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？

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 process void 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); } } } 

然后像这样附加控制台文本，

 delegate void AppendTextDelegate(string text); // Thread-safe method of appending text to the console box private 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 （Hans Passant指出）

问题是由于线路，应用程序陷入了“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，

 /// 
 /// Actions to take when console process completes /// 
 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(); } 

 proc.WaitForExit(); 

 out_txtbx.Invoke(new AppendTextDelegate(this.AppendText), text);