继续循环

Question

我有以下代码

For x = LBound(arr) To UBound(arr)

    sname = arr(x)  
    If instr(sname, "Configuration item") Then  
        '**(here i want to go to next x in loop and not complete the code below)**  

    '// other code to copy past and do various stuff

Next x  

所以我认为我可以简单地使用声明 Then Next x，但这会产生“no for statement declared”错误。

那么我可以在If instr(sname, "Configuration item") Then 之后添加什么以使其进入 x 的下一个值？

Answer 1

多年后 :D 我用一个“选择”语句作为一个简单的例子：

  For Each zThisRow In zRowRange
    zRowNum = zThisRow.Row
    Select Case zRowNum
      Case 1 '- Skip header row and any other rows to skip -----
             '- no need to put anything here -----

      Case Else '- Rows to process -----
             '- Process for stuff to do something here -----
    End Select
  Next zThisRow

您可以通过将每个“if”结果转换为一个值来使其变得尽可能复杂（也许有点过于复杂的代码会有助于解释 :D）：

zSkip = 0
If 'condition1 = skip' Then zSkip = zSkip + 1
If 'condition2 = skip' Then zSkip = zSkip + 1
If 'condition3 = skip' Then zSkip = zSkip + 1
Select Case zRowNum
  Case 0 '- Stuff to do -----
  Case Else '- Stuff to skip -----
End Select

这只是一个建议；祝你圣诞快乐！

Answer 2

您可以通过简单的方式做到这一点，只需将 for 循环中使用的变量值更改为示例中所示的结束值

Sub TEST_ONLY()
    For i = 1 To 10
        ActiveSheet.Cells(i, 1).Value = i
        If i = 5 Then
            i = 10
        End If
    Next i
End Sub

Answer 3

对于不使用“DO”的情况：这是我对带有嵌套 If 条件语句的 FOR EACH 的解决方案：

For Each line In lines
    If <1st condition> Then
        <code if 1st condition>
        If <2nd condition> Then
            If <3rd condition> Then
                GoTo ContinueForEach
            Else
                <code else 3rd condition>
            End If
        Else
            <code else 2nd condition>
        End If
    Else
        <code else 1st condition>
    End If
ContinueForEach:
Next

Answer 4

这也可以使用布尔值来解决。

For Each rngCol In rngAll.Columns
    doCol = False '<==== Resets to False at top of each column
    For Each cell In Selection
        If cell.row = 1 Then
            If thisColumnShouldBeProcessed Then doCol = True
        End If
        If doCol Then
            'Do what you want to do to each cell in this column
        End If
    Next cell
Next rngCol

例如，以下是完整的示例：
(1) 识别工作表上已使用单元格的范围
(2) 循环遍历每一列
(3) IF 列标题是可接受的标题，循环遍历列中的所有单元格

Sub HowToSkipForLoopIfConditionNotMet()
    Dim rngCol, rngAll, cell As Range, cnt As Long, doCol, cellValType As Boolean
    Set rngAll = Range("A1").CurrentRegion
    'MsgBox R.Address(0, 0), , "All data"
    cnt = 0
    For Each rngCol In rngAll.Columns
        rngCol.Select
        doCol = False
        For Each cell In Selection
            If cell.row = 1 Then
                If cell.Value = "AnAllowedColumnTitle" Then doCol = True
            End If
            If doCol Then '<============== THIS LINE ==========
                cnt = cnt + 1
                Debug.Print ("[" & cell.Value & "]" & " / " & cell.Address & " / " & cell.Column & " / " & cell.row)
                If cnt > 5 Then End '<=== NOT NEEDED. Just prevents too much demo output.
            End If
        Next cell
    Next rngCol
End Sub

注意：如果您没有立即捕捉到它，If docol Then 行是您倒置的 CONTINUE。也就是说，如果 doCol 仍然为 False，则脚本继续到下一个单元格并且不执行任何操作。

当然不如正确的 continue 或 next for 语句那么快/高效，但最终结果与我所能得到的一样接近。

Answer 5

您正在考虑像Java's 或Python's 这样的continue 语句，但是VBA 没有这样的本机语句，并且您不能像那样使用VBA 的Next。

您可以使用GoTo 语句代替您尝试做的事情，但实际上，GoTo 应该保留用于替代方案是人为且不切实际的情况。

在您使用单个“继续”条件的情况下，有一个非常简单、干净且可读的替代方案：

    If Not InStr(sname, "Configuration item") Then
        '// other code to copy paste and do various stuff
    End If

Answer 6

您可以使用GoTo：

Do

    '... do stuff your loop will be doing

    ' skip to the end of the loop if necessary:
    If <condition-to-go-to-next-iteration> Then GoTo ContinueLoop 

    '... do other stuff if the condition is not met

ContinueLoop:
Loop

Answer 7

很多年后...我喜欢这个：

For x = LBound(arr) To UBound(arr): Do

    sname = arr(x)  
    If instr(sname, "Configuration item") Then Exit Do 

    '// other code to copy past and do various stuff

Loop While False: Next x

Answer 8

我有时会做一个双重循环：

Do

    Do

        If I_Don't_Want_to_Finish_This_Loop Then Exit Do

        Exit Do

    Loop

Loop Until Done

这避免了“goto spaghetti”

Answer 9

For i=1 To 10
    Do 
        'Do everything in here and

        If I_Dont_Want_Finish_This_Loop Then
            Exit Do
        End If 

        'Of course, if I do want to finish it,
        'I put more stuff here, and then...

    Loop While False 'quit after one loop
Next i

Answer 10

晚了几年，但这里有另一种选择。

For x = LBound(arr) To UBound(arr)
    sname = arr(x)  
    If InStr(sname, "Configuration item") Then  
        'Do nothing here, which automatically go to the next iteration
    Else
        'Code to perform the required action
    End If
Next x