ASP MVC 3註銷

Question

我在asp.mvc中註銷時遇到問題。 用戶可以按回來按鈕，他會看到上次訪問的頁面。

我進行了一些搜索，發現類似這樣的解決方案：

this.Response.Cache.SetExpires(DateTime.UtcNow.AddYears(-1)); 
this.Response.Cache.SetCacheability(HttpCacheability.NoCache); 
this.Response.Cache.SetNoStore(); 

，但我應該把它添加到每個網頁，使其工作。

是否有某種方法可以禁用緩存，用於mvc應用程序中所有控制器的所有GET請求，然後爲其中一些例如屬性或自定義過濾器啓用它？

Answer 1

讓它在全球範圍內工作並不是太多工作。我過去所做的是創建一個派生自ActionFilter的類，然後將其作爲global.asax中的全局動作過濾器添加。另請注意，實際上強制所有瀏覽器重新加載並非微不足道。即使下面的代碼並不總是與Safari一起使用，Safari通常不得不通過空身體標籤或類似的onload來欺騙。

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Web.Mvc; 

/// <summary> 
/// Action filter that instructs the page to expire. 
/// </summary> 
public class PageExpirationAttribute : ActionFilterAttribute 
{ 
    /// <summary> 
    /// The OnActionExecuted method. 
    /// </summary> 
    /// <param name="filterContext">The current ActionExecutedContext. </param> 
    public override void OnActionExecuting(ActionExecutingContext filterContext) 
    { 
     base.OnActionExecuting(filterContext); 

     filterContext.HttpContext.Response.ClearHeaders(); 
     filterContext.HttpContext.Response.AppendHeader("Cache-Control", "no-cache, no-store, must-revalidate, post-check=0, pre-check=0, max-age=0"); 
     filterContext.HttpContext.Response.AppendHeader("Pragma", "no-cache"); 
     filterContext.HttpContext.Response.AppendHeader("Keep-Alive", "timeout=3, max=993"); 
     filterContext.HttpContext.Response.AppendHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT"); 
    } 
} 

如果您希望能夠排除某些頁面，則可以創建可應用於控制器或方法的另一個屬性。你OnActionExecuting（）可以檢查是否存在該屬性：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)] 
public sealed class AllowCachingAttribute : Attribute 
{ 
} 

近似代碼添加到OnActionExecuting

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Web.Mvc; 

/// <summary> 
/// Action filter that instructs the page to expire. 
/// </summary> 
public class PageExpirationAttribute : ActionFilterAttribute 
{ 
    /// <summary> 
    /// The OnActionExecuted method. 
    /// </summary> 
    /// <param name="filterContext">The current ActionExecutedContext. </param> 
    public override void OnActionExecuting(ActionExecutingContext filterContext) 
    { 
     base.OnActionExecuting(filterContext); 

     bool skipCache = filterContext.ActionDescriptor.IsDefined(typeof(AllowCachingAttribute), true) 
       || filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(AllowCachingAttributee), true); 

     if (!skipCache) 
     { 

     filterContext.HttpContext.Response.ClearHeaders(); 
     filterContext.HttpContext.Response.AppendHeader("Cache-Control", "no-cache, no-store, must-revalidate, post-check=0, pre-check=0, max-age=0"); 
     filterContext.HttpContext.Response.AppendHeader("Pragma", "no-cache"); 
     filterContext.HttpContext.Response.AppendHeader("Keep-Alive", "timeout=3, max=993"); 
     filterContext.HttpContext.Response.AppendHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT"); 
     } 
    } 
} 

Answer 2

您可以創建一個實用程序類並添加一個公共靜態方法，執行上述代碼然後調用它。然後在您的Methods的控制器中調用Utilities方法。我將提供一些代碼：

namespace App 
{ 
    public class Utility 
    { 
     public static void SetResponsAttributes(HttpResponseBase theResponseObject) 
     { 
      if (theResponseObject == null) return; 

      theResponseObject.Cache.SetExpires(DateTime.UtcNow.AddYears(-1)); 
      theResponseObject.Cache.SetCacheability(HttpCacheability.NoCache); 
      theResponseObject.Cache.SetNoStore(); 
     } 
    } 
} 

Answer 3

爲什麼不設置會話標誌來指示已登錄的指示器並將整個視圖內容包裝在if塊內。在註銷時放棄會話。