使用列表框多选从列表中返回多个索引时出错

Question

VBA 新手，有点沮丧。试图为我的老师们制作一个表格来简化文书工作。

我有一个表格中的列表 1. 苹果
2. 橙色
3.葡萄

如果用户要从列表中选择苹果和葡萄，我希望单元格只有索引。所以要在单元格中打印 (1,3)。我不想要这些话。

我当前的代码

Private Sub SpedAccomAddBtn_Click()

'variable to count multiple selections'
VarSped = " "

'loop to keep track of indexes of selected items'
For X = 0 To Me.SpedListBx.ListCount - 1 'count through list
    If Me.SpedListBx.Selected(X) Then    
        If VarSped = " " Then  'if blank then record first item'
            VarSped = Me.SpedListBx.ListIndex + 1 'first selected item. +1 because excel is a 0 based index'
        Else 'if not the first selection add a , between selections'
            VarSped = VarSped & "," & Me.SpedListBx.ListIndex + 1
        End If
    End If
Next X

ThisWorkbook.Sheets("Master SPED Sheet").Range("c4") = VarSped 'print to cell'

如果我使用前面选择 Apple 和 Grape 的示例，我会得到 (3,3) 而不是 (1,3)。我不明白为什么 VarSped 不断被覆盖。 （我是编码新手，我必须评论所有内容，所以我觉得我知道自己在做什么）

Answer 1

试试这个，看看如何在循环中引用当前项目：

Private Sub SpedAccomAddBtn_Click()

Dim VarSped As String
Dim x As Integer

'variable to count multiple selections'
VarSped = " "

'loop to keep track of indexes of selected items'
For x = 0 To Me.SpedListBx.ListCount - 1 'count through list
    If Me.SpedListBx.Selected(x) Then
        If VarSped = " " Then  'if blank then record first item'
            VarSped = Me.SpedListBx.List(x) 'first selected item. +1 because excel is a 0 based index'
        Else 'if not the first selection add a , between selections'
            VarSped = VarSped & "," & Me.SpedListBx.List(x)
        End If
    End If
Next x

ThisWorkbook.Sheets("Master SPED Sheet").Range("c4") = VarSped 'print to cell'

End Sub

Answer 2

您的循环迭代器已经是您的项目位置：只需添加一个即可管理基于 0 的列表：

Option Explicit

Private Sub SpedAccomAddBtn_Click()
    Dim VarSped As String ' a string is always initialized with a null string, i.e. with a "" string. hence no need for a 'VarSped = ""' statement

    Dim X As Long
    For X = 0 To Me.SpedListBx.ListCount - 1 'count through list
        If Me.SpedListBx.Selected(X) Then VarSped = VarSped & "," & X + 1
    Next

    If VarSped <> vbNullString Then ThisWorkbook.Sheets("Master SPED Sheet").Range("c4") = Mid$(VarSped, 2) ' print 'VarSped' only if user selected something (i.e. 'VarSped' is not a not string). Mid$() function is used to skip the first character which is a colon 
End Sub

养成将Option Explicit 放在每个模块的最顶层并显式声明所有变量的习惯：这样既可以节省大量调试时间，又可以让您更好地控制代码