How to create a LoggerFactory with a ConsoleLoggerProvider?

In Microsoft.Extensions.Logging 3.0+, you can use the much simpler LoggerFactory.Create:

var loggerFactory = LoggerFactory.Create(builder =>
{
    builder.AddFilter("Microsoft", LogLevel.Warning)
           .AddFilter("System", LogLevel.Warning)
           .AddFilter("SampleApp.Program", LogLevel.Debug)
           .AddConsole();
});

For Microsoft.Extensions.Logging version 2.2+, you can build an ILoggerFactory without using obsolete methods via Microsoft’s dependency injection framework. It’s a little less verbose than the 2.1 version where everything is constructed by hand. Here’s how:

var serviceCollection = new ServiceCollection();
serviceCollection.AddLogging(builder => builder
    .AddConsole()
    .AddFilter(level => level >= LogLevel.Information)
);
var loggerFactory = serviceCollection.BuildServiceProvider()
    .GetService<ILoggerFactory>();

See also:

• Migrate from Microsoft.Extensions.Logging 2.1 to 2.2 or 3.0