.NET 跨域问题

解决方案：

1、针对ASP.NET MVC和ASP.NET Web API两种项目类型，我做了一些研究，确定下面的方案是可行的。

针对ASP.NET MVC，只需要在web.config中添加如下的内容即可

<system.webServer>

<httpProtocol>

<customHeaders>

<add name="Access-Control-Allow-Origin" value="*" />

<add name="Access-Control-Allow-Headers" value="Content-Type" />

<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />

</customHeaders>

</httpProtocol>

<handlers>

<remove name="ExtensionlessUrlHandler-Integrated-4.0" />

<remove name="OPTIONSVerbHandler" />

<remove name="TRACEVerbHandler" />

<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

</handlers>

</system.webServer>

 2、建立Filters，cors

public class CorsAttribute : ActionFilterAttribute, IActionFilter
    {
        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            try
            {
                base.OnResultExecuted(filterContext);
                HttpContext.Current.Response.Headers.Add("Access-Control-Allow-Origin", "*");
                HttpContext.Current.Response.Headers.Add("Access-Control-Allow-Headers", "x-requested-with,content-type,requesttype,Token");
                HttpContext.Current.Response.Headers.Add("Access-Control-Allow-Methods", "POST,GET");
            }
            catch (Exception ex)
            {

            }
        }
    }

页面调用：

[Filters.Cors]
public ActionResult Index()
{
      return view();  
}