This documentation is archived and is not being maintained.

MemoryCache::Set Method (String, Object, DateTimeOffset, String)

Inserts a cache entry into the cache by using a key and a value and specifies time-based expiration details.

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

public:
virtual void Set(
	String^ key, 
	Object^ value, 
	DateTimeOffset absoluteExpiration, 
	String^ regionName
) override

Parameters

key
Type: System::String
A unique identifier for the cache entry to insert.
value
Type: System::Object
The data for the cache entry.
absoluteExpiration
Type: System::DateTimeOffset
The fixed date and time at which the cache entry will expire.
regionName
Type: System::String
A named region in the cache to which a cache entry can be added. Do not pass a value for this parameter. This parameter is nullptr by default, because the MemoryCache class does not implement regions.

ExceptionCondition
NotSupportedException

regionName is not nullptr.

ArgumentNullException

key is nullptr.

-or-

Value is nullptr.

ArgumentException
  • An invalid combination of arguments for the cache entry was passed. This occurs if the following expiration details are set on the policy object for the cache entry:

  • If both the absolute and sliding expiration values on CacheItemPolicy object are set to values other than the defaults of InfiniteAbsoluteExpiration and NoSlidingExpiration. This occurs because the MemoryCache class does not support expiring entries based on both an absolute and a sliding expiration. Only one expiration setting can be explicitly set when you use the MemoryCache class. The other setting must be set to InfiniteAbsoluteExpiration or NoSlidingExpiration.

  • If both the removal callback and the update callback are specified on CacheItemPolicy object. The MemoryCache class only supports using one type of callback per cache entry.

ArgumentOutOfRangeException

The SlidingExpiration property is set to a value less than Zero.

-or-

The SlidingExpiration property is set to a value greater than one year.

-or-

Like other Set method overloads, the Set method always puts a cache value in the cache, regardless whether an entry already exists with the same key. If the specified entry does not exist, a new cache entry is inserted. If the specified entry exists, it is updated.

The absoluteExpiration parameter indicates when the entry should be removed from the cache.

Removing an entry triggers any associated change monitors. If the removed item was associated with a CacheItemUpdateCallback object or CacheItemRemovedCallback object, the reason for removal that is passed to the callbacks is contained in the Removed property.

.NET Framework

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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