1.?????? 利用ItemRemovedCallBack實現緩存中的項的依賴。

private void MyItemRemovedCallBack(string key, object value,

?????????????????? CacheItemRemovedReason reason)

{

??? // remove the item from the cache

??? if (key == "ItemA" ) Cache.Remove("ItemB");

??? else if (key.Equals == "ItemB") Cache.Remove("ItemB");

}

2.?????? Cache dependency on a file.

Cache.Insert("Menu", ds, new System.Web.Caching.CacheDependency(

??????????? Server.MapPath(menuPath)),DateTime.Now.AddMinutes(60),

??????????? TimeSpan.Zero,

??????????? System.Web.Caching.CacheItemPriority.Default,

??????????? new System.Web.Caching.CacheItemRemovedCallback(

????????????????????????????????? CacheItemRemovedCallBack));

3.?????? in asp.net 2.0 we can dependency an item with a databse table.

aspnet_regsql -ed -E -d MyDataBase //enable database to listen to asp.net item which it is Caching.

aspnet_regsql -et -E -d MyDataBase -t MyTable // point out the table caching in cache.

l???????? We need to add these XML to web.config:

<connectionStrings>

??? <add name="ConnectionString"

???????? connectionString="Server=localhost;Database=School;

Trusted_Connection=true"/>

</connectionStrings>

?

<system.web>

??? <caching>

??????? <sqlCacheDependency pollTime="10000" enabled="true" >

??????????? <databases>

??????????????? <add connectionStringName="ConnectionString" name="School"/>

??????????? </databases>

??????? </sqlCacheDependency>

</caching>lt;/caching>

l???????? The Code is :

Cache.Insert("Users", ds, dep);

4.?????? Time-based Dependency

TimeSpan span = new TimeSpan(0,10,0);// ten minute

Cache.Insert("ProductData", LoadDataSet(), nothing, nothing, span)

5.?????? Key-based Dependency

Dim dependency (1) As String dependencyKey(0) = "ProductData" Dim productDataDependency As new CacheDependency(nothing, dependencyKey) Cache.Insert("SalesData", LoadDataSet("Sales"), productDataDependency)

In the above example code, we use the Insert() method to create a new Cache entry named SalesData passing in an instance of a CacheDependency class named productDataDependency which names the Cache key ProductData. Now, whenever ProductData changes, SalesData will be removed from the Cache.

Notice:

Always check if the item exists in the Cache before attempting to use it.

?

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