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Monthly Downloads: 107
Programming language: C#
License: Copyright (c) 2017 Vitalii Fedorchenko
Tags: Logging     Logfiles     NetCore     Netstandard     File    

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README

NReco.Logging.File

Simple and efficient file logger provider for .NET Core (any version) without additional dependencies.

NuGet Release

  • very similar to standard ConsoleLogger but writes to a file
  • can append to a file
  • supports rolling file behaviour and can control total log size
  • suitable for intensive concurrent usage: has internal message queue to avoid threads blocking

How to use

Add NReco.Logging.File package reference and initialize file logging provider:

.NET Core 2.x/3.x .NET Core 1.x
In services.AddLogging In Startup.cs Configure method
loggingBuilder.AddFile("app.log", append:true);orvar loggingSection = Configuration.GetSection("Logging");loggingBuilder.AddFile(loggingSection); loggerFactory.AddFile("app.log", append:true);orvar loggingSection = Configuration.GetSection("Logging");loggerFactory.AddFile(loggingSection);

Example of configuration section from appsettings.json:

"Logging": {
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Error"
    },
    "File": {
        "Path": "app.log",
        "Append": "True",
        "FileSizeLimitBytes": 0,  // use to activate rolling file behaviour
        "MaxRollingFiles": 0  // use to specify max number of log files
    }
}

Rolling File

This feature is activated with FileLoggerOptions properties: FileSizeLimitBytes and MaxRollingFiles. Lets assume that file logger is configured for "test.log":

  • if only FileSizeLimitBytes is specified file logger will create "test.log", "test1.log", "test2.log" etc
  • use MaxRollingFiles in addition to FileSizeLimitBytes to limit number of log files; for example, for value "3" file logger will create "test.log", "test1.log", "test2.log" and again "test.log", "test1.log" (old files will be overwritten).

Custom log entry formatting

You can specify FileLoggerProvider.FormatLogEntry handler to customize log entry content. For example, it is possible to write log entry as JSON array:

loggerFactory.AddProvider(new NReco.Logging.File.FileLoggerProvider("logs/app.js", true) {
    FormatLogEntry = (msg) => {
        var sb = new System.Text.StringBuilder();
        StringWriter sw = new StringWriter(sb);
        var jsonWriter = new Newtonsoft.Json.JsonTextWriter(sw);
        jsonWriter.WriteStartArray();
        jsonWriter.WriteValue(DateTime.Now.ToString("o"));
        jsonWriter.WriteValue(msg.LogLevel.ToString());
        jsonWriter.WriteValue(msg.EventId.Id);
        jsonWriter.WriteValue(msg.Message);
        jsonWriter.WriteValue(msg.Exception?.ToString());
        jsonWriter.WriteEndArray();
        return sb.ToString();
    }
});

(in case of .NET Core 2 use loggingBuilder.AddProvider instead of loggerFactory.AddProvider).

License

Copyright 2017-2020 Vitaliy Fedorchenko and contributors

Distributed under the MIT license


*Note that all licence references and agreements mentioned in the NReco.Logging.File README section above are relevant to that project's source code only.