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Output Caching tutorials

  • Output caching is the caching of pages or portions of pages that are output to the client. This does not happen automatically. The developer must enable output caching using either the OutputCache directive or the HttpCachePolicy class. We will describe both methods.

  • You can apply output caching to an entire page or to a portion of a page. To cache only a portion of a page, you apply the caching to a user control contained within the page. We will describe this later in this chapter.

Syntax:

The syntax of the output caching is:

<%@ OutputCache Duration="#no ofseconds"

Location="Any | Client | Downstream | Server | None | ServerAndClient "

Shared="True | False"

VaryByControl="controlname"

VaryByCustom="browser | customstring"

VaryByHeader="headers"

VaryByParam="parameter_name"

VaryByContentEncoding="encodings" ProviderName="Provider_name" %>

  • The below tables shows the list of attributes of output caching:

 

Attributes

Description

CacheProfile

Optional, The name of the cache settings to associate with the page

Duration

The time, in seconds, that the page or user control is cached

Location

Default is Any,

NoStore

Specifies a Boolean value that determines whether to prevent secondary storage of sensitive information

ProviderName

Specifies a string value that identifies the custom output-cache provider to used

SqlDependency

A string value that identifies a set of database and table name pairs that a page or control's output cache depends on

Shared

A Boolean value that determines whether user control output can be shared with multiple pages, The default is false

VaryByHeader

A semicolon-separated list of HTTP headers used to vary the output cache

VaryByCustom

Any text that represents custom output caching requirements

VaryByParam

A semicolon-separated list of strings used to vary the output cache.

VaryByContentEncodings

This attributes specify a semicolon-separated list of strings that are used to vary the output cache.

VaryByControl

A semicolon-separated list of strings used to vary a user control's output cache with the ID.

 

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