无效的ModelState，发送给C＃Web API控制器的JSON数组的HTTP 400错误请求

Question

在C＃Web API中，我试图接受包含JSON数组的POST请求。 我想将JSON数组反序列ILIST RegisterBindingModel类对象的LIST或ILIST 。 然后，在控制器动作中，我将遍历列表并执行所需的动作。

我基本上在Visual Studio 2015中使用库存ASP.NET 5 Web应用程序模板。我在Account控制器上添加了RegisterList方法。

另外，我在C＃控制台应用程序中创建了一个Web客户端。 客户端发送包含JSON数组的POST请求。

我得到的响应始终是400-错误请求。

我是否应该在RegisterList方法签名中将JSON数组反序列化为ILIST或LIST？ 我尝试使用JsonConverter.DeserializeObject ，但是IntelliSenese说the type name DeserializeObject does not exist in type JsonConverter 。

使用Visual Studio模板生成的API文档表明客户端的JSON数组格式正确。

以下是RegisterList方法的代码：

        // POST api/Account/RegisterList
    [AllowAnonymous]
    [Route("RegisterList")]
    public async Task<IHttpActionResult> RegisterList(List<RegisterBindingModel> modelList)
    {
        if (!ModelState.IsValid)
        {
            return BadRequest(ModelState);
        }

        foreach (RegisterBindingModel model in modelList)
        {
            var user = new ApplicationUser() { UserName = model.Email, Email = model.Email };

            IdentityResult result = await UserManager.CreateAsync(user, model.Password);

            if (!result.Succeeded)
            {
                return GetErrorResult(result);
            }

        }
        return Ok();
    }

以下是客户端的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net.Http.Headers;
using Web_Client_Register_Account;
using Newtonsoft.Json;

namespace Web_Client_Register_Account
{
class Program
{
    static void Main(string[] args)
    {
        RunAsync().Wait();
    }

    static async Task RunAsync()
    {
        using (var client = new HttpClient())
        {
            Console.WriteLine("Hit any key");
            Console.ReadLine();
            client.BaseAddress = new Uri("http://localhost:9000/");
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));





            var registrations = new List<Registration> { new Registration { Email = "orc@coast2coast.net", Password = "Secrets1!", ConfirmPassword = "Secrets1!" }, new Registration { Email = "gargoyle@coast2coast.net", Password = "Secrets1!", ConfirmPassword = "Secrets1!" }, new Registration { Email = "elf@coast2coast.net", Password = "Secrets1!", ConfirmPassword = "Secrets1!" }, new Registration { Email = "ranger@coast2coast.net", Password = "Secrets1!", ConfirmPassword = "Secrets1!" } };

    //HTTP Post - A JSON List in a Single POST

            var registration_manifest = JsonConvert.SerializeObject(registrations);

            Console.ReadLine();

                HttpResponseMessage response = await client.PostAsJsonAsync("api/Account/RegisterList", registration_manifest);


                if (response.IsSuccessStatusCode)
                {
                    Uri registrantUrl = response.Headers.Location;
                    Console.WriteLine(registrantUrl);
                    Console.ReadLine();
                }
                Console.WriteLine(response);
                Console.ReadLine();
        }
    }
}
}

Answer 1

HttpClient.PostAsJsonAsync已经编码为JSON，因此跳过JsonConvert.SerializeObject并仅

HttpResponseMessage response = await client.PostAsJsonAsync("api/Account/RegisterList", 
                                                            registrations);