public class PermanentRedirectResult : ActionResult
    {    
        public string Url { get; set; }

        public PermanentRedirectResult(string url)
        {
            this.Url = url;
        }

        public override void ExecuteResult(ControllerContext context)
        {
            context.HttpContext.Response.StatusCode = (int)HttpStatusCode.MovedPermanently;
            context.HttpContext.Response.RedirectLocation = this.Url;
            context.HttpContext.Response.End();
        }
    }

然后用它……

public ActionResult Action1()
        {          
            return new PermanentRedirectResult("https://stackoverflow.com");
        }

一个更完整的答案将重定向到路线… Correct Controller code for a 301 Redirect