防止重复项从Listbox1添加到Listbox2

Question

我有两个列表框。 ListBox1 具有项目列表，用户可以通过双击项目或按添加按钮来选择这些项目并将其传输到 ListBox2。我现在要做的是防止用户在 ListBox2 中添加重复项。如果检测到重复项，则会出现一条消息提示“项目已包含”并结束代码。我猜这可以用 contains 来完成？但我不知道该怎么做。我有以下代码：

'Report Listing
Private Sub UserForm_Initialize()
    'List of Reports
    With ListBox1
        .AddItem "Report 1"
        .AddItem "Report 2"
        .AddItem "Report 3"
        .AddItem "Report 4"
        .AddItem "Report 5"
        .AddItem "Report 6"
    End With
End Sub

'Add selection to ListBox2
Private Sub AddButton_Click()

        With ListBox1
        Dim itemIndex As Integer
        For itemIndex = .ListCount - 1 To 0 Step -1
            If .Selected(itemIndex) Then
                ListBox2.AddItem .List(itemIndex)
            End If
        Next itemIndex
    End With

End Sub

    'Double click to Add
Private Sub ListBox1_DblClick(ByVal Cancel As MSForms.ReturnBoolean)
    ListBox2.AddItem ListBox1.List(ListBox1.ListIndex)
End Sub

Answer 1

这样的事情希望能帮助你..

AddValueListbox2

函数检查值是否存在，如果不存在则添加它，如果存在则提醒用户。

注意 如果您为列表框启用了多项选择，则此将起作用。

---

 Private Sub CommandButton1_Click()

'index is -1 if nothin is selected
If ListBox1.ListIndex = -1 Then Exit Sub

'loop backwards as we're removing items
For i = ListBox1.ListCount - 1 To 0 Step -1

    If ListBox1.Selected(i) Then

        AddValueListbox2 ListBox1.List(i)
        ListBox1.RemoveItem (i)

    End If
Next i

End Sub


Private Function AddValueListbox2(str As String)

Dim valExists As Boolean

valExists = False

    For i = 0 To ListBox2.ListCount - 1

        If ListBox2.List(i) = str Then valExists = True

    Next i

    If valExists Then

        MsgBox str & " has already been added to ListBox", vbInformation

    Else

        ListBox2.AddItem str

    End If

End Function

Private Sub UserForm_Activate()

Dim items(2) As String

items(0) = "foo"
items(1) = "bar"
items(2) = "baz"


    For i = LBound(items) To UBound(items)
        Me.ListBox1.AddItem items(i)
    Next i

End Sub

Answer 2

如果有人仍然感兴趣，还有另一种方法可以做到这一点，使用类似的技术。

Sub Duplicate()

 dim i as integer
 dim x as integer
 x = 0

  For i = 0 to listbox2.count - 1 
     If listbox2.list(i) = myval Then
        x = x + 1
     End If
  Next i

  If x = 0 Then
     listbox2.additem myval
  End If

End Sub

其中 myval 是从 listbox1 中选择的值。

本质上，如果它在列表中找到对您的值的单个引用，它将启动一个计数器。如果没有找到您的值的实例，它将把它插入到列表框中。

希望这对某人有帮助。