asp.net – 返回新的RedirectResult()vs返回Redirect()

以下两个控件之间的区别ActionResult返回语句：

return new RedirectResult("http://www.google.com",false);

和

return Redirect("http://www.google.com");

解决方法

直接从 source

// copyright (c) Microsoft Open Technologies,Inc. All rights reserved. See License.txt in the project root for license information.

using System.Diagnostics.CodeAnalysis;
using System.Web.Mvc.Properties;

namespace System.Web.Mvc
{
    // represents a result that performs a redirection given some URI
    public class RedirectResult : ActionResult
    {
        [SuppressMessage("Microsoft.Design","CA1054:UriParameteRSShouldNotBeStrings",MessageId = "0#",Justification = "Response.Redirect() takes its URI as a string parameter.")]
        public RedirectResult(string url)
            : this(url,permanent: false)
        {
        }

        [SuppressMessage("Microsoft.Design",Justification = "Response.Redirect() takes its URI as a string parameter.")]
        public RedirectResult(string url,bool permanent)
        {
            if (String.IsNullOrEmpty(url))
            {
                throw new ArgumentException(MvcResources.Common_NullOrEmpty,"url");
            }

            Permanent = permanent;
            Url = url;
        }

        public bool Permanent { get; private set; }

        [SuppressMessage("Microsoft.Design","CA1056:UriPropertiesShouldNotBeStrings",Justification = "Response.Redirect() takes its URI as a string parameter.")]
        public string Url { get; private set; }

        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            if (context.IsChildAction)
            {
                throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);
            }

            string destinationUrl = UrlHelper.GenerateContentUrl(Url,context.HttpContext);
            context.Controller.TempData.Keep();

            if (Permanent)
            {
                context.HttpContext.Response.RedirectPermanent(destinationUrl,endResponse: false);
            }
            else
            {
                context.HttpContext.Response.Redirect(destinationUrl,endResponse: false);
            }
        }
    }
}

第二个参数决定是否为response is a 302 (temporary) or 301 permanent redirection.默认情况下,该值为false.

第二种方法是在Controller上,简单的方便.这种方法已经在一些版本的MVC(至少至少2),但IIRC,添加永久部分到RedirectResult我认为已经进入了MVC 4(我不记得看到它在MVC 3).

// copyright (c) Microsoft Open Technologies,Inc. All rights reserved. See License.txt in the project root for license information.

using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Security.Principal;
using System.Text;
using System.Web.Mvc.Async;
using System.Web.Mvc.Properties;
using System.Web.Profile;
using System.Web.Routing;
namespace System.Web.Mvc
{
    [SuppressMessage("Microsoft.Maintainability","CA1506:AvoidExcessiveClasscoupling",Justification = "Class complexity dictated by public surface area")]
    public abstract class Controller : ControllerBase,IActionFilter,IAuthorizationFilter,Idisposable,IExceptionFilter,IResultFilter,IAsyncController,IAsyncManagerContainer
    {
      // omitted for brevity

      [SuppressMessage("Microsoft.Design",Justification = "Response.Redirect() takes its URI as a string parameter.")]
      protected internal virtual RedirectResult Redirect(string url)
      {
          if (String.IsNullOrEmpty(url))
          {
              throw new ArgumentException(MvcResources.Common_NullOrEmpty,"url");
          }

          return new RedirectResult(url);
      }
    }
}