如何在 Excel 中記住或保存更改單元格的先前值？

通常，在使用新內容更新單元格時，除非您在 Excel 中撤銷該操作，否則先前的值將被覆蓋。然而，如果您希望保留先前的值以便與更新後的值進行比較，將先前的單元格值保存到另一個單元格或單元格批註中將是一個不錯的選擇。本文中的方法將幫助您實現這一目標。

使用 VBA 程式碼在 Excel 中保存先前的單元格值

使用 VBA 程式碼在 Excel 中保存先前的單元格值

假設您有一個如下截圖所示的表格。如果 C 列中的任何單元格發生變化，您可能希望將其先前的值自動保存到 G 列的相應單元格中或作為批註。請按照以下步驟操作以實現此目的。

1. 在包含要保存值的工作表中，右鍵單擊工作表標籤，然後從右鍵菜單中選擇「檢視程式碼」。請參見截圖：

2. 在打開的「Microsoft Visual Basic for Applications」窗口中，將以下 VBA 程式碼複製到程式碼窗口中。

以下 VBA 程式碼可幫助您將指定列的先前單元格值保存到另一列中。

VBA 程式碼：將先前單元格值保存到另一列單元格中

Dim xRg As Range
Dim xChangeRg As Range
Dim xDependRg As Range
Dim xDic As New Dictionary
Private Sub Worksheet_Change(ByVal Target As Range)
    Dim I As Long
    Dim xCell As Range
    Dim xDCell As Range
    Dim xHeader As String
    Dim xCommText As String
    On Error Resume Next
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    xHeader = "Previous value :"
    x = xDic.Keys
    For I = 0 To UBound(xDic.Keys)
        Set xCell = Range(xDic.Keys(I))
        Set xDCell = Cells(xCell.Row, 7)
        xDCell.Value = ""
        xDCell.Value = xDic.Items(I)
    Next
    Application.EnableEvents = True
    Application.ScreenUpdating = True
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    Dim I, J As Long
    Dim xRgArea As Range
    On Error GoTo Label1
    If Target.Count > 1 Then Exit Sub
    Application.EnableEvents = False
    Set xDependRg = Target.Dependents
    If xDependRg Is Nothing Then GoTo Label1
    If Not xDependRg Is Nothing Then
        Set xDependRg = Intersect(xDependRg, Range("C:C"))
    End If
Label1:
    Set xRg = Intersect(Target, Range("C:C"))
    If (Not xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = Union(xRg, xDependRg)
    ElseIf (xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = xDependRg
    ElseIf (Not xRg Is Nothing) And (xDependRg Is Nothing) Then
        Set xChangeRg = xRg
    Else
        Application.EnableEvents = True
        Exit Sub
    End If
    xDic.RemoveAll
    For I = 1 To xChangeRg.Areas.Count
        Set xRgArea = xChangeRg.Areas(I)
        For J = 1 To xRgArea.Count
            xDic.Add xRgArea(J).Address, xRgArea(J).Formula
        Next
    Next
    Set xChangeRg = Nothing
    Set xRg = Nothing
    Set xDependRg = Nothing
    Application.EnableEvents = True
End Sub

若要將先前的單元格值保存在批註中，請應用以下 VBA 程式碼

VBA 程式碼：將先前單元格值保存在批註中

Dim xRg As Range
Dim xChangeRg As Range
Dim xDependRg As Range
Dim xDic As New Dictionary
Private Sub Worksheet_Change(ByVal Target As Range)
    Dim I As Long
    Dim xCell As Range
    Dim xHeader As String
    Dim xCommText As String
    On Error Resume Next
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    xHeader = "Previous value :"
    For I = 0 To UBound(xDic.Keys)
        Set xCell = Range(xDic.Keys(I))
        If Not xCell.Comment Is Nothing Then xCell.Comment.Delete
        With xCell
            .AddComment
            .Comment.Visible = False
            .Comment.Text xHeader & vbCrLf & xDic.Items(I)
        End With
    Next
    Application.EnableEvents = True
    Application.ScreenUpdating = True
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    Dim I, J As Long
    Dim xRgArea As Range
    On Error GoTo Label1
    If Target.Count > 1 Then Exit Sub
    Application.EnableEvents = False
    Set xDependRg = Target.Dependents
    If xDependRg Is Nothing Then GoTo Label1
    If Not xDependRg Is Nothing Then
        Set xDependRg = Intersect(xDependRg, Range("C:C"))
    End If
Label1:
    Set xRg = Intersect(Target, Range("C:C"))
    If (Not xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = Union(xRg, xDependRg)
    ElseIf (xRg Is Nothing) And (Not xDependRg Is Nothing) Then
        Set xChangeRg = xDependRg
    ElseIf (Not xRg Is Nothing) And (xDependRg Is Nothing) Then
        Set xChangeRg = xRg
    Else
        Application.EnableEvents = True
        Exit Sub
    End If
    xDic.RemoveAll
    For I = 1 To xChangeRg.Areas.Count
        Set xRgArea = xChangeRg.Areas(I)
        For J = 1 To xRgArea.Count
            xDic.Add xRgArea(J).Address, xRgArea(J).Text
        Next
    Next
    Set xChangeRg = Nothing
    Set xRg = Nothing
    Set xDependRg = Nothing
    Application.EnableEvents = True
End Sub

注意：在程式碼中，數字 7 表示您將保存先前單元格值的 G 列，而 C:C 是您將進行更改的列。請根據需要進行更改。

3. 點擊「工具」>「引用」以打開「引用 – VBAProject」對話框，勾選「Microsoft Scripting Runtime」框，最後點擊「確定」按鈕。請參見截圖：

4. 按下「Alt」+「Q」鍵關閉「Microsoft Visual Basic for Applications」窗口。

從現在開始，當 C 列中的單元格值更新時，先前的值將保存在 G 列的相應單元格中或作為批註，如下方截圖所示。

將先前的單元格值保存在其他單元格中：

將先前的單元格值保存在批註中：