Object 在 Web API 中使用 POSTMAN 进行模型绑定后为空

Object is null after model binding in Web API, using POSTMAN

我正在尝试学习 Web API 并创建了我的第一个项目,如下所示。我正在使用 postman 对其进行测试。 post 方法工作正常,我收到了响应消息——但控制器收到的 post 操作的输入为空。需要做什么才能在控制器中获取 post 值?

using System.Collections.Generic;
using System.Net.Http;
using System.Web.Http;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class ValuesController : ApiController
    {
        List<Comment> comments;

        // GET api/values
        public IEnumerable<Comment> Get()
        {
            return comments;
        }

        // GET api/values/5
        public Comment Get(int id)
        {
            Comment c = comments[id-1];

            if (string.IsNullOrEmpty(c.Description))
            {
                throw new HttpResponseException(System.Net.HttpStatusCode.NotFound);
            }

            return c;
        }

        // POST api/values
        public HttpResponseMessage Post(Comment inputComment)
        {
            Comment c = new Comment();
            if (inputComment != null)
            {
                c.Description = inputComment.Description;
                c.ID = inputComment.ID;
            }
           //var response = new HttpResponseMessage(HttpStatusCode.Created);
           //return response;

            var response = Request.CreateResponse<Comment>(System.Net.HttpStatusCode.Created, c);
            response.Headers.Location=new System.Uri(Request.RequestUri,"/api/values/"+c.ID.ToString());
            return response;
        }

        // PUT api/values/5
        public void Put(int id, [FromBody]string value)
        {
        }

        // DELETE api/values/5
        public void Delete(int id)
        {
        }

        public ValuesController()
        {
            comments = new List<Comment>();

            Comment comment1 = new Comment();
            comment1.ID = 1;
            comment1.Description = "Test1";

            Comment comment2 = new Comment();
            comment2.ID = 2;
            comment2.Description = "";

            comments.Add(comment1);
            comments.Add(comment2);

        }
    }
}

邮递员[=3​​8=]

POSTMAN 请求Header

更新

在请求body中使用'raw'后,效果很好。在 POSTMAN 中,当我单击 "Generate Code" 时,它现在显示正确的 headers。

使用 Raw 作为主体类型而不是 Form-data 并输入您 JSON。