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System.Runtime.Caching Namespace

The System.Runtime.Caching namespace contains types that let you implement caching in NET Framework applications.

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 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 Framework 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.

  Class Description
Public class CacheEntryChangeMonitor Provides a base class that represents a ChangeMonitor type that can be implemented in order to monitor changes to cache entries.
Public class CacheEntryRemovedArguments Provides information about a cache entry that was removed from the cache.
Public class CacheEntryUpdateArguments Provides information about a cache entry that will be removed from the cache.
Public class CacheItem Represents an individual cache entry in the cache.
Public class CacheItemPolicy Represents a set of eviction and expiration details for a specific cache entry.
Public class ChangeMonitor Provides a base class for a derived custom type that monitors changes in the state of the data which a cache item depends on.
Public class FileChangeMonitor Represents an object that monitors changes to files.
Public class HostFileChangeMonitor Monitors directories and file paths and notifies the cache of changes to the monitored items. This class cannot be inherited.
Public class MemoryCache Represents the type that implements an in-memory cache.
Public class ObjectCache Represents an object cache and provides the base methods and properties for accessing the object cache.
Public class SqlChangeMonitor Provides change monitoring for SQL Server databases. This class cannot be inherited.

  Delegate Description
Public delegate CacheEntryRemovedCallback Defines a reference to a method that is called after a cache entry is removed from the cache.
Public delegate CacheEntryUpdateCallback Defines a reference to a method that is invoked when a cache entry is about to be removed from the cache.
Public delegate OnChangedCallback Defines a reference to a method that handles changes to monitored items.

  Enumeration Description
Public enumeration CacheEntryRemovedReason Specifies the reason why a cache entry was removed or an entry is about to be removed.
Public enumeration CacheItemPriority Specifies a priority setting that is used to decide whether to evict a cache entry.
Public enumeration DefaultCacheCapabilities Represents a set of features that a cache implementation provides.
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