cache Element for caching (ASP.NET Settings Schema)

發行項
11/03/2006

Defines application-wide cache settings for an ASP.NET Web application.

<cache disableMemoryCollection="true|false" 
       disableExpiration="true|false" 
       privateBytesLimit="number" 
       percentagePhysicalMemoryUsedLimit="number" 
       privateBytesPollTime="HH:MM:SS" />

Attributes and Elements

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute	Description
disableMemoryCollection	Optional Boolean attribute. Gets or sets a value indicating whether the cache memory collection that occurs when the machine is under memory pressure is disabled.
disableExpiration	Optional Boolean attribute. Gets or sets a value indicating whether cache expiration is disabled. When disabled, cached items do not expire and background scavenging of expired cache items does not occur.
privateBytesLimit	Optional Int64 attribute. Gets or sets a value indicating the maximum size of an application's private bytes before the cache starts flushing expired items and attempting to reclaim memory. This limit includes both memory used by the cache as well as normal memory overhead from the running application. A setting of zero indicates that ASP.NET will use its own heuristics for determining when to start reclaiming memory.
percentagePhysicalMemoryUsedLimit	Optional Int32 attribute. Gets or sets a value indicating the maximum percentage of a machine's physical memory that can be consumed by an application before the cache starts flushing expired items and attempting to reclaim memory This memory usage includes both memory used by the cache as well as the normal memory usage of the running application. A setting of zero indicates that ASP.NET will use its own heuristics for determining when to start reclaiming memory.
privateBytesPollTime	Optional TimeSpan attribute. Gets or sets a value indicating the time interval between polling for the application's private bytes memory usage.

Child Elements

None.

Parent Elements

Element	Description
configuration	The required root element in every configuration file used by the common language runtime and .NET Framework applications.
system.web	Specifies the root element for the ASP.NET configuration settings in a configuration file. Contains configuration elements that configure ASP.NET Web applications and control how the applications behave.
caching	Configures the cache settings for a Web application.

Remarks

Default Configuration

The following default cache element is not explicitly configured in the machine configuration file or in the root Web.config file, but is the default configuration returned by application in the .NET Framework version 2.0.

<cache disableMemoryCollection = "false" 
  disableExpiration = "false" 
  privateBytesLimit = "0" 
  percentagePhysicalMemoryUsedLimit = "89" 
  privateBytesPollTime = "00:02:00" />

<cache disableMemoryCollection="false" 
  disableExpiration="false" privateBytesLimit="0" 
  percentagePhysicalMemoryUsedLimit="90" 
  privateBytesPollTime="00:02:00" />

Example

The following example sets the global cache settings for an ASP.NET application.

<cache disableMemoryCollection = "false" 
  disableExpiration = "false" 
  privateBytesLimit = "20971520" 
  percentagePhysicalMemoryUsedLimit = 60" 
  privateBytesPollTime = "00:01:00"/>

Element Information

Configuration Section Handler	System.Web.Configuration.CacheSection
Configuration Member	Cache
Configurable Locations	Machine.config Root level Web.config Application level Web.config
Requirements	IIS version 5.0, 5.1 and 6.0 .NET Framework version 2.0 Visual Studio 2005

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cache Element for caching (ASP.NET Settings Schema)

Attributes and Elements

Attributes

Child Elements

Parent Elements

Remarks

Default Configuration

Example

Element Information

See Also

Tasks

Reference

Concepts

Other Resources

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