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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.runtime.caching below:

System.Runtime.Caching Namespace

Contains types that let you implement caching in .NET applications.

Classes CacheEntryChangeMonitor

Provides a base class that represents a ChangeMonitor type that can be implemented in order to monitor changes to cache entries.

CacheEntryRemovedArguments

Provides information about a cache entry that was removed from the cache.

CacheEntryUpdateArguments

Provides information about a cache entry that will be removed from the cache.

CacheItem

Represents an individual cache entry in the cache.

CacheItemPolicy

Represents a set of eviction and expiration details for a specific cache entry.

ChangeMonitor

Provides a base class for a derived custom type that monitors changes in the state of the data that a cache item depends on.

FileChangeMonitor

Represents an object that monitors changes to files.

HostFileChangeMonitor

Monitors directories and file paths and notifies the cache of changes to the monitored items. This class cannot be inherited.

MemoryCache

Represents the type that implements an in-memory cache.

ObjectCache

Represents an object cache and provides the base methods and properties for accessing the object cache.

SqlChangeMonitor

Provides change monitoring for SQL Server databases. This class cannot be inherited.

Enums Delegates CacheEntryRemovedCallback

Defines a reference to a method that is called after a cache entry is removed from the cache.

CacheEntryUpdateCallback

Defines a reference to a method that is invoked when a cache entry is about to be removed from the cache.

OnChangedCallback

Defines a reference to a method that handles changes to monitored items.

The classes in this namespace provide a way to use caching facilities like those in ASP.NET, but without a dependency on the System.Web assembly.

Note

The output caching functionality and types in the System.Runtime.Caching namespace were introduced in .NET Framework 4.

The caching types that are provided in this namespace offer the following features:

Caching is accessible to all .NET applications (not just ASP.NET).
Caching is extensible.
You can create custom caching providers. For example, instead of using the default in-memory cache engine, you can create custom providers that store cache data in databases, in custom objects, or in the file system.