将命令提示符输出重定向到Winform时遇到Process类的问题 [英] Having trouble with Process class while redirecting command prompt output to winform

问题描述

我当时在市场上寻找选项卡式命令提示符应用程序，因为当我想到自己创建自己的可能性时，我厌倦了多个命令提示符窗口使我的一个桌面屏幕混乱。虽然我知道它不会像独立产品那样出色，但是我认为创建自己的产品只是为了更加熟悉 System.Diagnostic类（Process，ProcessStartInfo等）是一个很好的练习。

I was in the market looking for a "tabbed" command prompt application, as I was sick of having multiple command prompt windows cluttering one of my desktop screens, when I thought of a possibility of creating my own. While I understand that it won't be as great as a standalone product, but I think it will be a good exercise to create my own just to get more familiar with the "System.Diagnostic" classes (Process, ProcessStartInfo, etc.) that I've never really played around with before.

我几乎刚刚创建了一个准系统winforms应用，该应用具有2个选项卡（包含richtextfields），一个textfield（输入命令）和一个按钮（实际运行命令）。

I've pretty much just created a barebones winforms app that has 2 tabs (that contain richtextfields), a textfield (to enter the command) and a button (to actually run the command).

我发现了许多文章，展示了如何运行命令，但实际上我遇到了问题执行命令并将结果返回到richtextbox。这是我根据目前知道的信息创建的方法：
（根据之前的答案进行了更新）

I found various posts that show how to run a command, but I'm having problems actually executing a command and returning the results to the richtextbox. Here is a method I created based on what info I know for now: (Updated base on previous answers)

public void GetConsoleOuput(string command)
{
  string outputString;

  ProcessStartInfo startupInfo = new ProcessStartInfo()
  startInfo.FileName = "cmd.exe";
  startInfo.RedirectStandardOuput = true;
  startInfo.WindowStyle = ProcessWindowStyle.Hidden:
  startInfo.UseShellExecute = false;

  startInfo.Arguments("/C " + command);

  Process process = new Process()
  process.StartInfo = startInfo;
  process.OutputDataReceived += new DataReceivedEventHandler(AppendRichBoxText);

  process.Start()
  process.BeginOutputReadLine();

  process.WaitForExit();
  process.Close();
}

public void AppendRichBoxTet(object sender, DataReceivedEventArgs args)
{
  string outputString = args.Data;

  // need to have the richTextBox updated using it's own thread
  richTextBox.BeginInvoke( /* not sure what to put inside here */);
}

此方法的使用是将输出文本附加到richtextbox上

The use of this method would be to keep appending the output text to the richtextbox.

这时，我仍然停留在如何执行BeginInvoke方法上，以便该richTextBox可以在自己的线程上对其文本进行更新。

At this point, I'm stuck on how to execute the BeginInvoke method so that this richTextBox will have it's text updated on it's own thread.

推荐答案

是的，可以。可以使用事件驱动的输出重定向API来代替使用 ReadToEnd （它将阻塞直到过程完成）：

Yes, you can. Instead of using ReadToEnd (which will block until the process finishes) you can use the event-driven output redirection API:

• 按已设置的方式设置 RedirectStandardOutput


• 启动该过程


• 致电 BeginOutputReadLine


• 订阅 OutputDataReceived 事件，并使用 Control.BeginInvoke 进行编组回到UI线程以附加到 RichTextBox 。

• Set RedirectStandardOutput as you are doing already
• Start the process
• Call BeginOutputReadLine
• Subscribe to the OutputDataReceived event and use Control.BeginInvoke to marshal back to the UI thread to append to the RichTextBox.

有一个示例在 BeginOutputReadLine 文档中。

编辑：对于 Control.BeginInvoke ，这可能是最简单的解决方案：

For the Control.BeginInvoke, this would probably be the simplest solution:

public void AppendRichBoxTet(object sender, DataReceivedEventArgs args)
{
  string outputString = args.Data;
  MethodInvoker append = () => richTextBox.AppendText(outputString);
  richTextBox.BeginInvoke(append);
}

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