csharp 如果页面对移动/非移动上下文无效，则MVC4操作过滤器属性将重定向到不同的控制器

Posted 2021-05-12

using System.Web.Mvc;
using System.Web.Routing;
using System.Web.WebPages;

namespace MyNamespace
{
  public enum DeviceType {Mobile, Desktop}

	public class DeviceTypeRedirect : ActionFilterAttribute
	{
		public string RedirectController { get; set; }

		public string RedirectAction { get; set; }

		public DeviceType RedirectOnDevice { get; set; }

		public override void OnActionExecuting(ActionExecutingContext filterContext)
		{
			base.OnActionExecuting(filterContext);

			if (filterContext.HttpContext.GetOverriddenBrowser().IsMobileDevice == (this.RedirectOnDevice == DeviceType.Mobile))
			{
				this.RedirectToRoute(filterContext, new { controller = this.RedirectController, action = this.RedirectAction });
			}
		}

		private void RedirectToRoute(ActionExecutingContext context, object routeValues)
		{
			var rc = new RequestContext(context.HttpContext, context.RouteData);
			var virtualPathData = RouteTable.Routes.GetVirtualPath(rc, new RouteValueDictionary(routeValues));
			if (virtualPathData != null)
			{
				string url = virtualPathData.VirtualPath;
				context.HttpContext.Response.Redirect(url, true);
			}
		}
	}
}