如何在.NET中生成进程并捕获其STDOUT？

Question

如何在.NET中生成进程并捕获其STDOUT？我需要生成一个作为控制台应用程序的子进程，并捕获它的输出。我为一个方法编写了以下代码：string retMessage = String.Empty;ProcessStartInfo startInfo = new ProcessStartInfo();Process p = new Process(); startInfo.CreateNoWindow = true;startInfo.RedirectStandardOutput = true;startInfo.RedirectStandardInput = true; startInfo.UseShellExecute = false;startInfo.Arguments = command;startInfo.FileName = exec;p.StartInfo = startInfo ;p.Start();p.OutputDataReceived += new DataReceivedEventHandler(     delegate(object sender, DataReceivedEventArgs e)     {         using (StreamReader output = p.StandardOutput)         {             retMessage = output.ReadToEnd();         }     });p.WaitForExit();return retMessage;然而，这不会返回任何东西。我不相信OutputDataReceived事件正在被回调，或者WaitForExit()命令可能阻塞线程，因此它将永远不会回调。有什么建议吗？编辑：看来我对回调太费劲了。做：return p.StandardOutput.ReadToEnd();似乎运转良好。

Answer 1

这是我验证过的代码。我使用它来生成MSBuild并监听它的输出：

process.StartInfo.UseShellExecute = false;

process.StartInfo.RedirectStandardOutput = true;

process.OutputDataReceived += (sender, args) => Console.WriteLine("received output: {0}", args.Data);

process.Start();

process.BeginOutputReadLine();

Answer 2

我需要捕获stdout和stderr，如果进程没有在预期的情况下退出，则需要超时。我想出了这个：

Process process = new Process();

StringBuilder outputStringBuilder = new StringBuilder();

try

{

process.StartInfo.FileName = exeFileName;

process.StartInfo.WorkingDirectory = args.ExeDirectory;

process.StartInfo.Arguments = args;

process.StartInfo.RedirectStandardError = true;

process.StartInfo.RedirectStandardOutput = true;

process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

process.StartInfo.CreateNoWindow = true;

process.StartInfo.UseShellExecute = false;

process.EnableRaisingEvents = false;

process.OutputDataReceived += (sender, eventArgs) => outputStringBuilder.AppendLine(eventArgs.Data);

process.ErrorDataReceived += (sender, eventArgs) => outputStringBuilder.AppendLine(eventArgs.Data);

process.Start();

process.BeginOutputReadLine();

process.BeginErrorReadLine();

var processExited = process.WaitForExit(PROCESS_TIMEOUT);

if (processExited == false) // we timed out...

{

    process.Kill();

    throw new Exception("ERROR: Process took too long to finish");

}

else if (process.ExitCode != 0)

{

    var output = outputStringBuilder.ToString();

    var prefixMessage = "";

    throw new Exception("Process exited with non-zero exit code of: " + process.ExitCode + Environment.NewLine + 

    "Output from process: " + outputStringBuilder.ToString());

}

}

finally

{                

process.Close();

}

我正在将stdout和stderr连接到相同的字符串中，但是如果需要的话，您可以将它分开。它使用事件，所以它应该处理它们的到来(我相信)。我已经成功地运行了这个程序，并将很快进行卷测试。