from 1 to Count.
Whereas the SelectedIndex of a ListBox returns a value between 0 and (Count - 1) (which corresponds to Option Base 0 in VB.NET).

You then have two alternatives :
- OR you set Option Base 0
- OR you convert every index obtained by adding it 1

The former is probably the best one, as this will lead to a kind of consistency with array indices in your application.

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option