Process.Start（）导致应用程序挂起

Question

I'm having a hard time with Process.Start()
Here is the code:

static void Main(string[] args)
{
    string fileName = @"C:\path_to_project\bin\Debug\helloworld.exe";

    ProcessStartInfo info = new ProcessStartInfo(fileName);
    info.UseShellExecute = false;
    info.RedirectStandardInput = true;
    info.RedirectStandardOutput = true;
    info.RedirectStandardError = true;
    info.CreateNoWindow = true;

    Process process = Process.Start(info);
    string error = process.StandardError.ReadToEnd();
    string returnvalue = process.StandardOutput.ReadToEnd();

    process.WaitForExit();
    Console.ReadLine();
}

The code should only call helloworld console application which has only one line Console.WriteLine("Hello World") , nothing special.

When I debug this code I reach the Process process = Process.Start(info); Then when I hit Step over (F10) nothing happens. My application hangs and the process I started is there but it is not finishing. I need to kill'em all.

This code works on my colleague's machine but on my machine the process just hangs and only thing I can do is kill the process.

I also noticed that when I double click any console application in explorer the cursor changes the state to busy and never changes back until I kill explorer.exe.

Could it be some security issue or malware?

Answer 1

Avast Antivirus intercepts Process.Start(), probably it tries to sandbox the application i'm trying to start so it hangs.

I disabled shield temporary and it now works.

Thank you all for the effort.

Answer 2

So actually your code looks fine. And it does work for me with a simple "Hello World!" console application.

However, I remember that we had a problem like this some time ago, with a hanging process.WaitForExit() on a process we tried to get the output from.

Unfortunatly I can't remember if it was exactly the same problem as you encounter here. But I suggest to try another possibility for what you are trying to achieve:

static void Main(string[] args)
{
    string fileName = @"C:\path_to_project\bin\Debug\helloworld.exe";

    ProcessStartInfo info = new ProcessStartInfo(fileName);
    info.UseShellExecute = false;
    info.RedirectStandardInput = true;
    info.RedirectStandardOutput = true;
    info.RedirectStandardError = true;
    info.CreateNoWindow = true;

    StringBuilder outputBuilder = new StringBuilder();
    StringBuilder errorBuilder = new StringBuilder();

    Process process = new Process {StartInfo = info};
    process.OutputDataReceived += (sender, e) => outputBuilder.Append(e.Data);
    process.ErrorDataReceived += (sender, e) => errorBuilder.Append(e.Data);

    process.Start();
    process.BeginErrorReadLine(); // do this after process.Start()
    process.BeginOutputReadLine();

    process.WaitForExit();

    string error = errorBuilder.ToString();
    string returnvalue = outputBuilder.ToString();

    Console.WriteLine("Returned: {0}", returnvalue);
    Console.WriteLine("Error: {0}", error);
    Console.ReadLine();
}

I'm sorry that I cannot explain why your code is hanging (and as I said it's working for me). But maybe this variation will work.