HttpRequestCachePolicy Class
Defines an application's caching requirements for resources obtained by using HttpWebRequest objects.
Assembly: System (in System.dll)
The HttpRequestCachePolicy type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | HttpRequestCachePolicy() | Initializes a new instance of the HttpRequestCachePolicy class. |
![]() | HttpRequestCachePolicy(DateTime) | Initializes a new instance of the HttpRequestCachePolicy class using the specified cache synchronization date. |
![]() | HttpRequestCachePolicy(HttpRequestCacheLevel) | Initializes a new instance of the HttpRequestCachePolicy class using the specified cache policy. |
![]() | HttpRequestCachePolicy(HttpCacheAgeControl, TimeSpan) | Initializes a new instance of the HttpRequestCachePolicy class using the specified age control and time values. |
![]() | HttpRequestCachePolicy(HttpCacheAgeControl, TimeSpan, TimeSpan) | Initializes a new instance of the HttpRequestCachePolicy class using the specified maximum age, age control value, and time value. |
![]() | HttpRequestCachePolicy(HttpCacheAgeControl, TimeSpan, TimeSpan, DateTime) | Initializes a new instance of the HttpRequestCachePolicy class using the specified maximum age, age control value, time value, and cache synchronization date. |
| Name | Description | |
|---|---|---|
![]() | CacheSyncDate | Gets the cache synchronization date for this instance. |
![]() | Level | Gets the HttpRequestCacheLevel value that was specified when this instance was created. |
![]() | MaxAge | Gets the maximum age permitted for a resource returned from the cache. |
![]() | MaxStale | Gets the maximum staleness value that is permitted for a resource returned from the cache. |
![]() | MinFresh | Gets the minimum freshness that is permitted for a resource returned from the cache. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() | ToString | Returns a string representation of this instance. (Overrides RequestCachePolicy::ToString().) |
You can specify a default cache policy for your application by using the DefaultCachePolicy property or the application or machine configuration files. For more information, see <requestCaching> Element (Network Settings).
You can specify the cache policy for an individual request by using the CachePolicy property.
Caching for Web services is not supported.
The following code example creates a default cache policy for the application domain, and overrides it for a request.
// The following method demonstrates overriding the // caching policy for a request. static WebResponse^ GetResponseNoCache( Uri^ uri ) { // Set a default policy level for the "http:" and "https" schemes. HttpRequestCachePolicy^ policy = gcnew HttpRequestCachePolicy( HttpRequestCacheLevel::Default ); HttpWebRequest::DefaultCachePolicy = policy; // Create the request. WebRequest^ request = WebRequest::Create( uri ); // Define a cache policy for this request only. HttpRequestCachePolicy^ noCachePolicy = gcnew HttpRequestCachePolicy( HttpRequestCacheLevel::NoCacheNoStore ); request->CachePolicy = noCachePolicy; WebResponse^ response = request->GetResponse(); Console::WriteLine( L"IsFromCache? {0}", response->IsFromCache ); return response; }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
