如何在ASP.NET MVC中处理“ OPTIONS方法”

如何在ASP.NET MVC中处理“ OPTIONS方法”

原来我必须创建一个

ActionFilterAttribute

namespace WebService.Attributes{    public class AllowCrossSiteJsonAttribute : ActionFilterAttribute    {        public override void onActionExecuting(ActionExecutingContext filterContext)        { HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); HttpContext.Current.Response.Cache.SetNoStore(); filterContext.RequestContext.HttpContext.Response.AppendHeader("Access-Control-Allow-Origin", "*"); string rqstMethod = HttpContext.Current.Request.Headers["Access-Control-Request-Method"]; if (rqstMethod == "OPTIONS" || rqstMethod == "POST") {     filterContext.RequestContext.HttpContext.Response.AppendHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");     filterContext.RequestContext.HttpContext.Response.AppendHeader("Access-Control-Allow-Headers", "X-Requested-With, Accept, Access-Control-Allow-Origin, Content-Type"); } base.onActionExecuting(filterContext);        }    }}