Writing custom logging middleware

We've seen in the previous section how we can write custom attributes to perform actions before and after a controller action, and, in Chapter 1, Getting Started with ASP.NET Core, how we can write middleware. Now, a simple middleware class to log all requests can be written as follows:

public class LoggingMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILoggerFactory _loggerFactory;

    public LoggingMiddleware(RequestDelegate next, ILoggerFactory 
    loggerFactory)
    {
        this._next = next;
        this._loggerFactory = loggerFactory;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        var logger = this._loggerFactory.CreateLogger<LoggingMiddleware>
        ();
        using (logger.BeginScope<LoggingMiddleware>(this))
        {
            logger.LogInformation("Before request");
            await this._next.Invoke(context);
            logger.LogInformation(&quot...