项目结构

引入依赖

log4net.dll

配置程序集

在AssemblyInfo.cs的最后一行添加以下内容

[assembly: log4net.Config.XmlConfigurator(Watch = true)]

配置app.config

测试

class Program{    public static readonly ILog log = LogManager.GetLogger(typeof(Program));    static void Main(string[] args)    {        log.Info("哈哈");        try        {            int zero = 0;            var a = 1 / zero;        }        catch (Exception ex)        {            log.Error("呜呜", ex);        }    }}