ASP.NET-MVC – ASP.NET MVC 2 – Redirect errors from ActionFilter?

protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
{
 string redirectOnSuccess = filterContext.HttpContext.Request.Url.AbsolutePath;
 string redirectUrl = string.Format("?ReturnUrl={0}" , redirectOnSuccess);
 filterContext.Result = new RedirectResult(redirectUrl);
 return;
}

Changed from mvc1 and mvc2 What? If the user is not authenticated, I have the following code to redirect to the login page. This does not apply to mvc2 and results in "System.Web.HttpException: Cannot redirect after sending HTTP header"

public class RequiresAuthenticationAttribute: FilterAttribute, IAuthorizationFilter
{
 public void OnAuthorization(AuthorizationContext filterContext)
 {
 if (!filterContext.HttpContext.User.Identity .IsAuthenticated)
 {
 string redirectOnSuccess = filterContext.HttpContext.Request.Url.AbsolutePath;
 string redirectUrl = string.Format("?ReturnUrl={0}", redirectOnSuccess);
 string loginUrl = System.Web.Security.FormsAuthentication.LoginUrl + redirectUrl;
 filterContext.HttpContext.Response.Redirect(loginUrl, true);
 }
 }
}< /pre> 
The stack trace is as follows:
 
 
System.Web.HttpException: Cannot redirect after HTTP headers have been sent.
 at System.Web.HttpResponse. Redirect(String url, Boolean endResponse)
 at System.Web.HttpResponseWrapper.Redirect(String url, Boolean endResponse)
 at System.Web.Mvc.RedirectResult.ExecuteResult(ControllerContext context)
 at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
 at System.Web.Mvc.ControllerActionInvoker.<> c__DisplayClass14.b__11()
 at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
 at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass14 .<>c__DisplayClass16.b__13()
 at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
 at System.Web.Mvc.ControllerActionInvoker. InvokeAction(ControllerContext controllerContext, String actionName)

All you have to do is to override HandleUnauthorizedRequest instead of OnAuthorization, just assign the RedirectResult url to AuthorizationContext.Result. < p>
base.OnAuthorization will check the authentication and call HandleUnauthorizedRequest if it fails.

protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
{ 
 string redirectOnSuccess = filterContext.HttpContext.Request.Url.AbsolutePath;
 string redirectUrl = string.Format("?ReturnUrl={0}", redirectOnSuccess);
 filterContext.Result = new RedirectResult (redirectUrl);
 return;
}