前言

此为粗略结果，未做完善的缓存和预热操作，仅供参考

创建项目

(1)项目名称
MyBenchmarks

(2)添加引用
<PackageReference Include="AutoMapper" Version="16.0.0" />
<PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
<PackageReference Include="Mapster" Version="7.4.0" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
<PackageReference Include="NLog" Version="6.0.7" />
<PackageReference Include="TinyMapper" Version="3.0.3" />

具体代码

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using Mapster;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Nelibur.ObjectMapper;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.Linq.Expressions;

namespace MyBenchmarks
{
    public class Program
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<MappingBenchmarks>();

            Console.ReadLine();
        }
    }

    [MemoryDiagnoser]
    public class MappingBenchmarks
    {
        private IServiceCollection _services = null;
        private SourceDto _source = null;
        private AutoMapper.IMapper _mapper = null;
        private ILoggerFactory _loggerFactory = null;
        private IsoDateTimeConverter _timeConverter = null;

        [GlobalSetup]
        public void Setup()
        {
            _services = new ServiceCollection();
            _services.AddLogging(builder =>
            {
                builder.SetMinimumLevel(LogLevel.Information);
            });
            var serviceProvider = _services.BuildServiceProvider();
            _loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();

            _source = new SourceDto()
            {
                Id = DateTime.Now.Second,
                Name = DateTime.Now.Second.ToString(),
                CreatedAt = DateTime.Now,
            };

            TinyMapper.Bind<SourceDto, DestDto>();

            var config = new AutoMapper.MapperConfiguration(c => c.CreateMap<SourceDto, DestDto>(), _loggerFactory);
            _mapper = config.CreateMapper();

            _timeConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
        }

        [Benchmark(Baseline = true)]
        public DestDto ManualBuild()
        {
            return new DestDto
            {
                Id = _source.Id,
                Name = _source.Name,
                CreatedAt = _source.CreatedAt,
            };
        }

        [Benchmark]
        public DestDto TinyMapperMap()
        {
            return TinyMapper.Map<DestDto>(_source);
        }

        [Benchmark]
        public DestDto AutoMapperMap()
        {
            return _mapper.Map<DestDto>(_source);
        }

        [Benchmark]
        public DestDto MapsterMap()
        {
            return _source.Adapt<DestDto>();
        }

        [Benchmark]
        public DestDto JsonMap()
        {
            var json = JsonConvert.SerializeObject(_source, _timeConverter);
            return JsonConvert.DeserializeObject<DestDto>(json);
        }

        [Benchmark]
        public DestDto CopyPropertiesMap()
        {
            var target = new DestDto();

            {
                var sourceType = _source.GetType();
                var targetType = target.GetType();
                foreach (var prop in sourceType.GetProperties())
                {
                    var targetProp = targetType.GetProperty(prop.Name);
                    if (targetProp != null && targetProp.PropertyType == prop.PropertyType)
                    {
                        targetProp.SetValue(target, prop.GetValue(_source));
                    }
                }
            }

            return target;
        }

        [Benchmark]
        public DestDto ExpressionGenericMapperMap()
        {
            return ExpressionGenericMapper<SourceDto, DestDto>.Trans(_source);
        }
    }

    public class ExpressionGenericMapper<TInput, TResult>
    {
        private static Func<TInput, TResult> _FUNC;

        static ExpressionGenericMapper()
        {
            ParameterExpression parameterExpression = Expression.Parameter(typeof(TInput), "p");
            List<MemberBinding> memberBindingList = new List<MemberBinding>();
            foreach (var item in typeof(TResult).GetProperties())
            {
                MemberExpression property = Expression.Property(parameterExpression, typeof(TInput).GetProperty(item.Name));
                MemberBinding memberBinding = Expression.Bind(item, property);
                memberBindingList.Add(memberBinding);
            }
            foreach (var item in typeof(TResult).GetFields())
            {
                MemberExpression field = Expression.Field(parameterExpression, typeof(TInput).GetField(item.Name));
                MemberBinding memberBinding = Expression.Bind(item, field);
                memberBindingList.Add(memberBinding);
            }
            MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TResult)), memberBindingList.ToArray());
            Expression<Func<TInput, TResult>> lambda = Expression.Lambda<Func<TInput, TResult>>(memberInitExpression, new ParameterExpression[] {
                parameterExpression
            });
            _FUNC = lambda.Compile();
        }

        public static TResult Trans(TInput t)
        {
            return _FUNC(t);
        }
    }

    public class SourceDto
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public DateTime CreatedAt { get; set; }
    }

    public class DestDto
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public DateTime CreatedAt { get; set; }
    }
}

运行测试

需 Release 模式下运行

以 PowerShell 为例
进入项目目录

运行
dotnet run -c Release --project MyBenchmarks.csproj

运行结果

(1)机器信息

BenchmarkDotNet v0.15.8, Windows 10 (10.0.19045.5737/22H2/2022Update)
13th Gen Intel Core i5-13400F 2.50GHz, 1 CPU, 16 logical and 10 physical cores
.NET SDK 10.0.100
  [Host]     : .NET 8.0.22 (8.0.22, 8.0.2225.52707), X64 RyuJIT x86-64-v3
  DefaultJob : .NET 8.0.22 (8.0.22, 8.0.2225.52707), X64 RyuJIT x86-64-v3

(2)表格