我们也有这个问题(或一个变体)。

试试下面的方法:

1)为p.WaitForExit(nnnn)添加超时;其中NNNN以毫秒为单位。

2)将ReadToEnd调用放在WaitForExit调用之前。这是我们看到MS推荐的。

我读了很多答案，并给出了自己的答案。不确定这个在任何情况下都会修复，但它在我的环境中修复了。我没有使用WaitForExit，而是使用WaitHandle。在输出和错误端信号上等待所有。如果有人能发现可能存在的问题，我会很高兴。或者它是否能帮助别人。对我来说更好，因为不用暂停。

private static int DoProcess(string workingDir, string fileName, string arguments)
{
    int exitCode;
    using (var process = new Process
    {
        StartInfo =
        {
            WorkingDirectory = workingDir,
            WindowStyle = ProcessWindowStyle.Hidden,
            CreateNoWindow = true,
            UseShellExecute = false,
            FileName = fileName,
            Arguments = arguments,
            RedirectStandardError = true,
            RedirectStandardOutput = true
        },
        EnableRaisingEvents = true
    })
    {
        using (var outputWaitHandle = new AutoResetEvent(false))
        using (var errorWaitHandle = new AutoResetEvent(false))
        {
            process.OutputDataReceived += (sender, args) =>
            {
                // ReSharper disable once AccessToDisposedClosure
                if (args.Data != null) Debug.Log(args.Data);
                else outputWaitHandle.Set();
            };
            process.ErrorDataReceived += (sender, args) =>
            {
                // ReSharper disable once AccessToDisposedClosure
                if (args.Data != null) Debug.LogError(args.Data);
                else errorWaitHandle.Set();
            };

            process.Start();
            process.BeginOutputReadLine();
            process.BeginErrorReadLine();

            WaitHandle.WaitAll(new WaitHandle[] { outputWaitHandle, errorWaitHandle });

            exitCode = process.ExitCode;
        }
    }
    return exitCode;
}

在我的情况下，我有一个错误，所以我只是徒劳地等待一个正常的输出。

我改变了顺序:

string result = process.StandardOutput.ReadToEnd();
string error = process.StandardError.ReadToEnd();

:

string error = process.StandardError.ReadToEnd();

if (string.IsNullOrEmpty(error))
    string result = process.StandardOutput.ReadToEnd();

在阅读了这里所有的帖子之后，我确定了Marko avlijaovic的统一解决方案。 然而，它并没有解决我所有的问题。

在我们的环境中，我们有一个Windows服务，计划运行数百个不同的.bat .cmd .exe，…等等，这些文件积累了多年，由许多不同的人以不同的风格编写。我们无法控制程序和脚本的编写，我们只负责调度、运行和成功/失败的报告。

所以我尝试了这里所有的建议，并取得了不同程度的成功。Marko的回答几乎是完美的，但是当作为服务运行时，它并不总是捕获标准输出。我一直没搞清楚为什么不行。

我们发现在所有情况下都有效的唯一解决方案是:http://csharptest.net/319/using-the-processrunner-class/index.html

我试图通过考虑Mark Byers, Rob, stevejay的回答，创建一个类来解决你使用异步流读取的问题。这样做，我意识到有一个与异步流程输出流读取相关的错误。

我在微软报告了这个漏洞:https://connect.microsoft.com/VisualStudio/feedback/details/3119134

简介:

You can't do that: process.BeginOutputReadLine(); process.Start(); You will receive System.InvalidOperationException : StandardOut has not been redirected or the process hasn't started yet. ============================================================================================================================ Then you have to start asynchronous output read after the process is started: process.Start(); process.BeginOutputReadLine(); Doing so, make a race condition because the output stream can receive data before you set it to asynchronous:

process.Start(); 
// Here the operating system could give the cpu to another thread.  
// For example, the newly created thread (Process) and it could start writing to the output
// immediately before next line would execute. 
// That create a race condition.
process.BeginOutputReadLine();

============================================================================================================================ Then some people could say that you just have to read the stream before you set it to asynchronous. But the same problem occurs. There will be a race condition between the synchronous read and set the stream into asynchronous mode. ============================================================================================================================ There is no way to acheive safe asynchronous read of an output stream of a process in the actual way "Process" and "ProcessStartInfo" has been designed.

对于您的情况，您最好使用其他用户建议的异步读取。但是您应该意识到，由于竞态条件，您可能会错过一些信息。

流程的文档。StandardOutput说在你等待之前读取，否则你会死锁，代码片段复制如下:

 // Start the child process.
 Process p = new Process();
 // Redirect the output stream of the child process.
 p.StartInfo.UseShellExecute = false;
 p.StartInfo.RedirectStandardOutput = true;
 p.StartInfo.FileName = "Write500Lines.exe";
 p.Start();
 // Do not wait for the child process to exit before
 // reading to the end of its redirected stream.
 // p.WaitForExit();
 // Read the output stream first and then wait.
 string output = p.StandardOutput.ReadToEnd();
 p.WaitForExit();