Shulou(Shulou.com)06/02 Report--

This article introduces the knowledge of "what is the ASP.NET data caching mechanism". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

◆ page output cache: save the page processing output and reuse the saved output next time

◆ application caching: allows caching of generated data, such as DataSet

㈠ ASP.NET data cache page output cache

1. Several forms of ASP.NET data cache page output cache

① <% @ OutputCache Duration= "60" VaryByParam= "None" Location= "Any"% >

Location specifies where to cache, and Any caches anywhere.

What you see in 60 seconds is the same.

② can also write in the configuration file and then invoke the cache name of the configuration file on the page.

③ programmatically:

Response.Canche.SetExpires (DateTime.Now.AddSeconds (3)); Response.Canche.SetCacheabiliy (HttpCacheability.Public); Response.Canche.SetValidUntilExpires (true)

Equivalent to:

Public = > Any Private = > Client NoCache = > None Server = > Server ServerAndPrivate = > ServerAndClient

2. ASP.NET data cache uses file dependencies to cache page output

Generate background: sometimes, you may need to remove an item from the output cache when the file changes. That is to say, the cache becomes invalid immediately after the file is changed.

String filepath = Server.MapPath ("TextFile1.txt"); Response.AddFileDependency (filepath); / / add cache dependencies Response.Cache.SetExpires (DateTime.Now.AddSeconds (60)); Response.Cache.SetCacheability (HttpCacheability.Public); Response.Cache.SetValidUntiExpires (true)

3. ASP.NET data cache caches multiple versions

① uses the requested browser to cache versions of the page

<% @ OutputCache Duration= "10" VaryByParam= "None" VaryByCustom= "browser" >

② uses parameters to cache versions of the page

<% @ OutputCache Duration= "60" VaryByParam= "City"% >

For this debugging, you can add QueryString after url.

For example,... url?City=shanghai

Get this Shanghai in the program and then do other operations. At this time, if the parameter is still shanghai, it will not go into the program.

4. ASP.NET data cache dynamically updates the part of the cached page. There are three ways to achieve partial non-caching.

① has declared to use Substitution controls

< asp:Substitution ID= "Substitution1" runat= "server" MethodName= "GetCurrentDateTime" / > public static string GetCurrentDateTime (HttpContext context) {return DateTime.Now.ToString ();} / / the method signature must be consistent with the delegate signature

② uses the Substitution control API programmatically

Response.WriteSubstitution (new HttpResponseSubstitutionCallback (GetCurrentDateTime))

③ uses AdRotator controls implicitly

This control will never be cached

㈡ ASP.NET data cache SQL Server depends on the cache, which is very useful

Clear the cache when the table data changes

1. ASP.NET data cache enables cache notification for SQL Server

Aspnet_regsql.exe-S < Server >-U < Username >-P < Password >-ed-d Northwind-et-t Employees

Server: server

Username: user name

Password: password

Northwind: database

Employees: tabl

2. ASP.NET data cache configures web pages for caching.

<% @ OutputCache Duration= "3600" SqlDependency= "Northind:Employees" VaryByParam= "none" >

3. ASP.NET data cache is stored in Web.config file to set cache configuration.

< caching > < sqlCacheDependency enabled= "true" pollTime= "1000" > < database > < add name= "Northind" connectionStringName= "..." PollTime = "1000" / > < / database > < / sqlCacheDependency > < / caching > "what is the ASP.NET data caching mechanism"? thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.