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vba - VBA 错误处理有哪些好的模式?

转载 作者:行者123 更新时间:2023-12-03 05:23:20 25 4
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VBA 中有哪些好的错误处理模式?

特别是,在这种情况下我应该做什么:

... some code ...
... some code where an error might occur ...
... some code ...
... some other code where a different error might occur ...
... some other code ...
... some code that must always be run (like a finally block) ...

我想处理这两个错误,并在可能发生错误的代码之后恢复执行。另外,最后的finally 代码必须始终运行——无论之前抛出了什么异常。我怎样才能达到这个结果?

最佳答案

VBA 中的错误处理

  • 出错时转到 ErrorHandlerLabel
  • 继续(下一步 | ErrorHandlerLabel)
  • On Error Goto 0(禁用当前错误处理程序)
  • Err 对象

Err 对象的属性通常在错误处理例程中重置为零或零长度字符串,但也可以使用 Err.Clear 显式完成.

错误处理例程中的错误正在终止。

范围 513-65535 可用于用户错误。对于自定义类错误,您可以将 vbObjectError 添加到错误号中。请参阅有关 Err.Raise 的 Microsoft 文档和 list of error numbers .

对于派生类中未实现的接口(interface)成员,您应该使用常量E_NOTIMPL = &H80004001

<小时/>
Option Explicit

Sub HandleError()
Dim a As Integer
On Error GoTo errMyErrorHandler
a = 7 / 0
On Error GoTo 0

Debug.Print "This line won't be executed."

DoCleanUp:
a = 0
Exit Sub
errMyErrorHandler:
MsgBox Err.Description, _
vbExclamation + vbOKCancel, _
"Error: " & CStr(Err.Number)
Resume DoCleanUp
End Sub

Sub RaiseAndHandleError()
On Error GoTo errMyErrorHandler
' The range 513-65535 is available for user errors.
' For class errors, you add vbObjectError to the error number.
Err.Raise vbObjectError + 513, "Module1::Test()", "My custom error."
On Error GoTo 0

Debug.Print "This line will be executed."

Exit Sub
errMyErrorHandler:
MsgBox Err.Description, _
vbExclamation + vbOKCancel, _
"Error: " & CStr(Err.Number)
Err.Clear
Resume Next
End Sub

Sub FailInErrorHandler()
Dim a As Integer
On Error GoTo errMyErrorHandler
a = 7 / 0
On Error GoTo 0

Debug.Print "This line won't be executed."

DoCleanUp:
a = 0
Exit Sub
errMyErrorHandler:
a = 7 / 0 ' <== Terminating error!
MsgBox Err.Description, _
vbExclamation + vbOKCancel, _
"Error: " & CStr(Err.Number)
Resume DoCleanUp
End Sub

Sub DontDoThis()

' Any error will go unnoticed!
On Error Resume Next
' Some complex code that fails here.
End Sub

Sub DoThisIfYouMust()

On Error Resume Next
' Some code that can fail but you don't care.
On Error GoTo 0

' More code here
End Sub

关于vba - VBA 错误处理有哪些好的模式?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1038006/

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