这个日志框架使用的是ASP.NET Core的NLog，用来记录每次请求信息和返回信息。
1.首先创建一个Web应用项目，我选择的是MVC模板：
ml 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="internal-nlog.txt"> <!--define various log targets--> <targets> <!--write logs to file--> <target xsi:type="File" name="allfile" fileName="nlog-all-${shortdate}.log" layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" /> <target xsi:type="File" name="ownFile-web" fileName="nlog-my-${shortdate}.log" layout="${longdate}|${logger}|${uppercase:${level}}|${message} ${exception}" /> <target xsi:type="Null" name="blackhole" /> </targets> <rules> <!--All logs, including from Microsoft--> <logger name="*" minlevel="Trace" writeTo="allfile" /> <!--Skip Microsoft logs and so log only own logs--> <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" /> <logger name="*" minlevel="Trace" writeTo="ownFile-web" /> </rules></nlog>
注意：运行项目时需要复制nlog.config到debug
5.接下来开始自定义中间件
添加一个LogMiddleware类：
public class LogMiddleware { private readonly RequestDelegate _next; private readonly ILogger<LogMiddleware> _logger; public LogMiddlewahttp://www.easck.comre(RequestDelegate next, ILogger<LogMiddleware> logger) { _next = next; _logger = logger; } public async Task Invoke(HttpContext context) { _logger.LogInformation("Request Url:" + context.Request.Path +Environment.NewLine + "Body:" + context.Request.Body.ToString()); await _next.Invoke(context); _logger.LogInformation("Response Url:" + context.Request.Path + Environment.NewLine + "Body:" + context.Response.Body.ToString()); } }再创建一个LogMiddlewareExtensions类：
/// <summary> /// 这是扩展中间件 /// </summary> public static class LogMiddlewareExtensions { public static IApplicationBuilder UseLog(this IApplicationBuilder builder) { return builder.UseMiddleware<LogMiddleware>(); } }这样就编写好一个自定义的中间件。
6.在Configure方法中调用app.UseLog()
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) { loggerFactory.AddNLog(); //添加NLog NLog.LogManager.LoadConfiguration("nlog.config"); app.UseLog(); if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } else { app.UseExceptionHandler("/Home/Error"); app.UseHsts(); } app.UseHttpsRedirection(); app.UseStaticFiles(); app.UseCookiePolicy(); app.UseMvc(routes => { routes.MapRoute( name: "default", template: "{controller=Home}/{action=Index}/{id?}"); }); }运行代码，会在debug文件下生成日志文件。
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