Yaseer Arafat emonarafat

🧠 AutoMapper vs Manual vs Mapster — Real-World Mapping in .NET

This Gist explores three mapping strategies in .NET: AutoMapper, Manual Mapping, and Mapster. Includes benchmarks and testing guidance.

	using System.Text.Json;
	using System.IO.Compression;
	using StackExchange.Redis;
	using System.Text;

	public static class JsonCacheHelper
	{
	private static readonly JsonSerializerOptions _jsonOptions = new()
	{
	PropertyNamingPolicy = JsonNamingPolicy.CamelCase,


	// ITimeProvider.cs
	public interface ITimeProvider
	{
	DateTime UtcNow { get; }
	}

	// SystemTimeProvider.cs
	public class SystemTimeProvider : ITimeProvider
	{


	// Program.cs — Minimal API setup for global rate limiting

	var builder = WebApplication.CreateBuilder(args);

	// Register native ASP.NET Core rate limiter
	builder.Services.AddRateLimiter(options =>
	{
	options.GlobalLimiter = PartitionedRateLimiter.Create<HttpContext, string>(context =>
	RateLimitPartition.GetFixedWindowLimiter(

	// ❌ Misuse of Records in .NET — Don't Do This
	public record User
	{
	public string Name { get; set; }
	public int Age { get; set; }
	}

	// This is mutable — which defeats the purpose of records
	var user = new User { Name = "John", Age = 30 };
	user.Age = 31; // Mutation warning!


	// PolymorphicJsonConverter.cs

	using System.Text.Json;
	using System.Text.Json.Serialization;

	public interface INotification
	{
	string Type { get; }
	}

	using System;
	using System.Collections.Generic;
	using System.Diagnostics;
	using System.Text.Json;
	using Newtonsoft.Json.Linq;
	using Newtonsoft.Json;

	public class JsonSerializerComparison
	{
	public static void Compare(MyModel model)

	// PluginHostExtensions.cs
	public static class PluginHostExtensions
	{
	public static IServiceCollection AddPlugin<TPlugin>(this IServiceCollection services)
	where TPlugin : class, IPlugin, new()
	{
	var plugin = new TPlugin();
	plugin.ConfigureServices(services);
	return services;
	}

	// EFCoreMythSamples.cs
	// Demonstrates tracked vs untracked queries and minimal EF Core usage

	using Microsoft.EntityFrameworkCore;

	public class BloggingContext : DbContext
	{
	public DbSet<Post> Posts => Set<Post>();
	public DbSet<Comment> Comments => Set<Comment>();

	# TaskResultDeadlockExample.cs

	// ❌ Anti-pattern: Mixing sync + async causes deadlocks

	public class UserService
	{
	public string GetUserName(Guid id)
	{
	var client = new HttpClient();
	// This will block the thread and can cause deadlocks in ASP.NET or UI apps