如何在控制台中格式化日志输出？（Microsoft.Extensions.Logging）

Question

I make logs output like this:

static void Main(string[] args)
    {
        ILoggerFactory loggerFactory = new LoggerFactory()
                                             .AddConsole();

        ILogger logger = loggerFactory.CreateLogger<Program>();

        logger.LogInformation(
          "This is a test of the emergency broadcast system.");

        Console.WriteLine("Press any key...");
        Console.Read();
    }

And I receive messages:

info: ConsoleLogging.Program[0]

This is a test of the emergency broadcast system.

But I would like so:

info: This is a test of the emergency broadcast system.

How to format the output of logs in the console? I use the libraries Microsoft.Extensions.Logging, Microsoft.Extensions.Logging.Console.

Answer 1

I'm trying to do the same thing.

I started out by creating a class called SimpleConsoleLogger that inherits from ConsoleLogger so that I could override the WriteMessage() method, but the code in the original method relies on some private internal structs and fields, and I didn't want to write the whole method from scratch.

I ended up creating my own SimpleConsoleLogger class based off the source code for ConsoleLogger.cs where I could remove the following lines in WriteMessage() in the category and event id section:

logBuilder.Append(logName);
logBuilder.Append("[");
logBuilder.Append(eventId);
logBuilder.AppendLine("]");

...and the following line in the message section:

logBuilder.Append(_messagePadding);

I then had to create a SimpleConsoleLoggerProvider class based on ConsoleLoggerProvider , where I substituted my SimpleConsoleLogger class in the code, and did the same with ConsoleLoggerExtensions in order to create SimpleConsoleLoggerExtensions , so that I may wire my logger into the factory as follows:

_loggerFactory = new LoggerFactory().AddSimpleConsole();

This is not the most simple solution, so the class name is a bit of a misnomer, but it works.