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。

我最终使用的解决方案来避免所有的复杂性:

var outputFile = Path.GetTempFileName();
info = new System.Diagnostics.ProcessStartInfo("TheProgram.exe", String.Join(" ", args) + " > " + outputFile + " 2>&1");
info.CreateNoWindow = true;
info.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
info.UseShellExecute = false;
System.Diagnostics.Process p = System.Diagnostics.Process.Start(info);
p.WaitForExit();
Console.WriteLine(File.ReadAllText(outputFile)); //need the StandardOutput contents

所以我创建了一个临时文件，通过使用> outputfile > 2>&1将输出和错误重定向到它，然后在进程完成后读取文件。

其他解决方案适用于希望对输出执行其他操作的场景，但对于简单的操作，这可以避免很多复杂性。

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();

我认为这是一个简单和更好的方法(我们不需要AutoResetEvent):

public static string GGSCIShell(string Path, string Command)
{
    using (Process process = new Process())
    {
        process.StartInfo.WorkingDirectory = Path;
        process.StartInfo.FileName = Path + @"\ggsci.exe";
        process.StartInfo.CreateNoWindow = true;
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.RedirectStandardInput = true;
        process.StartInfo.UseShellExecute = false;

        StringBuilder output = new StringBuilder();
        process.OutputDataReceived += (sender, e) =>
        {
            if (e.Data != null)
            {
                output.AppendLine(e.Data);
            }
        };

        process.Start();
        process.StandardInput.WriteLine(Command);
        process.BeginOutputReadLine();


        int timeoutParts = 10;
        int timeoutPart = (int)TIMEOUT / timeoutParts;
        do
        {
            Thread.Sleep(500);//sometimes halv scond is enough to empty output buff (therefore "exit" will be accepted without "timeoutPart" waiting)
            process.StandardInput.WriteLine("exit");
            timeoutParts--;
        }
        while (!process.WaitForExit(timeoutPart) && timeoutParts > 0);

        if (timeoutParts <= 0)
        {
            output.AppendLine("------ GGSCIShell TIMEOUT: " + TIMEOUT + "ms ------");
        }

        string result = output.ToString();
        return result;
    }
}

上面的答案没有一个能起作用。

Rob解决方案挂起，“Mark Byers”解决方案获得已处理异常。(我尝试了其他答案的“解决方案”)。

所以我决定提出另一个解决方案:

public void GetProcessOutputWithTimeout(Process process, int timeoutSec, CancellationToken token, out string output, out int exitCode)
{
    string outputLocal = "";  int localExitCode = -1;
    var task = System.Threading.Tasks.Task.Factory.StartNew(() =>
    {
        outputLocal = process.StandardOutput.ReadToEnd();
        process.WaitForExit();
        localExitCode = process.ExitCode;
    }, token);

    if (task.Wait(timeoutSec, token))
    {
        output = outputLocal;
        exitCode = localExitCode;
    }
    else
    {
        exitCode = -1;
        output = "";
    }
}

using (var process = new Process())
{
    process.StartInfo = ...;
    process.Start();
    string outputUnicode; int exitCode;
    GetProcessOutputWithTimeout(process, PROCESS_TIMEOUT, out outputUnicode, out exitCode);
}

这段代码经过调试，工作完美。