Output caching in ASP.NET MVC application

ASP.NET MVC应用性能优化

最新推荐文章于 2025-09-10 18:00:18 发布

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最新推荐文章于 2025-09-10 18:00:18 发布

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文章标签：测试 xhtml 数据库

原文链接：http://www.cnblogs.com/JosephLiu/archive/2010/02/21/1670271.html

本文介绍如何使用输出缓存来提升ASP.NET MVC应用的性能。通过缓存控制器操作返回的内容，避免每次请求都重新执行相同的数据库查询，从而减少服务器的工作负担。文中详细解释了如何配置缓存时长及缓存位置。

Goal: Here, I am going to explain, how we can improve performance of ASP.Net MVC application using output caching.

Advantage:

It enables us to cache the content returned by Controller action.
It stops controller action to generate same content each time.
We can set caching parameter using output cache.
We can specify where to send caching data. For example web Server or user browser etc.
Caching enables us to avoid performing redundant work at server.
How it helps?

Imagine, for example, that our ASP.NET MVC application displays a list of database records in a view named Display. Normally, each and every time that a user invokes the controller action that returns the Display view, the set of database records must be retrieved from the database by executing a database query.

If, on the other hand, we take advantage of the output cache then we can avoid executing a database query every time any user invokes the same controller action. The view can be retrieved from the cache instead of being regenerated from the controller action.

How to enable Output Caching?

namespace SampleMVC1.Controllers
{
    public class customController:Controller
    {
        [OutputCache (Duration=20, VaryByParam="None" )]
        public ActionResult display()
       {

//Response.redirect();

            // ViewData["Message"] = "Welcome to Dhananjay!";
          return Content("I will Kill you MVC");
            //return View();
        }
    }
}

Here, we are enabling Output cache for a controller named customController. In above listing output of display action will be cached for 20 seconds. In above code, we are enabling output cache for display action of customController controller. If we want to enable output caching for entire controller (display), then, we will have to write code as follows

namespace SampleMVC1.Controllers
{
    [OutputCache(Duration = 20, VaryByParam = "None")]
    public class customController:Controller
    {
       // [OutputCache (Duration=20, VaryByParam="None" )]
        public ActionResult display()
        {

//Response.redirect();

// ViewData["Message"] = "Welcome to Dhananjay!";

          return Content("I will Kill you MVC");
            //return View();
        }
    }
}

How to calculate caching duration?

If we want to cache output of controller action for one day then parameter to duration would be calculated as 60 sec * 60 Min * 24 hrs = 86400 seconds.

[OutputCache(Duration = 86400, VaryByParam = "None")]

Where Content is Cached

By default, when we use the [OutputCache] attribute, content is cached in three locations:

the web server
any proxy servers
the web browser.

We can control exactly where content is cached by modifying the Location property of the [OutputCache] attribute.

We can set the Location property to any one of the following values:

Any
Client
Downstream
Server
None
ServerAndClient

By default, the Location property has the value Any. However, there are situations in which you might want to cache only on the browser or only on the server. For example, if we are caching information that is personalized for each user then we should not cache the information on the server. If we are displaying different information to different users then we should cache the information only on the client.

How to create a cache profile?

Cache profile could be created in Web.config file. Creating cache profile in Web.config having many advantages, like

We can store controller action cache in one central location.
We can create one cache profile and apply the profile to several controllers or controller actions.
We can modify Web.config file without recompiling the application.

Cache profile in Web.config file.

How to apply cache profile in Controller action?

[OutputCache(Duration = 10, VaryByParam = "none")]

public ActionResult Index()

{

return View();

}

Caching Example:

This caching example will display same time for 10 seconds

Home\Index.Cs

using System.Web.Mvc;

namespace MvcApplication1.Controllers