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<system.web> <browserCaps provider="Samples.CustomProvider, Samples" /> </system.web>
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The browser provider usually derives from the system-provided base class HttpCapabilitiesProvider and extends it by overriding some methods.
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The <caching> Section
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The <caching> section configures the cache settings for an ASP.NET application. It consists of four child sections: cache, outputCache, outputCacheSettings, and sqlCacheDependency. The <cache> section defines a few application-wide settings that relate to caching. For example, the percentagePhysicalMemoryUsedLimit and privateBytesLimit attributes indicate the maximum size of memory (percentage and bytes) that can be occupied before the cache starts flushing expired items and attempting to reclaim memory. Here s the schema of the section with default values:
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<cache disableMemoryCollection = "false" disableExpiration = "false" privateBytesLimit = "0" percentagePhysicalMemoryUsedLimit = "89" privateBytesPollTime = "00:02:00" />
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3 ASP.NET Configuration
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The default time interval between polling for the memory usage is 2 minutes. Note that by setting the disableExpiration attribute you can disable the automatic scavenging of expired cache items the most defining trait of ASP.NET cache. The <outputCache> section takes care of output caching. Here is the schema of the section with default values:
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<outputCache defaultProvider="AspNetInternalProvider" enableOutputCache = "true" enableKernelCacheForVaryByStar = "false" enableFragmentCache = "true" sendCacheControlHeader = "true" omitVaryStar = "false"> </outputCache>
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If output or fragment caching is disabled in the configuration file, no pages or user controls are cached regardless of the programmatic settings. The sendCacheControlHeader attribute indicates whether the cache-control:private header is sent by the output cache module by default. Similarly, the omitVaryStar attribute enables or disables sending an HTTP Vary: * header in the response. The enableKernelCacheForVaryByStar attribute controls whether kernel caching is enabled or not. You should note that kernel caching is supported only for compressed responses. This means that regardless of the attribute s value, kernel caching won t work any time the client requests an uncompressed response. The defaultProvider attribute indicates the component that takes care of storing and serving the cached output. The default provider is based on the same code that powered output caching in earlier versions of ASP.NET. The store is the in-memory cache. By writing your own provider, you can change the storage of the output cache. Note that the AspNetInternalProvider provider name doesn t really match any class in the system.web assembly. It is simply a moniker that instructs the system to go with the built-in logic that worked for any previous versions of ASP.NET. The framework offers a new abstract class OutputCacheProvider that represents your starting point on the way to building custom output cache providers. The <outputCacheSettings> section contains groups of cache settings that can be applied to pages through the @OutputCache directive. The section contains only one child section, named <outputCacheProfiles>. An output cache profile is simply a way of referencing multiple settings with a single name. Here s an example:
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<outputCacheSettings> <outputCacheProfiles> <add name="ServerOnly" duration="60" varyByCustom="browser" /> </outputCacheProfiles> </outputCacheSettings>
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Part I The ASP.NET Runtime Environment
In the example, the ServerOnly profile defines a cache duration of 60 seconds and stores different versions of the page based on browser type. Here is the schema of <outputCacheProfiles>:
<outputCacheProfiles> <add name = "" enabled = "true" duration = "-1" location = "" sqlDependency = "" varyByCustom = "" varyByControl = "" varyByHeader = "" varyByParam = "" noStore = "false"/> </outputCacheProfiles>
A database dependency is a special case of custom dependency that consists of the automatic invalidation of some cached data when the contents of the source database table changes. In ASP.NET, this feature is implemented through the SqlCacheDependency class. The <sqlCacheDependency> section defines the settings used by the SqlCacheDependency class when using database caching and table-based polling against versions of Microsoft SQL Server equal or newer than version 7.
<sqlCacheDependency enabled="true" pollTime="1000"> <databases> <add name="Northwind" connectionStringName="LocalNWind" /> </databases> </sqlCacheDependency>
The pollTime attribute indicates (in milliseconds) the interval of the polling. In the preceding sample, any monitored table will be checked every second. Under the <databases> node, you find a reference to monitored databases. The name attribute is used only to name the dependency. The connectionStringName attribute points to an entry in the <connectionStrings> section of the web.config file and denotes the connection string to access the database. Which tables in the listed databases will really be monitored depends on the effects produced by another tool aspnet_regsql.exe. I ll return to this form of caching in 18, ASP.NET Caching. Any values stored in the <sqlCacheDependency> section have no effect when using SqlCacheDependency in conjunction with query notifications on SQL Server 2005 and newer versions.
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