将console.writeLine（）消息传递到文本文件 [英] Pipe console.writeLine() messages to a text file

问题描述

我想知道实现记录器的最佳方法是什么，该记录器实际上会吃掉所有 Console.WriteLine（）消息并吐出所有这些消息的文本文件。

I wonder what the best approach is in implementing a logger which essentially eats all Console.WriteLine() messages and spits out a text file of all these messages.

我知道我可以使用 StringBuilder 并通过执行用所有消息填充它。 出现 Console.WriteLine 的任何地方...但是我正在寻找比这更神奇的东西。通过某种方式，我不必编写与现有代码中的 Console.WriteLine s一样多的代码行。

I know I could use a StringBuilder and populate it with all the messages by doing .AppendLine wherever Console.WriteLine occurs...but I am looking for something more magical than that. Some way using which I don't have to write as many lines of code as Console.WriteLines in existing code.

如果您错过了标签，这是针对C＃4.0控制台应用程序的。

And in case you missed the tags, this is for a C#4.0 console application.

推荐答案

我假设您是want是写入标准输出和文件的流。也就是说，您希望所有内容仍显示在控制台上，但是您还希望将其写入文件中。 （如果只想将输出重定向到文件，则可以从命令行执行。）

I assume what you want is a stream that writes to standard out and to a file. That is, you want everything to still show up on the console, but you also want it to be written to a file. (If you just wanted to redirect output to a file, you could do that from the command line.)

您需要创建自己的 TextWriter 派生的类，并使其实际输出。您调用 Console.SetOut 使控制台写入您的 TextWriter 。

You need to create your own TextWriter-derived class, and have it do the actual output. You call Console.SetOut to make the console write to your TextWriter.

class ConsoleLogger: TextWriter
{
    private TextWriter ConsoleOutputStream;
    private StreamWriter LogOutputStream;
    public ConsoleLogger(string logFilename)
    {
        ConsoleOutputStream = Console.Out;
        // Initialize your log file
        LogOutputStream = new StreamWriter(logFilename);
    }

    public void Write(string s)
    {
        ConsoleOutputStream.Write(s);
        LogOutputStream.Write(s);
    }

    // Other Write functions format their arguments and call Write(string).
}

在使用此功能的程序中：

And in the program that uses this:

private ConsoleLogger MyLogger;
const string LogFilename = "ConsoleLog.txt";
void Main()
{
    MyLogger = new ConsoleLogger(LogFilename);
    Console.SetOut(MyLogger);
}

您不必覆盖所有 TextWriter 方法。正如文档所述，派生类必须至少实现 TextWriter.Write（Char）方法以创建 TextWriter 的有用实例。

You don't have to override all the TextWriter methods. As the documentation says, "A derived class must minimally implement the TextWriter.Write(Char) method to make a useful instance of TextWriter."

我做了类似的事情，并且效果很好。

I've done something similar to this, and it works quite well.

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