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=},
new People{ Name="王六", Age=} };
// GET api/<controller>
[EnableCors]//此特性添加就支持跨域访问了
[HttpPost]
[HttpGet]
[EnableQuery()]
[EnableThrottling(PerMinute=)]
public List<People> Get()
{
return li;
} }
}