Asp.Net Core 8.0 使用 Serilog 按日志级别写入日志文件的两种方式

server/2025/1/19 6:13:16/

1、所需的Nuget包

本文项目的版本是.NET 8.0，如果使用其它版本安装适配版本即可。

Serilog.AspNetCore(8.0.2)

Serilog.Sinks.File(5.0.0)

Serilog.Expressions(5.0.0)

2、两种配置方式

2.1 代码形式（Program.cs）

在Program.cs文件中，添加如下代码

//设置Serilog为日志管理
builder.Host.UseSerilog((context, loggerConfiguration) =>
{
loggerConfiguration.MinimumLevel.Override("Microsoft", LogEventLevel.Warning)//最小日志级别
.Enrich.FromLogContext()

.WriteTo.Console()//输出到控制台

//按日志级别分别写入不同的日志文件中（可设置参数outputTemplate模板，有默认这里就不设置了）
.WriteTo.Logger(configure => configure
    .Filter.ByIncludingOnly(e => e.Level == LogEventLevel.Information)//过滤
    .WriteTo.File("Logs/Info/info.txt", rollingInterval: RollingInterval.Day))

.WriteTo.Logger(configure => configure
    .Filter.ByIncludingOnly(e => e.Level == LogEventLevel.Warning)//过滤
    .WriteTo.File("Logs/Warn/warn.txt", rollingInterval: RollingInterval.Day))

.WriteTo.Logger(configure => configure
    .Filter.ByIncludingOnly(e => e.Level == LogEventLevel.Error)//过滤
    .WriteTo.File("Logs/Error/error.txt", rollingInterval: RollingInterval.Day));
});

2.2 配置文件形式（appsetting.json）

2.2.1、appsetting.json文件添加如下配置信息

"Serilog": {
"Using": [ "Serilog.Sinks.File" ],
"MinimumLevel": {
"Default": "Information",//默认日志输出级别
"Override": {
"Microsoft": "Warning",
"System": "Warning"
}
},
"WriteTo": [

{ "Name": "Console" },//输出到控制台

{//info
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [//过滤
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l = 'Information'"
}
}
],
"WriteTo": [//写入
{
"Name": "File",
"Args": {
"path": "Logs/Info/info.txt",
"rollingInterval": "Day",
"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff} [{Level}] {SourceContext}: {Message}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
},

{//warning
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l = 'Warning'"
}
}
],
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "Logs/Warn/warn.txt",
"rollingInterval": "Day",
"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff} [{Level}] {SourceContext}: {Message}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
},

{//error
"Name": "Logger",
"Args": {
"configureLogger": {
"Filter": [
{
"Name": "ByIncludingOnly",
"Args": {
"expression": "@l = 'Error'"
}
}
],
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "Logs/Error/error.txt",
"rollingInterval": "Day",
"outputTemplate": "{Timestamp:yyyy-MM-dd HH:mm:ss.fff} [{Level}] {SourceContext}: {Message}{NewLine}{Exception}{NewLine}"
}
}
]
}
}
}
],
"Enrich": [ "FromLogContext", "WithThreadId" ]
}

2.2.2、在Program.cs文件中添加如下代码进行Serilog的注册使用

//设置Serilog为日志管理
builder.Host.UseSerilog((context, loggerConfiguration) =>
{
//读取配置文件中Serilog配置信息
loggerConfiguration.ReadFrom.Configuration(context.Configuration);
});