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.
Assembly: System.Runtime.Caching (in System.Runtime.Caching.dll)
public: virtual Object^ AddOrGetExisting( String^ key, Object^ value, CacheItemPolicy^ policy, String^ regionName = null ) abstract
Parameters
- key
-
Type:
System::String^
A unique identifier for the cache entry.
- value
-
Type:
System::Object^
The object to insert.
- 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.
- regionName
-
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 null.
Return Value
Type: System::Object^If a cache entry with the same key exists, the specified cache entry's value; otherwise, null.
The AddOrGetExisting(String^, Object^, CacheItemPolicy^, String^) method returns an object value, not a CacheItem object.
Available since 4.0