C＃'System.InvalidOperationException'不能在进程流上混合同步和异步操作 [英] C# 'System.InvalidOperationException' Cannot mix synchronous and asynchronous operation on process stream

问题描述

我试图从一个CMD进程重复读取，并打印输出重复以及，但我使用的while循环是在Task.Run内，以便它不锁定程序，但有一些问题与ASync和非ASync方法，我不太明白。我得到，我需要在一个Task.Run中没有pProcess.StandardOutput.ReadToEnd，但我如何在我的代码实现这一点？感谢！

  Task.Run（（）=> 
 {
 while（true）
 {
 string output = pProcess.StandardOutput.ReadToEnd（）; 
 System.Console.Write（output）; 
} 
}）; 
  

c> c>我认为你正在调用一个单独的任务中执行这个代码没有问题。 Task.Run 一些异步方法像BeginErrorReadLine或BeginOutputReadLine之前的你的代码。这个SO回答可能有帮助：我试图读取在c＃中的进程的输出，但我得到这个消息不能混合同步和异步对过程流进行操作。

I am trying to read from a CMD process repeatedly, and print out the output repeatedly as well, But the while loop I am using is inside a Task.Run so that it doesn't lock the program up, but there is some problem with ASync and non-ASync methods that I don't quite understand. I get that I need to not have the pProcess.StandardOutput.ReadToEnd in a Task.Run, but how would I implement this in my code? Thanks!

Task.Run(() => 
    {
        while (true)
        {
            string output = pProcess.StandardOutput.ReadToEnd();
            System.Console.Write(output);
        }
     });

解决方案

There's no problem with executing this code in a seperate Task with Task.Run I think you're calling some asynchronous method like BeginErrorReadLine or BeginOutputReadLine somewhere before in your code. This SO answer may help: I am trying to read the output of a process in c# but I get this message "Cannot mix synchronous and asynchronous operation on process stream."

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