支持Ajax跨域访问ASP.NET Web Api 2(Cors)的示例教程

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
   ListUserInfo> list = new ListUserInfo>()
   {
    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());
  }
 }
}

%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="CrossDomainAccess.Web.Index" %>

!DOCTYPE html>

html xmlns="http://www.w3.org/1999/xhtml">
head runat="server">
 meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 title>/title>
 script src="Scripts/jquery-2.2.3.min.js">/script>
 script type="text/javascript">
  $(function () {
   $('#getData').click(function () {
    $.ajax({
     url: 'http://localhost:29867/api/UserInfo/getlist',
     dataType: 'json',
     success: function (data) {
      //以表格的形式在浏览器控制台显示数据,IE下不支持
      console.table(data);
     }
    });
   });
  });
 /script>
/head>
body>
 form id="form1" runat="server">
  div>
   input type="button" value="跨域获取数据" id="getData" />
  /div>
 /form>
/body>
/html>

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

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

  /// summary>
  /// 允许跨域调用
  /// /summary>
  /// param name="config">/param>
  private static void EnableCrossSiteRequests(HttpConfiguration config)
  {
   //对所有的请求来源没有任何限制
   var cors = new EnableCorsAttribute(
    origins: "*",
    headers: "*",
    methods: "*"
    );
   config.EnableCors(cors);
  }
 }
}