实时获取命令行输出不适用于所有CLI

Question

The below code is working fine for ping stackoverflow.com and most other cases but when I using 7z.exe it's not real time, it waits until directory is compressed and then shows the output. The argument that I used for compress is a test.7z dirpath . Can I do anything else?

    private ProcessStartInfo GetProcessStartInfo(string filename, string arguments)
    {
        ProcessStartInfo ProcessStartInfo = new ProcessStartInfo();
        ProcessStartInfo.CreateNoWindow = true;
        ProcessStartInfo.UseShellExecute = false;
        ProcessStartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        ProcessStartInfo.RedirectStandardOutput = true;
        ProcessStartInfo.RedirectStandardError = true;
        ProcessStartInfo.RedirectStandardInput = true;
        ProcessStartInfo.FileName = filename;
        ProcessStartInfo.Arguments = arguments;
    }

    private void ProcessRun(string filename, string arguments)
    {
        Process Process = new Process();
        Process.StartInfo = GetProcessStartInfo(filename, arguments);
        Process.ErrorDataReceived += Process_OutputDataReceived;
        Process.OutputDataReceived += Process_OutputDataReceived;
        Process.EnableRaisingEvents = true;
        Process.Start();
        Process.BeginOutputReadLine();
        Process.BeginErrorReadLine();

        Process.WaitForExit();
    }

    public ObservableList<string> Output = new ObservableList<string>();

    private void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        Output.Add(e.Data);
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        OutputListBox.ItemsSource = Output;
        ProcessRun("cmd.exe", "/c ping stackoverflow.com");
    }

7zip Output:

7zip Progress:

Answer 1

If you're interested in the percentage, you're out of luck - that isn't done by standard output. Standard output only handles streams of data, while the percentage output is actually done by manipulating the console directly. It's not part of the output stream - there is no way to replicate the same effect using the standard I/O streams.

So it's not a problem of your code. If you want to see the same problem using just the Command prompt, try running this:

7z.exe yourarguments > log.txt

The > is an output redirect - instead of writing to the console, the standard output is redirected to a file. When you use it with ping , it immediately prints out standard output as it comes. When you use it with 7zip, you get the same result as with your C# application.