以下两个控制器 ActionResult 返回语句有什么区别:
return new RedirectResult("http://www.google.com", false);
和
return Redirect("http://www.google.com");
以下两个控制器 ActionResult 返回语句有什么区别:
return new RedirectResult("http://www.google.com", false);
和
return Redirect("http://www.google.com");
直接从源头
// 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);
}
}
}
}
第二个参数确定响应是 302(临时)还是 301 永久重定向。默认情况下,该值为false
。
第二种方法是打开Controller
的,只是一种方便的方法。这种方法已经出现在 MVC 的多个版本中(至少可以追溯到 2 个版本),但是 IIRC,RedirectResult
我认为在 MVC 4 中添加了永久部分(我不记得在 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);
}
}
}
this.Redirect(string url) - 它将在内部创建 RedirectResult 类的新对象并进行临时重定向。
new RedirectResult(string url, bool Permanent) - 它将重定向,但为您提供永久或临时重定向的选项。
他们做同样的事情。控制器的 Redirect 方法创建一个新的 RedirectResult。如果您实例化 RedirectResult,您还可以添加一个参数来确定重定向是否是永久的(或不是)。