如何使用 for 循环检查单元格中的相等值？答案

【问题标题】：How to check for equal values in cells with a for loop?如何使用 for 循环检查单元格中的相等值？
【发布时间】：2020-02-19 11:14:45
【问题描述】：

我想用 for 循环检查单元格中的文本值是否与下面单元格中的相同。

如果 Cell(1) 和 Cell(2) 中的值不匹配，我希望将 Cell(3) 中的值写入 Cell(4)。

我收到一个错误

“溢出（错误 6）”

Dim i As Integer

For i = 1 To Rows.Count

    If Cells(2 + i,21) = Cells(3 + i,21) Then
        i = i + 1
    Else
        a = Cells(3 + i, 1)
        j = j + 1
        Cells(228 + j, 3) = a
    End If

Next i

End Sub

我有一个生产输出和一个从早上 6 点到 12 点的时间表，我想创建一个时间表，如下所示。

截图：

【问题讨论】：

您的a 变量未声明：Dim a as Range，也未设置：Set a = Cells(3+i,1)。还将i 声明为Long，而不是Integer
首先，将For i = 1 to Rows.Count 替换为more reliable lastrow statement。
不要使用Integer变量（很容易导致溢出），改用Long。根据@Plution，还请使用更可靠的方法来检索最后一行。此外，我建议至少使用工作表引用并循环遍历数组（通过内存）而不是单元格。话虽如此。请您提供一些模型示例数据和预期结果吗？
@Teamothy，我不认为a 变量是一个范围对象。相反，我认为 OP 正在尝试写 Cells(228 + j, 3) = Cells(3 + i, 1)
@JvdV 是的，我的错，他想要一个值而不是范围，采用你的方法会更容易。

标签： excel vba for-loop comparison

【解决方案1】：

你可以使用

Option Explicit

Sub test()

    Dim LastRowA As Long, i As Long, j As Long, LastRowW As Long
    Dim StartTime As Date, EndTime As Date, strOutPut

    j = 0

    With ThisWorkbook.Worksheets("Sheet1")

        LastRowA = .Cells(.Rows.Count, "A").End(xlUp).Row

        For i = 3 To LastRowA

            If i > j - 1 Then

                StartTime = .Range("A" & i).Value
                strOutPut = .Range("U" & i).Value

                For j = i + 1 To LastRowA + 1

                    If strOutPut <> .Range("U" & j).Value Then

                        EndTime = .Range("A" & j - 1).Value
                        LastRow = .Cells(.Rows.Count, "W").End(xlUp).Row

                        .Range("W" & LastRow + 1).Value = StartTime
                        .Range("X" & LastRow + 1).Value = EndTime
                        .Range("Y" & LastRow + 1).Value = strOutPut

                        Exit For

                    End If

                Next j

            End If

        Next i

    End With

End Sub

结果

【讨论】：

【解决方案2】：

这里我使用了一个字典，它将存储每个产品逗号分隔的每次时间，因此稍后将对其进行拆分并取第一次和最后一次出现：

Sub TimeTable()

        'Declare an array variable to store the data
        'change MySheet for your sheet name
        arr = ThisWorkbook.Sheets("MySheet").UsedRange.Value 'this will store the whole worksheet, the used area.

        'Declare a dictionary object
        Dim Products As Object: Set Products = CreateObject("Scripting.Dictionary")

        'Loop through the array
        Dim i As Long
        For i = 3 To UBound(arr) 'start from row 3 because of your screenshoot
            If arr(i, 21) = vbNullString Then GoTo NextRow 'if column U is empty won't add anything
            If Not Products.Exists(arr(i, 21)) Then '21 is the column index for column U
                Products.Add arr(i, 21), arr(i, 1)
            Else
                Products(arr(i, 21)) = arr(i, 21) & "," & arr(i, 1)
            End If
NextRow:
        Next i
        Erase arr

        'Redim the array to fit your final data, 4 columns and as many rows as products
        ReDim arr(1 To Products.Count + 1, 1 To 4)

        'Insert the headers
        arr(1, 1) = "Time"
        arr(1, 4) = "Product / Error"

        'Now loop through the dictionary
        Dim Key As Variant, MySplit As Variant
        i = 2
        For Each Key In Products.Keys
            MySplit = Split(Products(Key), ",")
            arr(i, 1) = MySplit(LBound(MySplit))
            arr(i, 2) = "-"
            arr(i, 3) = MySplit(UBound(MySplit))
            arr(i, 4) = Key
            i = i + 1
        Next Key


        'I don't know where are you going to paste your data, so I'm making a new worksheet at the end of your workbook
        Dim ws As Worksheet
        Set ws = ThisWorkbook.Sheets.Add(After:=ThisWorkbook.Sheets(ThisWorkbook.Sheets.Count))
        With ws
            .Range("A1").Resize(UBound(arr), UBound(arr, 2)).Value = arr
            .Range("A1:C1").Merge
        End With

End Sub

【讨论】：