.NET_NLog

步骤

1. 添加依赖

①Microsoft.Extensions.DependencyInjection

②NLog.Extensions.Logging（或Microsoft.Extensions.Logging.___）

Tutorial · NLog/NLog Wiki · GitHub

2.添加nlog.config文件(默认名称, 可改为其他名称, 但需要另行配置)

文件的基础格式可从此处获取: Tutorial · NLog/NLog Wiki · GitHubNLog - Advanced and Structured Logging for Various .NET Platforms - Tutorial · NLog/NLog Wikihttps://github.com/NLog/NLog/wiki/Tutorial#configure-nlog-targets-for-output格式参考(关于config文件的说明在注释部分):

<?xml version="1.0" encoding="utf-8" ?>
<!-- XSD manual extracted from package NLog.Schema: https://www.nuget.org/packages/NLog.Schema-->
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xsi:schemaLocation="NLog NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      autoReload="true"
      internalLogFile="logs/console-example-internal.log"
      internalLogLevel="Info" >

	<!-- the targets to write to -->
	<targets>
		<!-- write logs to file -->
		<!-- archiveAboveSize: 日志文件的最大体积(字节数)|maxArchiveFiles: 日志文件的最大数量|maxArchiveDays: 日志文件的最大天数 -->
		<target xsi:type="File" name="logfile" fileName="logs/console-example.log"
				layout="${longdate}|${level}|${message} |${all-event-properties} ${exception:format=tostring}" />
		<target xsi:type="Console" name="logconsole"
				layout="${longdate}|${level}|${message} |${all-event-properties} ${exception:format=tostring}" />
	</targets>

	<!-- rules to map from logger name to target -->
	<rules><!-- 从上至下依次匹配 -->
		<!-- name: 匹配规则(类名)|minlevel: 最小日志输出等级|maxlevel: 最大日志输出等级|writeTo: 日志输出文件|final=true: 若匹配成功则不再向下匹配 -->
		<logger name="*" minlevel="Trace" writeTo="logfile,logconsole"/>
	</rules>
</nlog>

3.将nlog.config文件设置为"始终复制"或在项目设置页中将"Never"改为"Always"

示例

Program.cs

internal class Program
{
    static void Main(string[] args)
    {
        ServiceCollection services = new();

        services.AddLogging(logBuilder=> {
            //logBuilder.AddConsole();                    // Microsoft.Extensions.Logging
            //logBuilder.SetMinimumLevel(LogLevel.Debug); // Microsoft.Extensions.Logging
            logBuilder.AddNLog();
        });
        services.AddScoped<Example_1>();

        using ServiceProvider serviceProvider = services.BuildServiceProvider();
        Example_1 example_1 = serviceProvider.GetRequiredService<Example_1>();
        example_1.Start();
    }
}

Example_1.cs

internal class Example_1
{
    ILogger<Example_1> logger;
    public Example_1(ILogger<Example_1> logger)
    {
        this.logger = logger;
    }

    public void Start()
    {
        logger.LogDebug("运行中...");
        try
        {
            File.ReadAllText("A:\\text.txt");
            logger.LogDebug("文件读取成功");
        }
        catch (Exception e)
        {
            logger.LogError(e, "发生错误");
        }
        logger.LogDebug("结束");
    }
}

运行效果