遇見零壹魔王

SAMPLE-1.

public class HomeController : Controller
{
	[OutputCache(Duration = 60)]
	public ActionResult Index()
	{
		ViewBag.Subject = "設定Cache時間60秒";
		ViewBag.Description = "Location 不設定的話，預設值為OutputCacheLocation.Any可參考( https://msdn.microsoft.com/zh-tw/library/dd492985(v=vs.118).aspx)";
		ViewBag.CacheTime = DateTime.Now; 
		return View();
	}
}

<div>
    <label>@ViewBag.Subject</label>
    <div>@ViewBag.Description</div>
    <div>@ViewBag.CacheTime</div>
</div>

 

SAMPLE-2.

[OutputCache(Location = System.Web.UI.OutputCacheLocation.Client,Duration = 60)]
public ActionResult Index2()
{
	ViewBag.Subject = "設定Cache存在Client端，時間60秒";
	ViewBag.Description = "按下F5重新整理頁面就會把存在Client的OutputCache清掉，但如果先連到別的頁面再回來此頁會發現cache還在";
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

View部分都return到同一個View所以就不重複了

SAMPLE-3.

[OutputCache(Location = System.Web.UI.OutputCacheLocation.Server, Duration = 60)]
public ActionResult Index3()
{
	ViewBag.Subject = "設定Cache存在Server端，時間60秒";
	ViewBag.Description = "參考(https://msdn.microsoft.com/zh-tw/library/system.web.ui.outputcachelocation(v=vs.118).aspx)";
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

 

SAMPLE-4.

[OutputCache(Location = System.Web.UI.OutputCacheLocation.ServerAndClient, Duration = 60)]
public ActionResult Index4()
{
	ViewBag.Subject = "設定Cache存在Client端及Server端，時間60秒";
	ViewBag.Description = "參考(https://msdn.microsoft.com/zh-tw/library/system.web.ui.outputcachelocation(v=vs.118).aspx)";
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

 

SAMPLE-5.

[OutputCache(Location = System.Web.UI.OutputCacheLocation.Any, Duration = 60)]
public ActionResult Index5()
{
	ViewBag.Subject = "設定Cache存在Client端及Server端及Proxy代理伺服器，時間60秒";
	ViewBag.Description = "參考(https://msdn.microsoft.com/zh-tw/library/system.web.ui.outputcachelocation(v=vs.118).aspx)";
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

因為每個ActionResult都設定自己Cache的時間(Duration)，假如以後60秒全部要改成120秒會有點麻煩，為了方便之後維護

加入outputCacheProfiles

Web.config部分

<configuration>
  <system.web>
     <caching>
      <outputCacheSettings>
        <outputCacheProfiles>
          <add name="TenSec" enabled="true" duration="10" varyByParam="*" varyByCustom="browser" location="Any" />
          <add name="OneMinute" enabled="true" duration="60" varyByParam="*" varyByCustom="browser" location="Any" />
          <add name="AllPassParam" enabled="true" duration="120" varyByParam="*" varyByCustom="browser" location="Any" />
          <add name="SpecifyParam" enabled="true" duration="120" varyByParam="myId,myName" varyByCustom="browser" location="Any" />
          <add name="NotAllowParam" enabled="true" duration="120" varyByParam="None" varyByCustom="browser" location="Any" />
        </outputCacheProfiles>
      </outputCacheSettings>
    </caching>
  </system.web>
</configuration>

依照個人需求設定Cache時間(Duration)

接著只要在ActionResult上的Attribute中把CacheProfile 設定成在outputCacheProfiles內的任一個項目即可

[OutputCache(CacheProfile = "OneMinute")]
public ActionResult Index()
{
	ViewBag.Subject = "透過CacheProfile集中管理使用OneMinute的設定";
	ViewBag.Description = "當有兩個以上相同的時候都是參考相同的設定所以方便維護";
	ViewBag.CacheTime = DateTime.Now;
	return View();
}

有時候網頁時會有不同的QueryString，例如?page=2 之類的，參數不同的時後可能會需要建立不同的outputCache

才不會所有造成不管瀏覽第幾頁或是給不同參數，卻都顯示相同頁面相同內容的問題

Situation-1. 不做限制任何參數都建立一個不同版本的outputCache

[OutputCache(CacheProfile = "AllPassParam",VaryByParam ="*")]
public ActionResult Index(string x,string y, string z)
{
	ViewBag.Subject = "不限制參數";
	ViewBag.Description = "只要參數不同或是參數的值不同，就會建立一版不同的cache";
	ViewBag.eg = string.Format("代入的參數值為:{0},{1},{2}",x,y,z);
	ViewBag.CacheTime = DateTime.Now;
	return View();
}

Situation-2. 指定某些參數值不同時會建立一個不同版本的outputCache

[OutputCache(CacheProfile = "SpecifyParam",VaryByParam = "myId;myName")]
public ActionResult Index2(string myId, string myName, string myAge)
{
	ViewBag.Subject = "指定參數";
	ViewBag.Description = "本範例設定為只有參數myId及myName的值不同時會建立不同版本的cache，參數myAge不會";
	ViewBag.eg = string.Format("代入的參數值為:{0},{1},{2}", myId, myName, myAge);
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

Situation-3. 不允許任何參數，不管任何參數值不同都不會建立不同版本的outputCache

(不管參數怎麼變大家讀到的都是相同頁面相同內容)

[OutputCache(CacheProfile = "NotAllowParam",VaryByParam ="none")]
public ActionResult Index3(string myId, string myName, string myAge)
{
	ViewBag.Subject = "不允許參數";
	ViewBag.Description = "本範例設定為只有一個版本的cache，參數的值不同並不會建立不同版本的cache";
	ViewBag.eg = string.Format("代入的參數值為:{0},{1},{2}", myId, myName, myAge);
	ViewBag.CacheTime = DateTime.Now;
	return View("Index");
}

在設定後發現將varyByParam參數設定在web.config疑似會問題有參考以下網址
http://stackoverflow.com/questions/23764926/asp-net-outputcache-varybyparam-does-not-work-in-web-config

範例檔:

https://bitbucket.org/yu_allen/outputcacheexercise/src/