src/Library/NetPro.Serilog/Startup/NetProSerilogStartup.cs

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using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Serilog;
using Serilog.Extensions.Hosting;
using Serilog.Extensions.Logging;
using System.NetPro;

namespace NetPro.SerilogStartup
{
    internal sealed class NetProSerilogStartup : INetProStartup, System.NetPro.Startup.__._
    {
        public double Order { get; set; } = 0;

        public void Configure(IApplicationBuilder application, IWebHostEnvironment env)
        {
            application.UseSerilogRequestLogging();
        }

        public void ConfigureServices(IServiceCollection services, IConfiguration configuration = null, ITypeFinder typeFinder = null)
        {
            Log.Logger = new LoggerConfiguration()
                                .ReadFrom.Configuration(configuration)
                                .CreateLogger();

            // Reference to https://github.com/serilog/serilog-aspnetcore/blob/dev/src/Serilog.AspNetCore/SerilogWebHostBuilderExtensions.cs
            services.AddSingleton<ILoggerFactory>(services => new SerilogLoggerFactory());

            // Registered to provide two services...
            var diagnosticContext = new DiagnosticContext(null);

            // Consumed by e.g. middleware
            services.AddSingleton(diagnosticContext);

            // Consumed by user code
            services.AddSingleton<IDiagnosticContext>(diagnosticContext);
        }
    }
}