Asp.Net MVC 中實現跨域訪問

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在ASP.Net webapi中可以使用  Microsoft.AspNet.WebApi.Cors  來實現：

public static class WebApiConfig    {        public static void Register(HttpConfiguration config)        {            // New code            config.EnableCors();            config.Routes.MapHttpRoute(                name: "DefaultApi",                routeTemplate: "api/{controller}/{id}",                defaults: new { id = RouteParameter.Optional }            );        }    }

[EnableCors(origins: "http://mywebclient.azurewebsites.net", headers: "*", methods: "*")]    public class TestController : ApiController    {        // Controller methods not shown...    }

但在MVC中不能使用這個，需要自訂一個類：

public class AllowCrossSiteJsonAttribute: ActionFilterAttribute    {        private string[] _domains;        public AllowCrossSiteJsonAttribute(string domain)        {            _domains= new string[] { domain };        }        public AllowCrossSiteJsonAttribute(string[] domains)        {            _domains = domains;        }        public override void OnActionExecuting(ActionExecutingContext filterContext)        {            var context = filterContext.RequestContext.HttpContext;            var host = context.Request.UrlReferrer?.Host;            if (host != null && _domains.Contains(host))            {                filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "*");            }            base.OnActionExecuting(filterContext);        }    }

在被訪問的控制器上加上AllowCrossSiteJson：

[AllowCrossSiteJson("localhost")]        public JsonResult Index()        {            var holidays = new List<Holiday>            {                new Holiday                {                    Title="2 Weeks in Rhodes",                    Price=688,                    ImgUrl="http://media.wiley.com/product_data/coverImage/84/04702927/0470292784.jpg"                },                new Holiday                {                    Title="1 Weeks in Barbados",                    Price=320,                    ImgUrl="http://media.wiley.com/product_data/coverImage/84/04702927/0470292784.jpg"                }            };            return Json(holidays, JsonRequestBehavior.AllowGet);        }

 

Asp.Net MVC 中實現跨域訪問