first commit

MyNewProjectName.WebAPI/Controllers/BaseApiController.cs

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+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MyNewProjectName.WebAPI.Controllers;
+
+/// <summary>
+/// Base API controller with common functionality
+/// </summary>
+[ApiController]
+[Route("api/[controller]")]
+public abstract class BaseApiController : ControllerBase
+{
+    private ISender? _mediator;
+
+    protected ISender Mediator => _mediator ??= HttpContext.RequestServices.GetRequiredService<ISender>();
+}

MyNewProjectName.WebAPI/Controllers/SamplesController.cs

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+using MyNewProjectName.Application.Features.Sample.Commands.CreateSample;
+using MyNewProjectName.Application.Features.Sample.Queries.GetSamples;
+using MyNewProjectName.Contracts.DTOs.Requests;
+using MyNewProjectName.Contracts.DTOs.Responses;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MyNewProjectName.WebAPI.Controllers;
+
+/// <summary>
+/// Sample controller to demonstrate CQRS pattern
+/// </summary>
+public class SamplesController : BaseApiController
+{
+    /// <summary>
+    /// Get all samples
+    /// </summary>
+    [HttpGet]
+    [ProducesResponseType(typeof(ApiResponse<List<SampleResponse>>), StatusCodes.Status200OK)]
+    public async Task<IActionResult> GetAll()
+    {
+        var result = await Mediator.Send(new GetSamplesQuery());
+        return Ok(ApiResponse<List<SampleDto>>.SuccessResponse(result));
+    }
+
+    /// <summary>
+    /// Create a new sample
+    /// </summary>
+    [HttpPost]
+    [ProducesResponseType(typeof(ApiResponse<Guid>), StatusCodes.Status201Created)]
+    [ProducesResponseType(typeof(ApiResponse), StatusCodes.Status400BadRequest)]
+    public async Task<IActionResult> Create([FromBody] CreateSampleRequest request)
+    {
+        var command = new CreateSampleCommand(request.Name, request.Description);
+        var id = await Mediator.Send(command);
+        return CreatedAtAction(nameof(GetAll), new { id }, ApiResponse<Guid>.SuccessResponse(id, "Sample created successfully"));
+    }
+}

MyNewProjectName.WebAPI/Middleware/CorrelationIdMiddleware.cs

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+using Serilog.Context;
+
+namespace MyNewProjectName.WebAPI.Middleware;
+
+/// <summary>
+/// Middleware to generate and track correlation ID for each request
+/// This ID is added to HTTP headers and Serilog log context for easy tracing
+/// </summary>
+public class CorrelationIdMiddleware
+{
+    private readonly RequestDelegate _next;
+    private const string CorrelationIdHeaderName = "X-Correlation-ID";
+    private const string CorrelationIdLogPropertyName = "CorrelationId";
+
+    public CorrelationIdMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        // Get correlation ID from request header, or generate a new one
+        var correlationId = context.Request.Headers[CorrelationIdHeaderName].FirstOrDefault()
+            ?? $"req-{Guid.NewGuid():N}";
+
+        // Add correlation ID to response header
+        context.Response.Headers[CorrelationIdHeaderName] = correlationId;
+
+        // Add correlation ID to Serilog log context
+        // All logs within this request will automatically include this correlation ID
+        using (LogContext.PushProperty(CorrelationIdLogPropertyName, correlationId))
+        {
+            await _next(context);
+        }
+    }
+}

MyNewProjectName.WebAPI/Middleware/ExceptionHandlingMiddleware.cs

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+using System.Net;
+using System.Text.Json;
+using MyNewProjectName.Contracts.DTOs.Responses;
+using MyNewProjectName.Domain.Exceptions;
+using Serilog;
+
+namespace MyNewProjectName.WebAPI.Middleware;
+
+/// <summary>
+/// Global exception handling middleware
+/// Catches all unhandled exceptions, logs them to Serilog with full details,
+/// and returns a standardized error response without exposing stack traces
+/// </summary>
+public class ExceptionHandlingMiddleware
+{
+    private readonly RequestDelegate _next;
+    private readonly Serilog.ILogger _logger;
+
+    public ExceptionHandlingMiddleware(RequestDelegate next, Serilog.ILogger logger)
+    {
+        _next = next;
+        _logger = logger;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await _next(context);
+        }
+        catch (Exception ex)
+        {
+            await HandleExceptionAsync(context, ex);
+        }
+    }
+
+    private async Task HandleExceptionAsync(HttpContext context, Exception exception)
+    {
+        // Get correlation ID from header (set by CorrelationIdMiddleware)
+        var correlationId = context.Request.Headers["X-Correlation-ID"].FirstOrDefault() ?? "unknown";
+
+        // Log full exception details to Serilog (including stack trace)
+        // This will be searchable by CorrelationId
+        _logger.Error(
+            exception,
+            "Unhandled exception occurred. CorrelationId: {CorrelationId}, Path: {Path}, Method: {Method}",
+            correlationId,
+            context.Request.Path,
+            context.Request.Method
+        );
+
+        // Safety check: If response has already started, we cannot modify headers/status code
+        // This prevents InvalidOperationException: "Headers are read-only, response has already started"
+        if (context.Response.HasStarted)
+        {
+            _logger.Warning(
+                "Response has already started. Cannot modify HTTP status code or headers. CorrelationId: {CorrelationId}",
+                correlationId
+            );
+            return;
+        }
+
+        var response = context.Response;
+        
+        // Clear any existing response data
+        response.Clear();
+        
+        response.ContentType = "application/json";
+
+        // Determine status code and user-friendly message
+        var (statusCode, message, errors) = exception switch
+        {
+            ValidationException validationEx => (
+                HttpStatusCode.BadRequest,
+                "Validation failed",
+                validationEx.Errors.SelectMany(e => e.Value).ToList()),
+
+            NotFoundException => (
+                HttpStatusCode.NotFound,
+                exception.Message,
+                new List<string>()),
+
+            DomainException => (
+                HttpStatusCode.BadRequest,
+                exception.Message,
+                new List<string>()),
+
+            UnauthorizedAccessException => (
+                HttpStatusCode.Unauthorized,
+                "Unauthorized",
+                new List<string>()),
+
+            _ => (
+                HttpStatusCode.InternalServerError,
+                "An error occurred while processing your request",
+                new List<string>())
+        };
+
+        response.StatusCode = (int)statusCode;
+
+        // Return standardized error response (NO stack trace exposed to client)
+        var result = JsonSerializer.Serialize(new ApiResponse
+        {
+            Success = false,
+            Message = message,
+            Errors = errors.Any() ? errors : null
+        }, new JsonSerializerOptions
+        {
+            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+        });
+
+        await response.WriteAsync(result);
+    }
+}

MyNewProjectName.WebAPI/Middleware/RequestResponseLoggingMiddleware.cs

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+using System.Diagnostics;
+using System.Text;
+using Microsoft.Extensions.Configuration;
+using Serilog;
+
+namespace MyNewProjectName.WebAPI.Middleware;
+
+/// <summary>
+/// Middleware to log request and response bodies
+/// WARNING: This can generate large log files. Use with caution in production.
+/// Consider enabling only for specific environments or endpoints.
+/// </summary>
+public class RequestResponseLoggingMiddleware
+{
+    private readonly RequestDelegate _next;
+    private readonly Serilog.ILogger _logger;
+    private readonly bool _enableRequestLogging;
+    private readonly bool _enableResponseLogging;
+
+    // Paths that should NOT be logged (e.g., health checks, metrics)
+    private static readonly string[] ExcludedPaths = new[]
+    {
+        "/health",
+        "/metrics",
+        "/favicon.ico"
+    };
+
+    public RequestResponseLoggingMiddleware(
+        RequestDelegate next,
+        Serilog.ILogger logger,
+        IConfiguration configuration)
+    {
+        _next = next;
+        _logger = logger;
+        _enableRequestLogging = configuration.GetValue<bool>("Logging:EnableRequestLogging", false);
+        _enableResponseLogging = configuration.GetValue<bool>("Logging:EnableResponseLogging", false);
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        // Skip logging for excluded paths
+        if (ExcludedPaths.Any(path => context.Request.Path.StartsWithSegments(path)))
+        {
+            await _next(context);
+            return;
+        }
+
+        var stopwatch = Stopwatch.StartNew();
+        var requestBody = string.Empty;
+        var responseBody = string.Empty;
+
+        // Log request
+        if (_enableRequestLogging)
+        {
+            requestBody = await ReadRequestBodyAsync(context.Request);
+            _logger.Information(
+                "Request: {Method} {Path} {QueryString} | Body: {RequestBody}",
+                context.Request.Method,
+                context.Request.Path,
+                context.Request.QueryString,
+                requestBody
+            );
+        }
+
+        // Capture response body
+        var originalBodyStream = context.Response.Body;
+        using var responseBodyStream = new MemoryStream();
+        context.Response.Body = responseBodyStream;
+
+        try
+        {
+            await _next(context);
+        }
+        finally
+        {
+            stopwatch.Stop();
+
+            // Log response
+            if (_enableResponseLogging)
+            {
+                responseBody = await ReadResponseBodyAsync(context.Response);
+                await responseBodyStream.CopyToAsync(originalBodyStream);
+
+                _logger.Information(
+                    "Response: {StatusCode} | Duration: {Duration}ms | Body: {ResponseBody}",
+                    context.Response.StatusCode,
+                    stopwatch.ElapsedMilliseconds,
+                    responseBody
+                );
+            }
+            else
+            {
+                await responseBodyStream.CopyToAsync(originalBodyStream);
+            }
+
+            context.Response.Body = originalBodyStream;
+        }
+    }
+
+    private static async Task<string> ReadRequestBodyAsync(HttpRequest request)
+    {
+        // Enable buffering to allow reading the body multiple times
+        request.EnableBuffering();
+
+        using var reader = new StreamReader(
+            request.Body,
+            encoding: Encoding.UTF8,
+            detectEncodingFromByteOrderMarks: false,
+            leaveOpen: true);
+
+        var body = await reader.ReadToEndAsync();
+        request.Body.Position = 0; // Reset position for next middleware
+
+        // Truncate very long bodies to avoid huge logs
+        return body.Length > 10000 ? body[..10000] + "... (truncated)" : body;
+    }
+
+    private static async Task<string> ReadResponseBodyAsync(HttpResponse response)
+    {
+        response.Body.Seek(0, SeekOrigin.Begin);
+        using var reader = new StreamReader(
+            response.Body,
+            encoding: Encoding.UTF8,
+            detectEncodingFromByteOrderMarks: false,
+            leaveOpen: true);
+
+        var body = await reader.ReadToEndAsync();
+        response.Body.Seek(0, SeekOrigin.Begin); // Reset position
+
+        // Truncate very long bodies to avoid huge logs
+        return body.Length > 10000 ? body[..10000] + "... (truncated)" : body;
+    }
+}

MyNewProjectName.WebAPI/MyNewProjectName.WebAPI.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.0" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="7.2.0" />
+    <!-- Serilog for structured logging -->
+    <PackageReference Include="Serilog.AspNetCore" Version="8.0.3" />
+    <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
+    <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
+    <PackageReference Include="Serilog.Sinks.Seq" Version="8.0.0" />
+    <PackageReference Include="Serilog.Enrichers.Environment" Version="3.0.1" />
+    <PackageReference Include="Serilog.Enrichers.Thread" Version="4.0.0" />
+    <!-- OpenTelemetry for distributed tracing -->
+    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.EntityFrameworkCore" Version="1.0.0-beta.7" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MyNewProjectName.Infrastructure\MyNewProjectName.Infrastructure.csproj" />
+    <ProjectReference Include="..\MyNewProjectName.Application\MyNewProjectName.Application.csproj" />
+    <ProjectReference Include="..\MyNewProjectName.Contracts\MyNewProjectName.Contracts.csproj" />
+  </ItemGroup>
+
+</Project>

MyNewProjectName.WebAPI/MyNewProjectName.WebAPI.http

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+@MyNewProjectName.WebAPI_HostAddress = http://localhost:5044
+
+GET {{MyNewProjectName.WebAPI_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

MyNewProjectName.WebAPI/Program.cs

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+using Microsoft.Extensions.Hosting;
+using MyNewProjectName.Application;
+using MyNewProjectName.Infrastructure;
+using MyNewProjectName.Infrastructure.Extensions;
+using MyNewProjectName.WebAPI.Middleware;
+using Serilog;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Configure Serilog
+builder.Host.UseSerilogLogging(builder.Configuration);
+
+// Add OpenTelemetry distributed tracing
+builder.Services.AddOpenTelemetryTracing("MyNewProjectName.WebAPI");
+
+// Add services to the container.
+builder.Services.AddControllers();
+
+// Add Application Layer
+builder.Services.AddApplication();
+
+// Add Infrastructure Layer
+builder.Services.AddInfrastructure(builder.Configuration);
+
+// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
+builder.Services.AddOpenApi();
+
+// Add Swagger
+builder.Services.AddEndpointsApiExplorer();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
+
+// Middleware pipeline order is critical:
+// 1. CorrelationIdMiddleware - Must be first to track all requests
+app.UseMiddleware<CorrelationIdMiddleware>();
+
+// 2. RequestResponseLoggingMiddleware - Optional, enable only when needed
+// WARNING: This can generate large log files. Enable only for specific environments.
+// Configure in appsettings.json: "Logging:EnableRequestLogging" and "Logging:EnableResponseLogging"
+app.UseMiddleware<RequestResponseLoggingMiddleware>();
+
+app.UseHttpsRedirection();
+
+// 3. Authentication (built-in)
+app.UseAuthentication();
+
+// 4. Authorization (built-in)
+app.UseAuthorization();
+
+// 6. ExceptionHandlingMiddleware - Must be last to catch all exceptions
+app.UseMiddleware<ExceptionHandlingMiddleware>();
+
+app.MapControllers();
+
+try
+{
+    Log.Information("Starting MyNewProjectName.WebAPI");
+    app.Run();
+}
+catch (Exception ex)
+{
+    Log.Fatal(ex, "Application terminated unexpectedly");
+    throw;
+}
+finally
+{
+    Log.CloseAndFlush();
+}
+

MyNewProjectName.WebAPI/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5044",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "https://localhost:7285;http://localhost:5044",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

MyNewProjectName.WebAPI/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

MyNewProjectName.WebAPI/appsettings.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=localhost;Database=MyNewProjectNameDb;Trusted_Connection=True;MultipleActiveResultSets=true;TrustServerCertificate=True"
+  },
+  "Jwt": {
+    "SecretKey": "YourSuperSecretKeyThatIsAtLeast32CharactersLong!",
+    "Issuer": "MyNewProjectName",
+    "Audience": "MyNewProjectName",
+    "ExpirationInMinutes": 60,
+    "RefreshTokenExpirationInDays": 7
+  },
+  "Redis": {
+    "ConnectionString": "localhost:6379",
+    "InstanceName": "MyNewProjectName:",
+    "DefaultExpirationInMinutes": 30
+  },
+  "Serilog": {
+    "MinimumLevel": "Information",
+    "Override": {
+      "Microsoft": "Warning",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning",
+      "System": "Warning"
+    },
+    "WriteToConsole": true,
+    "WriteToFile": true,
+    "FilePath": "logs/log-.txt",
+    "RollingInterval": "Day",
+    "RetainedFileCountLimit": 31,
+    "SeqUrl": null,
+    "ElasticsearchUrl": null
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "Warning"
+    },
+    "EnableRequestLogging": false,
+    "EnableResponseLogging": false
+  },
+  "AllowedHosts": "*"
+}