返回新的 RedirectResult() 與返回 Redirect()

以下兩個控制器 ActionResult 返回語句有什麼區別：

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

和

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

直接從**源頭**

// 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", "CA1054:UriParametersShouldNotBeStrings", MessageId = "0#", 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);
           }
       }
   }
}

第二個參數確定響應是 302（臨時）還是 301 永久重定向。預設情況下，該值為false。

第二種方法是打開Controller的，只是一種方便的方法。這種方法已經出現在 MVC 的多個版本中（至少可以追溯到 2 個版本），但是 IIRC，RedirectResult我認為在 MVC 4 中添加了永久部分（我不記得在 MVC 中看到它） 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", "CA1054:UriParametersShouldNotBeStrings", MessageId = "0#", 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);
     }
   }
}

引用自：https://stackoverflow.com/questions/14875894