将MailMessage对象发送到WebApi

Question

已要求我使用WebApi 2.1设置服务，该服务将能够接受MailMessage对象作为参数，发送该邮件消息，并记录该邮件已发送。

我已根据Microsoft的以下示例对我的尝试进行了模式化： https://docs.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/bson-support-in-web-api-21

这是我控制器中的动作：

        [HttpPost]
        [Route("api/Email/SendMailMessage")]
        public async Task SendMailMessage(System.Net.Mail.MailMessage msg)
        {
            await _emailSender.SendMailMessageAsync(msg);
        }

这是调用API的测试方法：

        public async void TestMailMessage()
        {
            MailMessage msg = new MailMessage();
            // snip details of msg population for brevity

            using (HttpClient client = new HttpClient())
            {
                client.BaseAddress = new Uri("http://localhost:40353/");

                // Set the Accept header for BSON.
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/bson"));

                // POST using the BSON formatter.
                MediaTypeFormatter bsonFormatter = new BsonMediaTypeFormatter();
                var result = await client.PostAsync("api/Email/SendMailMessage", msg, bsonFormatter);

            }
        }

Startup.cs

    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;

        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            services.AddMvc().AddBsonSerializerFormatters();
            services.Configure<EmailSettings>(Configuration.GetSection("EmailSettings"));
            services.AddTransient<IEmailSender, AuthMessageSender>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
        }
    }

我遇到的问题是MailMessage对象在服务器上作为null传入。

或者，我尝试将对象序列化为字节，但是由于MailMessage类不可序列化，因此失败了。