如題，如果在Filter中用Response.Redirect,雖然URL是跳轉了，但是之後的Filter和Action還是會執行，不僅浪費資源，還會產生一些不必要的錯誤，或許，這些錯誤僅在你的錯誤日誌中能看到。

在Filter中錯誤使用跳轉如下：

public class AnchorFilter : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { if (!string.IsNullOrEmpty(filterContext.HttpContext.Request.QueryString["r_Anchor"])) { filterContext.HttpContext.Response.Redirect(string.Format("{0}#{1}", filterContext.HttpContext.Request.Url. AbsolutePath, filterContext.HttpContext.Request. QueryString["r_Anchor"])); return; } base.OnActionExecuting(filterContext); } }

filterContext.HttpContext.Response.Redirect (string.Format("{0}#{1}",
                                                                              filterContext.HttpContext.Request.Url.
                                                                                  AbsolutePath,
                                                                              filterContext.HttpContext.Request.
                                                                                  QueryString["r_Anchor"]));

filterContext.HttpContext.Response.Redirect 就會產生後遺症，正確使用應該是：

filterContext.Result = new RedirectResult(string.Format("{0}#{1}",
                                                                              filterContext.HttpContext.Request.Url.
                                                                                  AbsolutePath,
                                                                              filterContext.HttpContext.Request.
                                                                                  QueryString["r_Anchor"]));

正確程式碼：

public class AnchorFilter : ActionFilterAttribute { public override void OnActionExecuting(ActionExecutingContext filterContext) { if (!string.IsNullOrEmpty(filterContext.HttpContext.Request.QueryString["r_Anchor"])) { filterContext.Result = new RedirectResult(string.Format("{0}#{1}", filterContext.HttpContext.Request.Url. AbsolutePath, filterContext.HttpContext.Request. QueryString["r_Anchor"])); //filterContext.HttpContext.Response.Redirect(string.Format("{0}#{1}", // filterContext.HttpContext.Request.Url. // AbsolutePath, // filterContext.HttpContext.Request. // QueryString["r_Anchor"])); return; } base.OnActionExecuting(filterContext); } }