Question

我的代码中有一个Try Catch。我想知道是否有一个只在没有发现错误时执行的语句？最后执行有或没有错误，但我不希望...

我有这个

Try
            My.Computer.FileSystem.DeleteDirectory(txtFolder.Text, FileIO.DeleteDirectoryOption.DeleteAllContents)
        Catch ex As Exception
            Status(ex.Message)
        End Try
        Status("Resetted", , 2000)

我希望最后一个状态语句只显示是否没有错误

Answer 1

我觉得这样简单就足够了：

Try 
   My.Computer.FileSystem.DeleteDirectory(txtFolder.Text, FileIO.DeleteDirectoryOption.DeleteAllContents) 
   Status("Resetted", , 2000) 'will only have reached here if there were NO exceptions
Catch ex As Exception 
   Status(ex.Message) 
End Try

Answer 2

真的，你不需要特别声明

Try

' Code to watch for exceptions

Catch Ex as Exception

' Code to handle exception and eventually, if it is not possible
' to continue, exit from this method. There are two possibilities: 
' Return <some meaningful value to the caller if this is a function> 
' Throw -->>  **without any argument** and let the caller handle the exception
End Try

' Code here will be executed only if the first try block doesn't throw exceptions

常见的错误是使用 Throw Ex 而不是投掷。差异很微妙但非常重要。如果使用 Throw Ex ，则会覆盖堆栈跟踪，因此很难找到失败代码的原始行。

尝试Catch no error statement

2 个答案: