c# – 如何以线程安全的方式将控制台程序的输出重定向到文本框？

概述我无法将控制台输出重定向到 Windows窗体文本框.问题与线程有关.我正在以下列方式运行控制台应用程序, private void RunConsoleApp(){ Process proc = new Process(); proc.StartInfo.FileName = "app.exe"; proc.StartInfo.Arguments = "-a -b -c 我无法将控制台输出重定向到 Windows窗体文本框.问题与线程有关.我正在以下列方式运行控制台应用程序,

private voID runconsoleApp(){    Process proc = new Process();    proc.StartInfo.filename = "app.exe";    proc.StartInfo.Arguments = "-a -b -c";    proc.StartInfo.UseShellExecute = false;    // set up output redirection    proc.StartInfo.RedirectStandardOutput = true;    proc.StartInfo.RedirectStandardError = true;        proc.EnableRaisingEvents = true;    proc.StartInfo.CreateNowindow = true;    // Set the data received handlers    proc.ErrorDataReceived += proc_DataReceived;    proc.OutputDataReceived += proc_DataReceived;    proc.Start();    proc.BeginErrorReadline();    proc.BeginoutputReadline();    proc.WaitForExit();    if (proc.ExitCode == 0)    {        out_txtbx.AppendText("Success." + Environment.Newline);    }    else    {        out_txtbx.AppendText("Failed." + Environment.Newline);    }}

然后使用此输出处理程序捕获和处理数据,

// Handle the date received by the console processvoID proc_DataReceived(object sender,DataReceivedEventArgs e){    if (e.Data != null)    {        if ((e.Data.EndsWith("DONE.")) || (e.Data.EndsWith("Failed.")) ||            (e.Data.StartsWith("reset")))        {            // This crashes the application,but is supposedly the correct method            this.AppendText(e.Data + Environment.Newline);            // This works,but the deBUGger keeps warning me that the call            // is not thread safe            //out_txtbx.AppendText(e.Data + Environment.Newline);        }    }}

然后像这样追加控制台文本,

delegate voID AppendTextDelegate(string text);// Thread-safe method of appending text to the console Boxprivate voID AppendText(string text){    // Use a delegate if called from a different thread,// else just append the text directly    if (this.out_txtbx.Invokerequired)    {        // Application crashes when this line is executed        out_txtbx.Invoke(new AppendTextDelegate(this.AppendText),new object[] { text });    }    else    {        this.out_txtbx.AppendText(text);    }}

从我看到的所有文档和示例看来,这似乎是正确的方法,除了它在调用out_txtbx.Invoke时崩溃应用程序.

什么可以被打破,有什么替代方法可以做到这一点？

解决方案(正如Hans Passant所指出的那样)

问题是该应用程序由于线路而陷入“致命的拥抱”,

proc.WaitForExit();

该行应删除,方法应如下所示,

private voID runconsoleApp(){    Process proc = new Process();    proc.StartInfo.filename = "app.exe";    proc.StartInfo.Arguments = "-a -b -c";    proc.StartInfo.UseShellExecute = false;    // set up output redirection    proc.StartInfo.RedirectStandardOutput = true;    proc.StartInfo.RedirectStandardError = true;        proc.EnableRaisingEvents = true;    proc.StartInfo.CreateNowindow = true;    // Set the data received handlers    proc.ErrorDataReceived += proc_DataReceived;    proc.OutputDataReceived += proc_DataReceived;    // Configure the process exited event    proc.Exited += new EventHandler(ProcExited);    proc.Start();    proc.BeginErrorReadline();    proc.BeginoutputReadline();    // This blocks the main thread and results in "deadly embrace"    // The Process.Exited event should be used to avoID this.    //proc.WaitForExit();}

并应提供事件处理程序,

/// <summary>/// Actions to take when console process completes/// </summary>private voID ProcExited(object sender,System.EventArgs e){    Process proc = (Process)sender;    // Wait a short while to allow all console output to be processed and appended    // before appending the success/fail message.    Thread.Sleep(40);    if (proc.ExitCode == 0)    {        this.AppendText("Success." + Environment.Newline);        ExitBootloader();    }    else    {        this.AppendText("Failed." + Environment.Newline);    }    proc.Close();}

解决方法

proc.WaitForExit();

它被称为死锁.您的主线程被阻止,等待进程退出.这使它无法承担基本职责.就像保持UI更新一样.并确保调度Control.Invoke()请求.这会阻止AppendText()方法完成.这会停止退出的过程.这会阻止你的UI线程通过WaitForExit()调用. “致命的拥抱”,又名死锁.

你不能阻止你的主线程.请改用Process.Exited事件.

总结

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