.Net Core : Logging system

.Net Core : Logging system

 Log messages in .net core.

Step 1

Create custom logger class 

using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;

namespace CoreDemo.Middleware
{
    public class MyLoggerMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger _logger;

        public MyLoggerMiddleware(RequestDelegate next, ILoggerFactory logFactory)
        {
            _next = next;
            _logger = logFactory.CreateLogger("MyLogger");
        }

        public async Task Invoke(HttpContext httpContext)
        {
            _logger.LogInformation("test log");
            //await _next(httpContext);

            var bodyStream = httpContext.Response.Body;
            var responseBodyStream = new MemoryStream();
            httpContext.Response.Body = responseBodyStream;

            await _next(httpContext);
            responseBodyStream.Seek(0, SeekOrigin.Begin);
            var responseBody = new StreamReader(responseBodyStream).ReadToEnd();

            var responseCode = httpContext.Response.StatusCode;
            var requestPath = httpContext.Request.Path;
            var requestMethod = httpContext.Request.Method;

            _logger.LogInformation($"@timeStamp = {DateTime.Now}, site = {"CoreDemo"}, Level = info, ThreadId = {Thread.CurrentThread.ManagedThreadId}, Message = logger Middleware response {responseBody}, request path = {requestPath}, request method = { requestMethod}");
                
            responseBodyStream.Seek(0, SeekOrigin.Begin);
            await responseBodyStream.CopyToAsync(bodyStream);
        }
    }

    public static class MyLoggerMiddlewareExtension
    {
        public static  IApplicationBuilder UseMyLoggerMiddleware(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<MyLoggerMiddleware>();
        }
    }
}

  

Step 2

startup.cs

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseMyLoggerMiddleware();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            
            app.UseMvc();
        }

Hope this will help you and save your time.

Enjoy !!!

:)