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ObjectCache.Add Method (CacheItem, CacheItemPolicy)

When overridden in a derived class, tries to insert 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 virtual bool Add(
	CacheItem item,
	CacheItemPolicy policy
)

Parameters

item
Type: System.Runtime.Caching.CacheItem

The object to add.

policy
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 method overloads are virtual (not abstract) on the ObjectCache class, because the Add method internally calls AddOrGetExisting. This reduces the number of method overloads that a cache implementer has to provide. If a cache implementation does not require any special behavior for the Add method, it can just implement the AddOrGetExisting method overloads.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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