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Properties of the Cache Class
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The Cache class provides a few properties and public fields. Table 18-1 lists and describes them all.
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TABLE 18-1
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Cache Class Properties and Public Fields
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Description
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Gets the number of items stored in the cache. Gets the maximum percentage of memory that can be used before the scavenging process starts. The default value is 97. Returns the bytes of memory available to the cache. An indexer property that provides access to the cache item identified by the specified key. A static constant that indicates a given item will never expire. A static constant that indicates sliding expiration is disabled for a given item.
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Property
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Count EffectivePercentagePhysicalMemoryLimit
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EffectivePrivateBytesLimit Item NoAbsoluteExpiration NoSlidingExpiration
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18
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ASP.NET Caching
The NoAbsoluteExpiration field is of the DateTime type and is set to the DateTime.MaxValue date that is, the largest possible date defined in the Microsoft .NET Framework. The NoSlidingExpiration field is of the TimeSpan type and is set to TimeSpan.Zero, meaning that sliding expiration is disabled. I ll say more about sliding expiration shortly. The Item property is a read/write property that can also be used to add new items to the cache. If the key specified as the argument of the Item property does not exist, a new entry is created. Otherwise, the existing entry is overwritten.
Cache["MyItem"] = value;
The data stored in the cache is generically considered to be of type object, whereas the key must be a case-sensitive string. When you insert a new item in the cache using the Item property, a number of default attributes are assumed. In particular, the item is given no expiration policy, no remove callback, and a normal priority. As a result, the item will stay in the cache indefinitely, until programmatically removed or until the application terminates. To specify any extra arguments and exercise closer control on the item, use the Insert method of the Cache class instead.
Methods of the Cache Class
The methods of the Cache class let you add, remove, and enumerate the items stored. Methods of the Cache class are listed and described in Table 18-2.
TABLE 18-2
Cache Class Methods
Description
Adds the specified item to the cache. It allows you to specify dependencies, expiration and priority policies, and a remove callback. The call fails if an item with the same key already exists. The method returns the object that represents the newly added item. Retrieves the value of the specified n item from the cache. The item is identified by key. The method returns null if no item with that key is found. (This method is used to implement the get accessor of the Item property.) Returns a dictionary enumerator object to iterate through all the valid items stored in the cache. Inserts the specified item into the cache. Insert provides several overloads and allows you to specify dependencies, expiration and priority policies, and a remove callback. The method is void and, unlike Add, overwrites an existing item having the same key as the item being inserted. (This method is used to implement the set accessor of the Item property.) Removes the specified item from the cache. The item is identified by the key. The method returns the instance of the object being removed or null if no item with that key is found.
Method
GetEnumerator Insert
Remove
Part IV
Infrastructure of the Application
Both the Add and Insert methods don t accept null values as the key or the value of an item to cache. If null values are used, an exception is thrown. You can configure sliding expiration for an item for no longer than one year. Otherwise, an exception will be raised. Finally, bear in mind that you cannot set both sliding and absolute expirations on the same cached item. Note Add and Insert work in much the same way, but a couple of differences make it
worthwhile to have both on board. Add fails (but no exception is raised) if the item already exists, whereas Insert overwrites the existing item. In addition, Add has just one signature, while Insert provides several overloads.
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