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CacheItemRemovedReason Enumeration

Specifies the reason an item was removed from the Cache.

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

public enum CacheItemRemovedReason

Member nameDescription
DependencyChangedThe item is removed from the cache because the cache dependency associated with it changed.
ExpiredThe item is removed from the cache because it expired.
RemovedThe item is removed from the cache by a Remove method call or by an Insert method call that specified the same key.
UnderusedThe item is removed from the cache because the system removed it to free memory.

This enumeration is used by the CacheItemRemovedCallback delegate to notify your ASP.NET applications when and why an object was removed from the Cache.

The following code example demonstrates a shared Boolean property, itemRemoved, a shared CacheItemRemovedReason enumeration object, reason, and a CacheItemRemovedCallback delegate, onRemove. The latter can be included in an Insert or Add method call. It also defines a method, RemovedCallback, with a signature that matches the CacheItemRemovedCallback delegate. When the RemovedCallback method is called, it changes the itemRemoved property value to true and assigns the reason property value to the reason provided by the CacheItemRemovedReason enumeration.

static bool itemRemoved = false;
static CacheItemRemovedReason reason;
CacheItemRemovedCallback onRemove = null;

public void RemovedCallback(String k, Object v, CacheItemRemovedReason r){
  itemRemoved = true;
  reason = r;
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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