WebApi 自定义过滤器实现支持AJAX跨域的请求

我想关于此类话题的文章，大家一搜铺天盖地都是，我写此文的目的，只是对自己学习过程的记录，能对需要的朋友有所帮助，也百感荣幸！！！废话不多说，直接上代码！

客户端：很简单的AJAX请求

<html>
<head>
   <title id='Description'>WebApi支持Ajax跨域</title>
  <script src="js/jquery-1.11.1.min.js"></script>
    <script type="text/javascript">
        $(function () {

            $.ajax({
                type: "POST",
                url: "https://192.168.1.9/api/values/get",
          
                success: function (persons) {
                    
                    alert('persons');

                },
                error: function () {
                    alert('fail');
                }
            });


        });
</script>
</head>
<body class='default'>
 </body>
</html>

WebApi服务端：

1.自定义EnableCorsAttribute类，继承于System.Web.Http.Filters.ActionFilterAttribute ，重写OnActionExecuted方法如下

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

namespace ResourceServer
{
    public class EnableCorsAttribute : System.Web.Http.Filters.ActionFilterAttribute
    {

       public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
            if (!actionExecutedContext.Response.Headers.Contains("Access-Control-Allow-Origin"))
            {
                actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Origin", "*");
            }
            if (!actionExecutedContext.Response.Headers.Contains("Access-Control-Allow-Headers"))
            {
                actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Headers", "Content-Type,Accept");
            }
            if (!actionExecutedContext.Response.Headers.Contains("Access-Control-Allow-Methods"))
            {
                actionExecutedContext.Response.Headers.Add("Access-Control-Allow-Methods", "GET,POST");
            }
         }
    }
}

2.上一部完成后，也已经大功告成，此步直接在想支持跨域Controller的Action的方法上添加标记，就能实现AJAX的跨域调用了。：）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.OData;
using Newtonsoft.Json;
using WebApiThrottle;

namespace ResourceServer.Controllers
{
    public class People {
        public string Name { get; set; }
        public int Age { get; set; }
    
    
    
    }
    
    public class ValuesController : ApiController
    {


        public static List<People> li = new List<People>{
        
        new People{ Name="李刚", Age=19},
        new People{ Name="王六", Age=20}

        
        };
        // GET api/<controller>
        [EnableCors]//此特性添加就支持跨域访问了
        [HttpPost]
        [HttpGet]
        [EnableQuery()]
        [EnableThrottling(PerMinute=5)]
        public List<People> Get()
        {
            return li;
        }

    }
}