Export (0) Print
Expand All

ObjectCache.AddOrGetExisting Method (String, Object, CacheItemPolicy, String)

When overridden in a derived class, inserts a cache entry into the cache, specifying a key and a value for the cache entry, and information about how the entry will be evicted.

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

abstract AddOrGetExisting : 
        key:string * 
        value:Object * 
        policy:CacheItemPolicy * 
        regionName:string -> Object


Type: System.String

A unique identifier for the cache entry.

Type: System.Object

The object to insert.

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.

Type: System.String

Optional. A named region in the cache to which the cache entry can be added, if regions are implemented. The default value for the optional parameter is a null reference (Nothing in Visual Basic).

Return Value

Type: System.Object
If a cache entry with the same key exists, the specified cache entry's value; otherwise, a null reference (Nothing in Visual Basic).

The AddOrGetExisting(String, Object, CacheItemPolicy, String) method returns an object value, not a CacheItem object.

.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.

© 2014 Microsoft