ObjectCache.AddOrGetExisting Method
Definition
Important
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When overridden in a derived class, tries to insert a cache entry into the cache, and returns an existing cache entry with a matching key.
Overloads
| AddOrGetExisting(CacheItem, CacheItemPolicy) |
When overridden in a derived class, inserts the specified CacheItem object into the cache, specifying information about how the entry will be evicted. |
| AddOrGetExisting(String, Object, DateTimeOffset, String) |
When overridden in a derived class, inserts a cache entry into the cache, by using a key, an object for the cache entry, an absolute expiration value, and an optional region to add the cache into. |
| AddOrGetExisting(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. |
Remarks
The AddOrGetExisting method overloads insert an entry into the cache. If a cache entry with a matching key already exists, they return the existing entry. The cache entry can be a CacheItem object or a generic object.
There is one difference between the AddOrGetExisting overloads and the Add overloads. When these overloaded methods try to insert a cache entry, if an existing entry is found that has a key that matches an existing inserted cache entry, the AddOrGetExisting overloads return the existing cache entry. The Add overloads do not.
AddOrGetExisting(CacheItem, CacheItemPolicy)
- Source:
- ObjectCache.cs
- Source:
- ObjectCache.cs
When overridden in a derived class, inserts the specified CacheItem object into the cache, specifying information about how the entry will be evicted.
public:
abstract System::Runtime::Caching::CacheItem ^ AddOrGetExisting(System::Runtime::Caching::CacheItem ^ value, System::Runtime::Caching::CacheItemPolicy ^ policy);public abstract System.Runtime.Caching.CacheItem AddOrGetExisting (System.Runtime.Caching.CacheItem value, System.Runtime.Caching.CacheItemPolicy policy);abstract member AddOrGetExisting : System.Runtime.Caching.CacheItem * System.Runtime.Caching.CacheItemPolicy -> System.Runtime.Caching.CacheItemPublic MustOverride Function AddOrGetExisting (value As CacheItem, policy As CacheItemPolicy) As CacheItemParameters
- value
- CacheItem
The object to insert.
- policy
- CacheItemPolicy
An object that contains eviction details for the cache entry. This object provides more options for eviction than a simple absolute expiration.
Returns
If a cache entry with the same key exists, the specified cache entry; otherwise, null.
Applies to
AddOrGetExisting(String, Object, DateTimeOffset, String)
- Source:
- ObjectCache.cs
- Source:
- ObjectCache.cs
When overridden in a derived class, inserts a cache entry into the cache, by using a key, an object for the cache entry, an absolute expiration value, and an optional region to add the cache into.
public abstract object AddOrGetExisting (string key, object value, DateTimeOffset absoluteExpiration, string regionName = default);abstract member AddOrGetExisting : string * obj * DateTimeOffset * string -> objPublic MustOverride Function AddOrGetExisting (key As String, value As Object, absoluteExpiration As DateTimeOffset, Optional regionName As String = Nothing) As ObjectParameters
- key
- String
A unique identifier for the cache entry.
- value
- Object
The object to insert.
- absoluteExpiration
- DateTimeOffset
The fixed date and time at which the cache entry will expire.
- regionName
- 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 null.
Returns
If a cache entry with the same key exists, the specified cache entry's value; otherwise, null.
Remarks
This AddOrGetExisting(String, Object, DateTimeOffset, String) method overload returns an object value, not a CacheItem object.
Applies to
AddOrGetExisting(String, Object, CacheItemPolicy, String)
- Source:
- ObjectCache.cs
- Source:
- ObjectCache.cs
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.
public abstract object AddOrGetExisting (string key, object value, System.Runtime.Caching.CacheItemPolicy policy, string regionName = default);abstract member AddOrGetExisting : string * obj * System.Runtime.Caching.CacheItemPolicy * string -> objPublic MustOverride Function AddOrGetExisting (key As String, value As Object, policy As CacheItemPolicy, Optional regionName As String = Nothing) As ObjectParameters
- key
- String
A unique identifier for the cache entry.
- value
- Object
The object to insert.
- policy
- CacheItemPolicy
An object that contains eviction details for the cache entry. This object provides more options for eviction than a simple absolute expiration.
- regionName
- 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 null.
Returns
If a cache entry with the same key exists, the specified cache entry's value; otherwise, null.
Remarks
The AddOrGetExisting(String, Object, CacheItemPolicy, String) method returns an object value, not a CacheItem object.
