我所说的方法，比方说， FizzBu​​zz（），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 FizzBu​​zz 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.

推荐答案

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