PM> Install-Package Microsoft.Extensions.Logging
PM> Install-Package Microsoft.Extensions.Logging.Console
namespace DotnetCoreConsoleApp
{ class Program { static void Main(string[] args) { ILoggerFactory loggerFactory = new LoggerFactory( new[] { new ConsoleLoggerProvider((_, __) => true, true) } ); //or //ILoggerFactory loggerFactory = new LoggerFactory().AddConsole(); ILogger logger = loggerFactory.CreateLogger<Program>(); logger.LogInformation("This is log message."); } }
}

namespace Microsoft.Extensions.Logging
{ /// <summary> /// Defines logging severity levels. /// </summary> public enum LogLevel { /// <summary> /// Logs that contain the most detailed messages. These messages may contain sensitive application data. /// These messages are disabled by default and should never be enabled in a production environment. /// </summary> Trace = 0, /// <summary> /// Logs that are used for interactive investigation during development. These logs should primarily contain /// information useful for debugging and have no long-term value. /// </summary> Debug = 1, /// <summary> /// Logs that track the general flow of the application. These logs should have long-term value. /// </summary> Information = 2, /// <summary> /// Logs that highlight an abnormal or unexpected event in the application flow, but do not otherwise cause the /// application execution to stop. /// </summary> Warning = 3, /// <summary> /// Logs that highlight when the current flow of execution is stopped due to a failure. These should indicate a /// failure in the current activity, not an application-wide failure. /// </summary> Error = 4, /// <summary> /// Logs that describe an unrecoverable application or system crash, or a catastrophic failure that requires /// immediate attention. /// </summary> Critical = 5, /// <summary> /// Not used for writing log messages. Specifies that a logging category should not write any messages. /// </summary> None = 6, }
}