MemoryCache.Add Method (CacheItem, CacheItemPolicy)

.NET Framework (current version)

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Inserts a cache entry into the cache as a CacheItem instance, and adds details about how the entry should be evicted.

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

public override bool Add(
	CacheItem item,
	CacheItemPolicy policy


Type: System.Runtime.Caching.CacheItem

The object to add.

Type: System.Runtime.Caching.CacheItemPolicy

An object that contains eviction details for the cache entry. This object provides more options for eviction than a simple absolute expiration.

Return Value

Type: System.Boolean

true if insertion succeeded, or false if there is an already an entry in the cache that has the same key as item.


The Add and AddOrGetExisting method overloads do not support the UpdateCallback property. Therefore, to set the UpdateCallback property for a cache entry, use the Set method overloads instead.

.NET Framework
Available since 4.5
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