如何在asp.net网站中激活cors (Razor3)

<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>
</system.webServer>

protected void Application_BeginRequest(object sender, EventArgs e)
{
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type");
        HttpContext.Current.Response.End();
    }
}

[EnableCors(origins: "*", headers: "*", methods: "*")]
public class YourController : ApiController
{
    // Controller actions
}