HttpContext.Cache Expiration

Question

Is there a way to specify how long data is held in HttpContext.Cache?

Answer 1

You can specify it in the 4th parameter of Cache.Add():

public Object Add(     string key,     Object value,     CacheDependency dependencies,     DateTime absoluteExpiration,  // After this DateTime, it will be removed from the cache     TimeSpan slidingExpiration,     CacheItemPriority priority,     CacheItemRemovedCallback onRemoveCallback ) 

Edit:

If you access the cache via the indexer (i.e. Cache["Key"]), the method that is called uses no expiration and remains in the cache indefinitely.

Here is the code that is called when you use the indexer:

public void Insert(string key, object value) {     this._cacheInternal.DoInsert(true, key, value, null, NoAbsoluteExpiration, NoSlidingExpiration, CacheItemPriority.Normal, null, true); }