使用NLog给Asp.Net Core做请求监控的方法_实用技巧_

 public class DelegatingHandler1 : DelegatingHandler { protected override async Task SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { Trace.WriteLine("DelegatingHandler1 HashCode: " + this.GetHashCode()); Trace.WriteLine("DelegatingHandler1 base InnerHandler HashCode: " + base.InnerHandler.GetHashCode()); Trace.WriteLine("DelegatingHandler1 start"); var response = await base.SendAsync(request, cancellationToken); Trace.WriteLine("DelegatingHandler1 end"); return response; } } public class DelegatingHandler2 : DelegatingHandler { protected override async Task SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { Trace.WriteLine("DelegatingHandler2 HashCode: " + this.GetHashCode()); Trace.WriteLine("DelegatingHandler2 base InnerHandler HashCode: " + base.InnerHandler.GetHashCode()); Trace.WriteLine("DelegatingHandler2 start"); var response = await base.SendAsync(request, cancellationToken); Trace.WriteLine("DelegatingHandler2 end"); return response; } } public class DelegatingHandler3 : DelegatingHandler { protected override async Task SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { Trace.WriteLine("DelegatingHandler3 HashCode: " + this.GetHashCode()); Trace.WriteLine("DelegatingHandler3 base InnerHandler HashCode: " + base.InnerHandler.GetHashCode()); Trace.WriteLine("DelegatingHandler3 start"); var response = await base.SendAsync(request, cancellationToken); Trace.WriteLine("DelegatingHandler3 end"); return response; } }

 public class WebApiApplication : System.Web.HttpApplication { protected void Application_Start() { AreaRegistration.RegisterAllAreas(); GlobalConfiguration.Configure(WebApiConfig.Register); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); GlobalConfiguration.Configuration.MessageHandlers.Add(new DelegatingHandler1()); GlobalConfiguration.Configuration.MessageHandlers.Add(new DelegatingHandler2()); GlobalConfiguration.Configuration.MessageHandlers.Add(new DelegatingHandler3()); } }

 public class ValuesController : ApiController { // GET api/values public IEnumerable Get() { Trace.WriteLine("/api/values"); var handlers = this.RequestContext.Configuration.MessageHandlers; return new string[] { "value1", "value2" }; } }

 public class ApplicationInsight : DelegatingHandler { protected override async Task SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { var stopWatch = new Stopwatch(); stopWatch.Start(); var response = await base.SendAsync(request, cancellationToken); stopWatch.Stop(); //停止计时器，并记录 } } public partial class Startup { public void Configuration(IAppBuilder app) { GlobalConfiguration.Configuration.MessageHandlers.Add(new ApplicationInsight()); } }

 public void Configure(IApplicationBuilder app, IHostingEnvironment env) { //省略了其他配置 //全局的 HttpContext app.UseGlobalHttpContext(); //省略了其他配置 LogManager.Configuration = new XmlLoggingConfiguration(Path.Combine(env.ContentRootPath, "nlog.config")); LogManager.Configuration.Variables["root"] = env.ContentRootPath; LogManager.Configuration.Variables["connectionString"] = Configuration.GetConnectionString("DefaultConnection"); }

 [LayoutRenderer("apiinsight-start")] public class StartApiInsightRenderer : LayoutRenderer { protected override void Append(StringBuilder builder, LogEventInfo logEvent) { var httpContext = HttpContextProvider.Current; if (httpContext == null) { return; } var _apiInsightsKeys = httpContext.RequestServices.GetService(); if (httpContext != null) { if (httpContext.Items.TryGetValue(_apiInsightsKeys.StartTimeName, out var start) == true) { builder.Append(start.ToString()); } } } }

 public class ApiInsightMiddleware { private readonly RequestDelegate _next; private readonly IServiceProvider _serverProvider; private readonly IApiInsightsKeys _apiInsightsKeys; private readonly ILogger _logger; private HttpContext _httpContext; public ApiInsightMiddleware(RequestDelegate next, IServiceProvider serviceProvider, ILogger logger) { _next = next; _serverProvider = serviceProvider; _apiInsightsKeys = _serverProvider.GetService(); _logger = logger; } public async Task Invoke(HttpContext httpContext) { _httpContext = httpContext; var flag = SetValues(); await _next(httpContext); if (flag == true) { ApiInsight(); } } //省略了其他的代码 }

 public static class HttpContextProvider { private static IHttpContextAccessor _accessor; private static IServiceScopeFactory _serviceScopeFactory; public static Microsoft.AspNetCore.Http.HttpContext Current { get { var context = _accessor?.HttpContext; if (context != null) { var replacementFeature = new RequestServicesFeature(_serviceScop
                
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