在ASP.NET核心应用程序过滤不必要的聊天

Question

我正试图从Microsoft托管程序集中过滤掉所有不必要的聊天，同时仍然允许来自我们自己代码的调试级别消息传递到我们的日志记录目标。

以下是配置NLog并初始化web应用程序的代码。遗憾的是，Microsoft.*和System.*命名空间筛选根本不起作用。结果是，所有消息Debug和更高版本都会被记录下来。

我不想使用旧的nlog.config进程。我希望能够在代码中构建LoggingConfiguration。

我一定错过了一些简单的东西，但我看不出来！

public static void Main(string[] args)
{
// Read configuration from a variety of sources to compose our final IConfiguration
var config = ReadOurConfigFromLotsOfPlaces();
var nLogConfig = new LoggingConfiguration();
var consoleTarget = new ColoredConsoleTarget("console")
{
AutoFlush = true,
ErrorStream = true,
Layout = @"${date:format=yyyy-MM-dd HH:mm:ss.fff} ${level} [${logger}] - ${message}${onexception:${newline}}${exception:format=shortType,message,stackTrace:maxInnerExceptionLevel=5}"
};
nLogConfig.AddTarget(consoleTarget);
nLogConfig.LoggingRules.Add(new LoggingRule("Microsoft.*", LogLevel.Warn, consoleTarget) {Final = true});
nLogConfig.LoggingRules.Add(new LoggingRule("System.*", LogLevel.Warn, consoleTarget) {Final = true});
nLogConfig.LoggingRules.Add(new LoggingRule("*", LogLevel.Debug, consoleTarget));

var logger = NLogBuilder.ConfigureNLog(nLogConfig).GetCurrentClassLogger();
logger.Debug("NLog initialization complete");
try
{
logger.Debug("init main");
CreateHostBuilder(config).Build().Run();
}
catch (Exception exception)
{
logger.Error(exception, "Stopped program because of exception");
throw;
}
finally
{
// Ensure to flush and stop internal timers/threads before application-exit (Avoid segmentation fault on Linux)
LogManager.Shutdown();
}
}
public static IWebHostBuilder CreateHostBuilder(IConfiguration config)
{
// we don't call CreateDefaultBuilder() because we already have assembled the configuration we want to use
return new WebHostBuilder()
.UseConfiguration(config)
.UseKestrel(options => options.UseSystemd())
.UseStartup<Startup>()
.ConfigureLogging(logging =>
{
logging.ClearProviders();
logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
})
.UseNLog();
}

如有任何提示，我们将不胜感激。

Answer 1

Ugh。我现在明白了我的问题："LoggingRules"正在寻找记录器名称和最小/最大级别值之间的正匹配，所以我的前两个LoggingRule对象与来自Microsoft.*和System.*命名空间的消息不匹配，所以规则对这些消息没有任何作用。

为了完成我想要的过滤，这就是解决方案：

var nLogConfig = new LoggingConfiguration();
var consoleTarget = new ColoredConsoleTarget("console")
{
AutoFlush = true,
ErrorStream = true,
Layout = @"${date:format=yyyy-MM-dd HH:mm:ss.fff} ${level} [${logger}] - ${message}${onexception:${newline}}${exception:format=shortType,message,stackTrace:maxInnerExceptionLevel=5}"
};
nLogConfig.AddTarget(consoleTarget);
var nullTarget = new NullTarget("null");
nLogConfig.AddTarget(nullTarget);
// matches every Microsoft.* logger with a LogLevel less than LogLevel.Warn
nLogConfig.LoggingRules.Add(new LoggingRule("Microsoft.*", LogLevel.Trace, LogLevel.Info, nullTarget) {Final = true});
// matches every System.* logger with a LogLevel less than LogLevel.Warn
nLogConfig.LoggingRules.Add(new LoggingRule("System.*", LogLevel.Trace, LogLevel.Info, nullTarget) {Final = true});
// and everything else, LogLevel.Debug and higher
nLogConfig.LoggingRules.Add(new LoggingRule("*", LogLevel.Debug, consoleTarget));