C# 实现log日志系统的方法

开发需要，实现一个简单日志系统，废话不多说，直接上代码。

以下基于winform实现。

首先nuget安装Nlog。不会使用nuget自行百度。

using NLog;

namespace LogDemo
{
    public partial class Form1 : Form
    {
        private static Logger logger = LogManager.GetCurrentClassLogger();
        public Form1()
        {
            InitializeComponent();
            LogManager.Configuration = new NLog.Config.XmlLoggingConfiguration("nlog.config");
        }

        private async void btnLogDebug_Click(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                logger.Debug("Debug message logged.");
            });
        }

        private async void btnLogInfo_Click(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                logger.Info("Info message logged.");
            });
        }

        private async void btnLogWarning_Click(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                logger.Warn("Warning message logged.");
            });
        }

        private async void btnLogError_Click(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                logger.Error("Error message logged.");
            });
        }

        private async void btnLogException_Click(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                try
                {
                    throw new InvalidOperationException("Demo exception thrown.");
                }
                catch (Exception ex)
                {
                    logger.Error(ex, "Exception caught and logged.");
                }
            });
        }
    }
}

其次，配置config。

新建一个Nlog.config文件，放入根目录。

<?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">

<targets>
<target xsi:type="File" name="fileTarget" fileName="${basedir}/logs/${shortdate}.log"
layout="${longdate} ${level} ${message} ${exception:format=tostring}" />
</targets>

<rules>
<logger name="*" minlevel="Trace" writeTo="fileTarget" />
</rules>
</nlog>