是否有可能拦截控制台输出？

问题描述：

我所说的方法，比方说， FizzBuzz（），在这我管不着。使用这个方法输出一堆东西到控制台 Console.WriteLine 。

I call a method, say, FizzBuzz(), over which I have no control. This method outputs a bunch of stuff to the Console using Console.WriteLine.

是否有可能对我来说，拦截由 FizzBuzz 方法生成的输出？请注意，我的应用程序是一个控制台应用程序本身。

Is it possible for me to intercept the output being generated by the FizzBuzz method? Note that my application is a Console app itself.

答

是的，很可能的：

var consoleOut = new StringWriter();
Console.SetOut(consoleOut);
Console.WriteLine("This is intercepted."); // This is not written to console
File.WriteAllText("ConsoleOutput.txt", consoleOut.ToString());

后来，如果要停止截获控制台输出，使用如下修改：

Later on if you want to stop intercepting the console output, use modification below:

var stdOut = Console.Out;
// Above interceptor code here..
Console.SetOut(stdOut); // Now all output start going back to console window

还是 OpenStandardOutput 做，而不需要先保存标准流是相同的：

Or the OpenStandardOutput does the same without the need to save the standard stream first:

// Above interceptor code here..
var standardOutput = new StreamWriter(Console.OpenStandardOutput());
standardOutput.AutoFlush = true;
Console.SetOut(standardOutput); // Now all output starts flowing back to console

是否有可能拦截控制台输出？

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