MemoryCache.CreateCacheEntryChangeMonitor Method

Creates a CacheEntryChangeMonitor object that can trigger events in response to changes to specified cache entries.

Namespace:  System.Runtime.Caching
Assembly:  System.Runtime.Caching (in System.Runtime.Caching.dll)

public override CacheEntryChangeMonitor CreateCacheEntryChangeMonitor(
	IEnumerable<string> keys,
	string regionName
)

Parameters

keys
Type: System.Collections.Generic.IEnumerable<String>

An enumeration of unique cache entry keys for the CacheEntryChangeMonitor object.

regionName
Type: System.String

A named region in the cache to which a cache entry can be added. Do not pass a value for this parameter. This parameter is null by default, because the MemoryCache class does not implement regions.

Return Value

Type: System.Runtime.Caching.CacheEntryChangeMonitor
A change monitor that monitors entries in the cache.

ExceptionCondition
NotSupportedException

regionName is not null.

ArgumentNullException

keys is null.

ArgumentException

The number of items in keys is zero.

ArgumentException

An item in the keys collection is null.

The CreateCacheEntryChangeMonitor method creates a CacheEntryChangeMonitor instance. This specialized change monitor is used to monitor the cache entries that are specified in the keys collection and to trigger events when the entries change.

A monitored entry is considered to have changed for any of the following reasons:

  • The key does not exist at the time of the call to the CreateCacheEntryChangeMonitor method. In that case, the resulting CacheEntryChangeMonitor instance is immediately set to a changed state. This means that when code subsequently binds a change-notification callback, the callback is triggered immediately.

  • The associated cache entry was removed from the cache. This can occur if the entry is explicitly removed, if it expires, or if it is evicted to recover memory

.NET Framework

Supported in: 4.6, 4.5, 4
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