asp.net core(.net 6.0) Serilog日志基本用法

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为什么要使用Serilog？

Serilog比NLog 功能更为强大，能支持结构化的消息，不像NLog扁平和繁琐，配置也更加方便。支持代码配置、json、xml。但我觉得用代码配置就挺好，nlog就是XML配置太麻烦。

1、nuget 安装 
 Serilog.AspNetCore  会自动安装依赖项

2、（可选，异步写入）nuget 安装 Serilog.Sinks.Async  

3、注册服务配置写入文件

builder.Services.AddLogging(bulid =>
{
     Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Debug()
    .Enrich.FromLogContext()
     WriteTo.Async(config => config.File(
               "d://.log",
               rollingInterval: RollingInterval.Day,
               fileSizeLimitBytes: 1024 * 1024 * 10,//单位字节 不配置时默認1GB
               retainedFileCountLimit: 10,//保留最近多少個文件  不配置时默認31個
               rollOnFileSizeLimit: true,//超過文件大小時 自動創建新文件 
               shared: true)
     ))
    .CreateLogger();
    bulid.AddSerilog();

});

4、随便找个控制器在构造函数注入后即可使用

  [HttpGet(Name = "GetWeatherForecast")]
        public IEnumerable Get()
        {
            while (true)
            {
                _logger.LogInformation("ASDASDASDASDASDADSASDASDASDASDASDADSASDASDASDASDASDADSASDASDASDASDASDADS");
            }
          
           
            
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = Random.Shared.Next(-20, 55),
                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
            })
            .ToArray();
        }

打开d盘找到即可看见日志文本

输出格式如下：

2022-05-28 00:12:35.949 +08:00 [INF] ASDASDASDASDASDADSASDASDASDASDASDADSASDASDASDASDASDADSASDASDAS

（推荐）更高级一些的详细配置，建议把log等级分开配置 推荐配置4种

1、设置好4个路径，对应不同的日志类型

string infoPath = Directory.GetCurrentDirectory() + @"\logs\info\.log"; ;
string waringPath = Directory.GetCurrentDirectory() + @"\logs\waring\.log";
string errorPath = Directory.GetCurrentDirectory() + @"\logs\error\.log";
string fatalPath = Directory.GetCurrentDirectory() + @"\logs\fatal\.log";

2、（推荐，不设也行）设置好模板

string template = "{NewLine}时间:{Timestamp:yyyy-MM-dd HH:mm:ss.fff}{NewLine}等级:{Level}{NewLine}来源:{SourceContext}{NewLine}具体消息:{Message}{NewLine}{Exception}";

3、具体配置

builder.Services.AddLogging(bulid =>
{
     Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Information()
    .Enrich.FromLogContext()
    .WriteTo.Logger(lg => lg.Filter.ByIncludingOnly(lev => lev.Level == LogEventLevel.Information).
     WriteTo.Async(congfig => congfig.File(
               infoPath,
               rollingInterval: RollingInterval.Day,
               fileSizeLimitBytes: 1024 * 1024 * 10,//默認1GB
               retainedFileCountLimit: 10,//保留最近多少個文件  默認31個
               rollOnFileSizeLimit: true,//超過文件大小時 自動創建新文件  
               shared: true,
               outputTemplate: template)
     ))
    //-----------------------------------------------------------------------------------
     .WriteTo.Logger(lg => lg.Filter.ByIncludingOnly(lev => lev.Level == LogEventLevel.Warning).
     WriteTo.Async(congfig => congfig.File(
               waringPath,
               rollingInterval: RollingInterval.Day,
               fileSizeLimitBytes: 1024 * 1024 * 10,
               retainedFileCountLimit: 10,
               rollOnFileSizeLimit: true,
               shared: true,
               outputTemplate: template)
     ))
    //-----------------------------------------------------------------------------------
    .WriteTo.Logger(lg => lg.Filter.ByIncludingOnly(lev => lev.Level == LogEventLevel.Error).
     WriteTo.Async(congfig => congfig.File(
               errorPath,
               rollingInterval: RollingInterval.Day,
               fileSizeLimitBytes: 1024 * 1024 * 10,
               retainedFileCountLimit: 10,
               rollOnFileSizeLimit: true,
               shared: true,
               outputTemplate: template)
     ))
    //-----------------------------------------------------------------------------------
     .WriteTo.Logger(lg => lg.Filter.ByIncludingOnly(lev => lev.Level == LogEventLevel.Fatal).
     WriteTo.Async(congfig => congfig.File(
               fatalPath,
               rollingInterval: RollingInterval.Day,
               fileSizeLimitBytes: 1024 * 1024 * 10,
               retainedFileCountLimit: 10,
               rollOnFileSizeLimit: true,
               shared: true,
               outputTemplate: template)
     ))
    //-----------------------------------------------------------------------------------
    .CreateLogger();
    bulid.AddSerilog();

代码有点多，建议自己做封装

只做了基本配置，不够用的话，具体更多配置或更高级用法自行查询官网。

https://github.com/serilog