c# - process.standardoutput.ReadToEnd() 总是空的？

Question

我正在启动一个控制台应用程序，但是当我重定向标准输出时，我总是什么也得不到!

当我不重定向它，并将 CreateNoWindow 设置为 false 时，我在控制台中正确地看到了所有内容，但是当我重定向它时，StandardOutput。 ReadToEnd() 始终返回一个空字符串。

        Process cproc = new Process();
        cproc.StartInfo.CreateNoWindow = true;
        cproc.StartInfo.FileName = Dest;
        cproc.StartInfo.RedirectStandardOutput = true;
        cproc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        cproc.StartInfo.UseShellExecute = false;
        cproc.EnableRaisingEvents = true;
        cproc.Start();
        cproc.Exited += new EventHandler(cproc_Exited);
        while(!stop)
        {
           result += cproc.StandardOutput.ReadToEnd();
        }

EventHandler cproc_exited 只是将stop 设置为true。有人可以解释为什么 result 总是 string.Empty 吗？

Answer 1

最好的方法是重定向输出并等待事件:

    // not sure if all this flags are needed
    process.StartInfo.CreateNoWindow = true;
    process.StartInfo.ErrorDialog = false;
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardError = true;
    process.StartInfo.RedirectStandardInput = true;
    process.StartInfo.RedirectStandardOutput = true;
    process.EnableRaisingEvents = true;
    process.OutputDataReceived += process_OutputDataReceived;
    process.ErrorDataReceived += process_ErrorDataReceived;
    process.Exited += process_Exited;
    process.Start();

    void process_Exited(object sender, System.EventArgs e)
    {
        // do something when process terminates;
    }

    void process_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        // a line is writen to the out stream. you can use it like:
        string s = e.Data;
    }

    void process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        // a line is writen to the out stream. you can use it like:
        string s = e.Data;
    }