.Net 6.0 .Net7.0 .Net8.0 .Net9.0 使用 Serilog 按日志等级写入日志及 appsetting.json 配置方式实现

前言

最近使用最新版的Serilog记录日志时，发现以前有些关于Serilog的Nuget弃用了，最关键的是有些配置写法也改变，于是就整理了一下最新版的Serilog配置方式(appsetting.json)的使用

说明：我是用的.Net6，最新长期支持版到.Net8了，不过Serilog我用的是最新版，配置方式都一样

1.安装Serilog相关Nuget包

新版Serilog相关Nuget

Serilog.AspNetCore
Serilog.Expressions
Serilog.Sinks.File

也可以把下面代码直接放入.csjproj工程项目文件中，把这三个包引用放进ItemGroup标签内，所需Nuget包会自动下载

本文项目使用.Net9.0：

.NET6.0、.NET7.0、.NET8.0 Serilog版本如下：

较旧版本如下：

2.Program代码如下

.NET6.0、.NET7.0、.NET8.0 Program.cs代码如下： 虽然使用.NET6.0 写法基本一致

using Serilog;
namespace WebAppNet6_Serilog
{
public class Program
{
public static void Main(string[] args)
{
var builder = WebApplication.CreateBuilder(args);
//使用Serilog
builder.Host.UseSerilog((context, logger) =>
{
//Serilog读取配置
logger.ReadFrom.Configuration(context.Configuration);
logger.Enrich.FromLogContext();
});

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}

app.UseAuthorization();

app.MapControllers();

app.Run();
}
}
}

.NET 9.0 Program.cs代码：

using Serilog;

var builder = WebApplication.CreateBuilder(args);

//使用Serilog
builder.Host.UseSerilog((context, logger) =>
{
//Serilog读取配置
logger.ReadFrom.Configuration(context.Configuration);
logger.Enrich.FromLogContext();
});

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
builder.Services.AddOpenApi();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.MapOpenApi();
}

app.UseAuthorization();

app.MapControllers();

app.Run();

3.配置文件(appsetting.json)代码如下

"Serilog": {
//"Using": [
// "Serilog.Sinks.RollingFile", //老版本的写入日志文件的Nuget包，现在已经弃用，请改用Serilog.Sinks.File
// "Serilog.Sinks.Console",
// "Serilog.Filters.Expressions" //老版本的日志过滤Nuget包，现在已经弃用，请改用Serilog.Expressions
//],
"Using": [ "Serilog.Sinks.File", "Serilog.Expressions" ],
"MinimumLevel": {
"Default": "Information", //最小记录日志级别
"Override": {
"Default": "Information",
"System": "Information",
"Microsoft": "Information"
}
},
"Enrich": [ "FromLogContext", "WithThreadId" ],
"WriteTo": [
{
"Name": "Console",
"Args": {
"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss,fff} [{Level}] [{SourceContext}] {Message:lj}{NewLine}{Exception}"
}
},
{
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l = 'Information'"
}
}
],
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "Logs/Info/log.txt",
"rollingInterval": "Day",
//"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss,fff} LogLevel:{Level} {Message:lj}{NewLine}{Exception}"
"outputTemplate": "【时间】{Timestamp:yyyy-MM-dd HH:mm:ss,fff}{NewLine}【等级】[{Level}]{NewLine}【消息】[{SourceContext}] {Message:lj}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
},
{
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l= 'Warning'"
}
}
],
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "Logs/Warn/log.txt",
"rollingInterval": "Day",
//"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss,fff} WARNING {ClassName}:0 - [{Version}] [{HttpRequestIP}] [{AppName}] {Message:lj}{NewLine}{Exception}"
//"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss,fff}[{Level}]{HttpRequestId}{Message:lj}{NewLine}{Exception}{NewLine}"
"outputTemplate": "【时间】{Timestamp:yyyy-MM-dd HH:mm:ss,fff}{NewLine}【等级】[{Level}]{NewLine}【消息】[{SourceContext}] {Message:lj}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
},
{
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l= 'Error'"
}
}
],
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "Logs/Error/log.txt",
"rollingInterval": "Day",
//"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss,fff} ERROR {ClassName}:0 - [{Version}] [{HttpRequestIP}] [{AppName}] {Message:lj}{NewLine}{Exception}"
"outputTemplate": "【时间】{Timestamp:yyyy-MM-dd HH:mm:ss,fff}{NewLine}【等级】[{Level}]{NewLine}【消息】[{SourceContext}] {Message:lj}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
}

]
}

4.依赖注入方式使用Serilog记录日志文件

.NET6.0、.NET7.0、.NET8.0 WeatherForecastController.cs代码如下：

private readonly ILogger<WeatherForecastController> _logger;

//注入日志
public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
_logger = logger;
}

[HttpGet(Name = "GetWeatherForecast")]
public IEnumerable<WeatherForecast> Get()
{
//记录日志
_logger.LogInformation("测试LogInformation");
_logger.LogWarning("测试LogWarning");
_logger.LogError("测试LogError");
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateTime.Now.AddDays(index),//如果这里报错，请看下面.NET9.0代码
TemperatureC = Random.Shared.Next(-20, 55),
Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray();
}

.NET 9.0 SerilogController.cs代码：

[Route("api/[controller]")]
[ApiController]
public class SerilogController : ControllerBase
{
private readonly ILogger<SerilogController> _logger;

//注入日志
public SerilogController(ILogger<SerilogController> logger)
{
_logger = logger;
}

private static readonly string[] Summaries = new[]
{
"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
};

[HttpGet(Name = "SerilogTest")]
public IEnumerable<WeatherForecast> Get()
{
//记录日志
_logger.LogInformation("测试LogInformation");
_logger.LogWarning("测试LogWarning");
_logger.LogError("测试LogError");
return Enumerable.Range(1, 5).Select(index => new WeatherForecast
{
Date = DateOnly.Parse(DateTime.Now.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture)),
TemperatureC = Random.Shared.Next(-20, 55),
Summary = Summaries[Random.Shared.Next(Summaries.Length)]
})
.ToArray();
}
}

调试运行后，复制下面启动后界面输出的地址到浏览器，打开即可：