using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace CrossDomainAccess.WebAPI.Models
{
 public class UserInfo
 {
  public int Id { get; set; }

  public string UserName { get; set; }

  public string UserPass { get; set; }

  public string Email { get; set; }

  public DateTime RegTime { get; set; }
 }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using CrossDomainAccess.WebAPI.Models;

namespace CrossDomainAccess.WebAPI.Controllers
{
 public class UserInfoController : ApiController
 {
  /// <summary>
  /// 获取用户信息集合的方法
  /// </summary>
  /// <returns>返回用户信息集合</returns>
  public IHttpActionResult GetList()
  {
   //对象集合模拟数据
   List<UserInfo> list = new List<UserInfo>()
   {
    new UserInfo()
    {
     Id = 1,
     UserName = "张三",
     UserPass = "FDASDFAS",
     Email = "zhangsan@163.com",
     RegTime = DateTime.Now
    },
    new UserInfo()
    {
     Id = 2,
     UserName = "李四",
     UserPass = "FDASDFAS",
     Email = "lisi@163.com",
     RegTime = DateTime.Now
    },
    new UserInfo()
    {
     Id = 3,
     UserName = "王五",
     UserPass = "FDASDFAS",
     Email = "wangwu@163.com",
     RegTime = DateTime.Now
    },
    new UserInfo()
    {
     Id = 4,
     UserName = "赵六",
     UserPass = "FDASDFAS",
     Email = "zhaoliu@163.com",
     RegTime = DateTime.Now
    },
    new UserInfo()
    {
     Id = 5,
     UserName = "田七",
     UserPass = "FDASDFAS",
     Email = "tianqi@163.com",
     RegTime = DateTime.Now
    },
    new UserInfo()
    {
     Id = 6,
     UserName = "王八",
     UserPass = "FDASDFAS",
     Email = "wangba@163.com",
     RegTime = DateTime.Now
    }
   };
   return Ok(list);
  }
 }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Formatting;
using System.Web.Http;

namespace CrossDomainAccess.WebAPI
{
 public static class WebApiConfig
 {
  public static void Register(HttpConfiguration config)
  {
   // Web API 配置和服务

   // Web API 路由
   config.MapHttpAttributeRoutes();

   config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{action}/{id}",
    defaults: new { id = RouteParameter.Optional }
   );
   //清除所有序列化格式
   config.Formatters.Clear();
   //添加Json格式的序列化器
   config.Formatters.Add(new JsonMediaTypeFormatter());
  }
 }
}