ASP.NET Core中间件计算Http请求时间示例详解_实用技巧_

 public delegate Task RequestDelegate(HttpContext context);

 public static IApplicationBuilder Use(this IApplicationBuilder app, Func, Task> middleware); public static IApplicationBuilder UseMiddleware(this IApplicationBuilder app, params object[] args);

 public class ResponseTimeMiddleware { // Name of the Response Header, Custom Headers starts with "X-" private const string RESPONSE_HEADER_RESPONSE_TIME = "X-Response-Time-ms"; // Handle to the next Middleware in the pipeline private readonly RequestDelegate _next; public ResponseTimeMiddleware(RequestDelegate next) { _next = next; } public Task InvokeAsync(HttpContext context) { // Start the Timer using Stopwatch var watch = new Stopwatch(); watch.Start(); context.Response.OnStarting(() => { // Stop the timer information and calculate the time watch.Stop(); var responseTimeForCompleteRequest = watch.ElapsedMilliseconds; // Add the Response time information in the Response headers. context.Response.Headers[RESPONSE_HEADER_RESPONSE_TIME] = responseTimeForCompleteRequest.ToString(); return Task.CompletedTask; }); // Call the next delegate/middleware in the pipeline return this._next(context); } }