没时间解释了，快上车。

通过NuGet获取Zaabee.AspNetCoreProtobuf

Install-Package Zaabee.AspNetCoreProtobuf

在Startup.cs文件中修改ConfigureServices方法

public void ConfigureServices(IServiceCollection services){ ???services.AddMvc(options => { options.AddProtobufSupport(); });}

搞掂……这时候你就可以通过application/x-protobuf的content-type来让asp.net core使用protobuf来进行序列化/反序列化。

测试代码

在asp.net core项目中添加以下DTO

[ProtoContract]public class TestDto{ ???[ProtoMember(1)] public Guid Id { get; set; } ???[ProtoMember(2)] public string Name { get; set; } ???[ProtoMember(3)] public DateTime CreateTime { get; set; } ???[ProtoMember(4)] public List<TestDto> Kids { get; set; } ???[ProtoMember(5)] public long Tag { get; set; } ???[ProtoMember(6)] public TestEnum Enum { get; set; }}public enum TestEnum{ ???Apple, ???Banana, ???Pear}

新建一个XUnit项目，通过Nuget引用Microsoft.AspNetCore.TestHost，建立一个测试类

public class AspNetCoreProtobufTest{ ???private readonly TestServer _server; ???private readonly HttpClient _client; ???public AspNetCoreProtobufTest() ???{ ???????_server = new TestServer( ???????????new WebHostBuilder() ???????????????.UseKestrel() ???????????????.UseStartup<Startup>()); ???????_client = _server.CreateClient(); ???} ???[Fact] ???public void Test() ???{ ???????// HTTP Post with Protobuf Response Body ???????_client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-protobuf")); ???????var dtos = GetDtos(); ???????var stream = new MemoryStream(); ???????ProtoBuf.Serializer.Serialize(stream, dtos); ???????HttpContent httpContent = new StreamContent(stream); ???????// HTTP POST with Protobuf Request Body ???????var responseForPost = _client.PostAsync("api/Values", httpContent); ???????var result = ProtoBuf.Serializer.Deserialize<List<TestDto>>( ???????????responseForPost.Result.Content.ReadAsStreamAsync().Result); ???????Assert.True(CompareDtos(dtos,result)); ???} ???private static bool CompareDtos(List<TestDto> lstOne, List<TestDto> lstTwo) ???{ ???????lstOne = lstOne ?? new List<TestDto>(); ???????lstTwo = lstTwo ?? new List<TestDto>(); ???????if (lstOne.Count != lstTwo.Count) return false; ???????for (var i = 0; i < lstOne.Count; i++) ???????{ ???????????var dtoOne = lstOne[i]; ???????????var dtoTwo = lstTwo[i]; ???????????if (dtoOne.Id != dtoTwo.Id || dtoOne.CreateTime != dtoTwo.CreateTime || dtoOne.Enum != dtoTwo.Enum || ???????????????dtoOne.Name != dtoTwo.Name || dtoOne.Tag != dtoTwo.Tag || !CompareDtos(dtoOne.Kids, dtoTwo.Kids)) ???????????????return false; ???????} ???????return true; ???} ???private static List<TestDto> GetDtos() ???{ ???????return new List<TestDto> ???????{ ???????????new TestDto ???????????{ ???????????????Id = Guid.NewGuid(), ???????????????Tag = long.MaxValue, ???????????????CreateTime = DateTime.Now, ???????????????Name = "0", ???????????????Enum = TestEnum.Apple, ???????????????Kids = new List<TestDto> ???????????????{ ???????????????????new TestDto ???????????????????{ ???????????????????????Id = Guid.NewGuid(), ???????????????????????Tag = long.MaxValue - 1, ???????????????????????CreateTime = DateTime.Now, ???????????????????????Name = "00", ???????????????????????Enum = TestEnum.Banana ???????????????????}, ???????????????????new TestDto ???????????????????{ ???????????????????????Id = Guid.NewGuid(), ???????????????????????Tag = long.MaxValue - 2, ???????????????????????CreateTime = DateTime.Now, ???????????????????????Name = "01", ???????????????????????Enum = TestEnum.Pear ???????????????????} ???????????????} ???????????}, ???????????new TestDto ???????????{ ???????????????Id = Guid.NewGuid(), ???????????????Tag = long.MaxValue - 3, ???????????????CreateTime = DateTime.Now, ???????????????Name = "1", ???????????????Enum = TestEnum.Apple, ???????????????Kids = new List<TestDto> ???????????????{ ???????????????????new TestDto ???????????????????{ ???????????????????????Id = Guid.NewGuid(), ???????????????????????Tag = long.MaxValue - 4, ???????????????????????CreateTime = DateTime.Now, ???????????????????????Name = "10", ????????????????https://i.cnblogs.com/EditCategories.aspx?catid=1 ??????Enum = TestEnum.Banana ???????????????????}, ???????????????????new TestDto ???????????????????{ ???????????????????????Id = Guid.NewGuid(), ???????????????????????Tag = long.MaxValue - 5, ???????????????????????CreateTime = DateTime.Now, ???????????????????????Name = "11", ???????????????????????Enum = TestEnum.Pear ???????????????????} ???????????????} ???????????} ???????}; ???}}

为什么要用protobuf？

因为快……在我们这边使用业务数据的测试中，protobuf的序列化/反序列化性能大概是Json.net的三倍，序列化后的体积大概只有Json的二分之一，这可以在相当程度上提高webapi的吞吐性能。

protobuf的缺点

DTO层必须引用protobuf-net来添加特性，这在一定程度上导致了代码的侵入。基本上DTO属于POCO，依赖第三方包的话总觉得有点不贞洁……另外就是protobuf序列化后的数据不具有可视化，因此如果是使用消息队列或者请求监控的地方，就要综合考虑protobuf是否适合使用场景。

原理

asp.net core是基于中间件方式来实现，其自带默认的JsonFormater（基于Json.net），asp.net core会根据content type来选择对应的Formater来处理对象的序列化，当中包括InputFormatter（反序列化）和OutputFormatter（序列化）。因此除了protobuf，我们还可以添加或者替换其它的序列化方式，例如使用Jil来代替Json.net来提高Json性能。

以上实现以及Demo和测试的源代码已放到GitHub上。

最后给大家拜个晚年，祝大家新年快乐~