ASP.NET MVC緩存過濾器用法

緩存過濾器用來輸出頁面緩存,其用法如下圖所示:

註意:

Duration:表示緩存多少秒;VaryByParam:表示緩存是否隨地址參數而改變。OutputCache除瞭可以定義在Action方法上面以外,還可以定義在控制器上面。

演示示例:

新建一個MVC應用程序,添加一個名為Cache的控制器,Cache控制器的Index方法裡面將當前時間輸出到頁面中,Cache控制器定義如下:

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

namespace _2_緩存過濾器.Controllers
{
    public class CacheController : Controller
    {
        [OutputCache(Duration =5,VaryByParam ="none")]
        // GET: Cache
        public ActionResult Index(int? id)
        {
            ViewData["CurrentTime"] = "現在的時間是:" + DateTime.Now;
            return View();
        }
    }
}

2、Cache控制器的Index視圖定義如下:

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <div> 
        <h2>@ViewData["CurrentTime"]</h2>
    </div>
</body>
</html>

 3、程序運行結果

刷新頁面的時候,隻有時間過瞭5秒以後,頁面上面顯示的時間才會刷新。

如果把VaryByParam的值改為id,那麼在5秒的時間范圍內,頁面顯示的時間會隨著id值的改變而改變,即隻要id的值改變一次,頁面顯示的時間就會改變。

在MVC程序中使用緩存過濾器的時候,由於控制器的代碼需要編譯後才能發佈,在發佈之後,如果要修改緩存的策略,就很麻煩,這時可以采用如下圖所示的方法,把緩存策略寫在配置文件裡面,這樣即使在程序發佈之後,我們也可以隨時調整緩存的策略。

配置文件修改如下:

<?xml version="1.0" encoding="utf-8"?>
<!--
  有關如何配置 ASP.NET 應用程序的詳細信息,請訪問
  https://go.microsoft.com/fwlink/?LinkId=301880
  -->
<configuration>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.6.1" />
    <httpRuntime targetFramework="4.6.1" />
    <httpModules>
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
    </httpModules>
    <!--緩存策略-->
    <caching>
      <outputCacheSettings>
        <outputCacheProfiles>
          <add name="cpfile" duration="5" varyByParam="none"/>
        </outputCacheProfiles>
      </outputCacheSettings>
    </caching>
  </system.web>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules>
      <remove name="ApplicationInsightsWebTracking" />
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
    </modules>
  </system.webServer>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.8.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.8.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
    </compilers>
  </system.codedom>
</configuration>

程序代碼修改如下:

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

namespace _2_緩存過濾器.Controllers
{
    public class CacheController : Controller
    {

        [OutputCache(CacheProfile = "cpfile")]
        // GET: Cache
        public ActionResult Index(int? id)
        {
            ViewData["CurrentTime"] = "現在的時間是:" + DateTime.Now;
            return View();
        }
    }
}

運行結果和上面的結果一樣。 

到此這篇關於ASP.NET MVC緩存過濾器用法的文章就介紹到這瞭。希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。

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