Analysis ASP.NET Core middleware pipeline

MiddlewareDiagnosticObserver.cs

using System;
using System.Collections.Generic;
using System.Reflection;
using Microsoft.AspNetCore.Http;

public class MiddlewareDiagnosticObserver : IObserver<KeyValuePair<string,object?>>
{
    public void OnCompleted()
    {
        // Do nothing
    }

    public void OnError(Exception error)
    {
        // Do nothing
    }

    public void OnNext(KeyValuePair<string, object?> value)
    {
        // https://github.com/dotnet/aspnetcore/blob/v6.0.0/src/Middleware/MiddlewareAnalysis/src/AnalysisMiddleware.cs
        if (value.Key == "Microsoft.AspNetCore.MiddlewareAnalysis.MiddlewareStarting" && value.Value != null)
        {
            var name = GetPropertyValue<string>(value.Value,"name");
            var httpContext =GetPropertyValue<HttpContext>(value.Value,"httpContext");
            Console.WriteLine($"MiddlewareStarting: {name}; {httpContext.Request.Path}");
        }
        if (value.Key == "Microsoft.AspNetCore.MiddlewareAnalysis.MiddlewareFinished" && value.Value != null)
        {
            var name = GetPropertyValue<string>(value.Value,"name");
            var httpContext =GetPropertyValue<HttpContext>(value.Value,"httpContext");
            Console.WriteLine($"MiddlewareFinished: {name}; {httpContext.Response.StatusCode}");
        }
        if (value.Key == "Microsoft.AspNetCore.MiddlewareAnalysis.MiddlewareException" && value.Value != null)
        {
            var name = GetPropertyValue<string>(value.Value,"name");
            var exception =GetPropertyValue<Exception>(value.Value,"exception");
            Console.WriteLine($"MiddlewareException: {name}; {exception.Message}");
        }
    }
        
    private static T GetPropertyValue<T>(object obj, string propertyName)
    {
        return (T)obj.GetType().GetProperty(propertyName, BindingFlags.Instance | BindingFlags.Public)?.GetValue(obj)!;
    }
}

Program.cs

var builder = WebApplication.CreateBuilder(args);

// dotnet add package Microsoft.AspNetCore.MiddlewareAnalysis
builder.Services.AddMiddlewareAnalysis();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    var diagnosticListener = app.Services.GetRequiredService<DiagnosticListener>();
    diagnosticListener.Subscribe(new MiddlewareDiagnosticObserver());
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

app.MapRazorPages();

app.Run();