编辑:我找到了原因,因为函数语句包含在 try/catch 子句中,函数无法到达无法到达退出代码将被记录的语句。
我现在也在 catch 子句中登录。
如果我发现新的东西,我会告诉你。
我正在 VB.NET 中创建一个 UI 应用程序,它创建进程来运行一些命令行应用程序并获取它们返回的字符串。
所有这些调用都是在 BackgroundWorker 线程中进行的。
问题是我的应用程序不可靠。
有时它工作正常,有时函数没有到达返回语句。
我看到这一点是因为我在函数返回之前将信息记录在文本文件中。
有什么我没有做的吗?这是我第一次使用后台工作者。
如果您需要更多信息,我很乐意为您提供。
编辑:我不在 UI 中使用的 ExecuteCommand 函数返回的信息,我用它创建了一个 Excel 文件。编辑:我调用的函数
Public Function ExecuteCommand(ByVal Command As String) As String
Dim bw As BackgroundWorker = MainForm.BackgroundWorker1
RuntimeHelpers.PrepareConstrainedRegions()
Try
Dim result As String = String.Empty
Dim startTime As Date
Dim endTime As Date
Dim procStartInfo As New System.Diagnostics.ProcessStartInfo("cmd", "/c " & Command)
objLog.LogAction("[" & Format(Now, "HH:mm:ss") & "]" & " " & Command.ToString)
startTime = Now
' The following commands are needed to redirect the standard output.
' This means that it will be redirected to the Process.StandardOutput StreamReader.
procStartInfo.RedirectStandardOutput = True
procStartInfo.RedirectStandardError = True
procStartInfo.UseShellExecute = False
' Do not create the black window.
procStartInfo.CreateNoWindow = True
' Now we create a process, assign its ProcessStartInfo and start it
Dim proc As New System.Diagnostics.Process()
AddHandler proc.OutputDataReceived, AddressOf StdOutputDataHandler
sStdOutput = New StringBuilder()
proc.StartInfo = procStartInfo
proc.Start()
proc.BeginOutputReadLine()
Dim exitCode As Integer
proc.WaitForExit()
exitCode = proc.ExitCode
Dim rsStdOut As String = String.Empty
If sStdOutput.Length > 0 Then
rsStdOut = sStdOutput.ToString
End If
proc.Close()
proc = Nothing
endTime = Now
Dim elapsed As String
elapsed = (endTime - startTime).TotalSeconds.ToString
elapsed = elapsed.Substring(0, elapsed.IndexOf(".") + 4)
objLog.LogAction("[" & Format(Now, "HH:mm:ss") & "]" & " exit code: " & exitCode.ToString() + vbCrLf + vbTab + "Command execution took " + elapsed + " seconds" + vbCrLf)
If exitCode <> 0 Then
result = ERROR_MESSAGE
Else
result = rsStdOut
End If
result = result.Trim()
If result.Length > 1 Then
'result = result.Substring(0, result.Length - 1)
End If
'result = Regex.Replace(result, "\n", RESULT_SPLITER)
Return result
Catch ex As Exception
Return ERROR_MESSAGE
End Try
End Function
和日志文件摘录:
[13:44:05] si viewproject -P project -Y --projectRevision 1.4
[13:44:05] si viewproject -P project -Y --projectRevision 1.5
[13:44:05] si viewproject -P project -Y --projectRevision 1.6
[13:44:06] exit code: 0
Command execution took 0.079 seconds
[13:44:06] si viewproject -P project -Y --projectRevision 1.7
[13:44:06] exit code: 0
Command execution took 0.082 seconds
在代表命令的每一行之后应该有一个退出代码