C＃'System.InvalidOperationException'不能在过程流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

我想从一个CMD过程反复读，反复打印输出为好，但我使用whil​​e循环是一个Task.Run里面，以便它不锁程序，但有一些问题，异步与非异步方法，我不太明白。我得到我需要没有在Task.Run的pProcess.StandardOutput.ReadToEnd，但我怎么会在我的code实现这个？谢谢！

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);
        }
     });

推荐答案

有同在一个单独的任务与 Task.Run 执行此code，我认为没有问题您在code在什么地方正在调用像BeginErrorReadLine或BeginOutputReadLine一些异步方法。这SO的回答可以帮助：我想读在C＃过程的输出，但我得到这个消息＆QUOT;不能混用同步和异步在工艺流运QUOT;。

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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