<namedCaches> Element (Cache Settings)

Article
05/25/2022

Specifies a collection of configuration settings for the named MemoryCache instances. The NamedCaches property references the collection of configuration settings from one or more namedCaches elements of the configuration file.

<configuration>
  <system.runtime.caching>
    <memoryCache>
      <namedCaches>

Syntax

<namedCaches>  
  <add name="Default"/>
</namedCaches>

Type

None

Attributes and Elements

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

Attributes

Attribute	Description
`cacheMemoryLimitMegabytes`	An integer value that specifies the maximum allowable size, in megabytes, that an instance of a MemoryCache can grow to. The default value is 0, which means that the autosizing heuristics of the MemoryCache class are used by default.
`name`	The name of the cache.
`physicalMemoryLimitPercentage`	An integer value between 0 and 100 that specifies the maximum percentage of physically installed computer memory that can be consumed by the cache. The default value is 0, which means that the autosizing heuristics of the MemoryCache class are used by default.
`pollingInterval`	A value that indicates the time interval after which the cache implementation compares the current memory load against the absolute and percentage-based memory limits that are set for the cache instance. This value is entered in "HH:MM:SS" format.

Child Elements

Element	Description
<add>	Adds a named cache to the `namedCaches` collection for a memory cache.
<clear>	Clears the `namedCaches` collection for a memory cache.
<remove>	Removes a named cache entry from the `namedCaches` collection for a memory cache.

Parent Elements

Element	Description
<configuration>	Specifies the root element in every configuration file that is used by the common language runtime and .NET Framework applications.
<memoryCache>	Defines an element that is used to configure a cache that is based on the MemoryCache class.
<system.runtime.caching>	Contains types that let you implement output caching in applications that are built into the .NET Framework.

Remarks

The memory cache configuration section of the Web.config file can contain add, remove, and clear attributes for the namedCaches collection. Each namedCaches entry is uniquely identified by the name attribute.

You can retrieve instances of memory cache entries by referencing the information in the application configuration files. By default, only the default cache instance has an entry in the configuration file. The default cache instance is the instance that is returned from the Default property.

If you set the name attribute to "Default", the element uses the default memory cache instance.

Example

The following example shows how to set the name of the cache to the default cache entry name by setting the name attribute to "Default".

The cacheMemoryLimitMegabytes attribute and the physicalMemoryPercentage attribute are set to zero. Setting these attributes to zero means that the autosizing heuristics of the MemoryCache class are used. The cache implementation compares the current memory load against the absolute and percentage-based memory limits every two minutes.

<configuration>  
  
  <system.runtime.caching>  
    <memoryCache>  
      <namedCaches>  
          <add name="Default"
               cacheMemoryLimitMegabytes="0"
               physicalMemoryLimitPercentage="0"  
               pollingInterval="00:02:00" />  
      </namedCaches>  
    </memoryCache>  
  </system.runtime.caching>  
  
</configuration>

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