1+ using System . Collections . Concurrent ;
2+
3+ var builder = WebApplication . CreateBuilder ( ) ;
4+
5+ // Adjust the minimum level here and see the impact
6+ // on the displayed logs.
7+ // The rule is it will show >= minimum level
8+ // The levels are:
9+ // - Trace = 0
10+ // - Debug = 1
11+ // - Information = 2
12+ // - Warning = 3
13+ // - Error = 4
14+ // - Critical = 5
15+ // - None = 6
16+
17+ builder . Logging . SetMinimumLevel ( LogLevel . Warning ) ;
18+ builder . Logging . AddConsole ( ) ;
19+
20+ var app = builder . Build ( ) ;
21+ Log . Configure ( app . Services . GetRequiredService < ILoggerFactory > ( ) ) ;
22+
23+ app . Run ( context =>
24+ {
25+ var log = Log . CreateLogger ( "main" ) ;
26+ log . LogTrace ( "Trace message" ) ;
27+ log . LogDebug ( "Debug message" ) ;
28+ log . LogInformation ( "Information message" ) ;
29+ log . LogWarning ( "Warning message" ) ;
30+ log . LogError ( "Error message" ) ;
31+ log . LogCritical ( "Critical message" ) ;
32+ return context . Response . WriteAsync ( "Hello world. Take a look at your terminal to see the logging messages." ) ;
33+ } ) ;
34+ app . Run ( ) ;
35+
36+ public static class Log
37+ {
38+ static ILoggerFactory _loggerFactory ;
39+
40+ static readonly ConcurrentDictionary < string , ILogger > _loggers = new ( ) ;
41+
42+ public static void Configure ( ILoggerFactory loggerFactory )
43+ {
44+ _loggerFactory = loggerFactory ?? throw new ArgumentNullException ( nameof ( loggerFactory ) ) ;
45+ }
46+
47+ public static ILogger CreateLogger < T > ( ) => _loggers . GetOrAdd ( typeof ( T ) . FullName , _ => _loggerFactory . CreateLogger < T > ( ) ) ;
48+
49+ public static ILogger CreateLogger ( string categoryName ) => _loggers . GetOrAdd ( categoryName , _ => _loggerFactory . CreateLogger ( categoryName ) ) ;
50+ }
0 commit comments