在asp.net web方法中启用CORS

Question

      protected void Application_BeginRequest(object sender, EventArgs e)
                {
                    var context = HttpContext.Current;
                    var response = context.Response;
                    response.AddHeader("Access-Control-Allow-Origin", "*");

                    if (context.Request.HttpMethod == "OPTIONS")
                    {
                        response.AddHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
                        response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
                        response.End();
                    }
                }

如何在asp.net web方法中启用CORS
在global.asax

中添加的示例代码上方

谢谢