Asp.net core中，自带的Log是在当selfhost运行时，在控制台中输出，不便于查阅，如果用一个log架框，把日志持久化，便于查询．
NLog是一个免费的日志记录框架，专门为.net平台下的框架提供日志功能，本文主要说明asp.net core下怎么使用NLog。
首先用Nuget安装NLog.Extensions.Logging和NLog.Web.AspNetCore两个类库。
修改project.json，在publishOptions中添加”nlog.config节点”
"publishOptions": {
"include": [
"wwwroot",
"**/*.cshtml",
"appsettings.json",
"web.config",
"nlog.config"
]
}
在StartUp.cs中添加
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public
void
ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddMvc();
//为NLog.web注入HttpContextAccessor
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
……
}
public
void
Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
//添加NLog到.net core框架中
loggerFactory.AddNLog();
//添加NLog的中间件
app.AddNLogWeb();
//指定NLog的配置文件
env.ConfigureNLog(
"nlog.config"
);
……
}
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HomeController.cs中是自定义日志
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static
Logger Logger = LogManager.GetCurrentClassLogger();
public
IActionResult Index()
{
Logger.Info(
"普通信息日志"
);
Logger.Debug(
"调试日志"
);
Logger.Error(
"错误日志"
);
Logger.Fatal(
"异常日志"
);
Logger.Warn(
"警告日志"
);
Logger.Trace(
"跟踪日志"
);
Logger.Log(NLog.LogLevel.Warn,
"Log日志"
);
try
{
int
i = 0;
var
a = 10 / i;
}
catch
(Exception exc)
{
//异常日志
Logger.Fatal(exc, exc.Message);
}
return
View();
}
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NLog.config，有两种日志，记录在C:\temp下，一种是全部日志，一种是自己通过NLog函数记录的日志。如果日志库异常，会产生在c:\temp\internal-nlog.txt下，
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<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
nlog
xmlns
=
"http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi
=
"http://www.w3.org/2001/XMLSchema-instance"
autoReload
=
"true"
internalLogLevel
=
"Warn"
internalLogFile
=
"c:\temp\internal-nlog.txt"
>
<!-- ASP.NET Core 使用 -->
<
extensions
>
<
add
assembly
=
"NLog.Web.AspNetCore"
/>
</
extensions
>
<
targets
>
<!-- 全部日志文件 -->
<
target
xsi:type
=
"File"
name
=
"allfile"
fileName
=
"c:\temp\nlog-all-${shortdate}.log"
layout
=
"${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}"
/>
<!-- 自定义记录的日志文件 -->
<
target
xsi:type
=
"File"
name
=
"ownFile-web"
fileName
=
"c:\temp\nlog-own-${shortdate}.log"
layout
=
"${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}| ${message} ${exception}|url: ${aspnet-request-url}|action: ${aspnet-mvc-action}"
/>
<
target
xsi:type
=
"Null"
name
=
"blackhole"
/>
</
targets
>
<
rules
>
<!--所括asp.net core下的全部日志-->
<
logger
name
=
"*"
minlevel
=
"Trace"
writeTo
=
"allfile"
/>
<!--仅自定义记录的日志文件-->
<
logger
name
=
"Microsoft.*"
minlevel
=
"Trace"
writeTo
=
"blackhole"
final
=
"true"
/>
<
logger
name
=
"*"
minlevel
=
"Trace"
writeTo
=
"ownFile-web"
/>
</
rules
>
</
nlog
>
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Layout中$后的数据就是要写日志的内容，关于这些数据可参考https://github.com/nlog/nlog/wiki/Layout-Renderers，可以根据自己的需要，选择要保存的日志数据，如下图是web中的日志数据：
如果想把日志保存到数据库中，可以把NLog.config修改如下：
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<?
xml
version
=
"1.0"
encoding
=
"utf-8"
?>
<
nlog
xmlns
=
"http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi
=
"http://www.w3.org/2001/XMLSchema-instance"
autoReload
=
"true"
internalLogLevel
=
"Warn"
internalLogFile
=
"c:\temp\internal-nlog.txt"
>
<!-- ASP.NET Core 使用 -->
<
extensions
>
<
add
assembly
=
"NLog.Web.AspNetCore"
/>
</
extensions
>
<!-- 注意配置连接字符串 -->
<
targets
>
<
target
name
=
"database"
xsi:type
=
"Database"
connectionString
=
"server=.;database=nglogdb;uid=SQL用户名;pwd=SQL密码;"
>
<
commandText
>
INSERT INTO [dbo].[NLog] (
[MachineName],
[SiteName],
[Logged],
[Level],
[UserName],
[Message],
[Logger],
[Properties],
[Host],
[Controller],
[Action],
[Url],
[CallSite],
[Exception]
) VALUES (
@machineName,
@siteName,
@logged,
@level,
@userName,
@message,
@logger,
@properties,
@host,
@controller,
@action,
@url,
@callSite,
@exception
);
</
commandText
>
<
parameter
name
=
"@machineName"
layout
=
"${machinename}"
/>
<
parameter
name
=
"@siteName"
layout
=
"${iis-site-name}"
/>
<
parameter
name
=
"@logged"
layout
=
"${date}"
/>
<
parameter
name
=
"@level"
layout
=
"${level}"
/>
<
parameter
name
=
"@username"
layout
=
"${aspnet-user-identity}"
/>
<
parameter
name
=
"@message"
layout
=
"${message}"
/>
<
parameter
name
=
"@logger"
layout
=
"${logger}"
/>
<
parameter
name
=
"@properties"
layout
=
"${all-event-properties:separator=|}"
/>
<
parameter
name
=
"@host"
layout
=
"${aspnet-request-host}"
/>
<
parameter
name
=
"@controller"
layout
=
"${aspnet-MVC-Controller}"
/>
<
parameter
name
=
"@action"
layout
=
"${aspnet-MVC-Action}"
/>
<
parameter
name
=
"@url"
layout
=
"${aspnet-request-url}"
/>
<
parameter
name
=
"@callSite"
layout
=
"${callsite}"
/>
<
parameter
name
=
"@exception"
layout
=
"${exception:tostring}"
/>
</
target
>
</
targets
>
<
rules
>
<
logger
name
=
"*"
minlevel
=
"Trace"
writeTo
=
"database"
/>
</
rules
>
</
nlog
>
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数据库数据如下：
本文转自桂素伟51CTO博客，原文链接： http://blog.51cto.com/axzxs/1894584，如需转载请自行联系原作者
