HttpCachePolicy.AddValidationCallback Method
.NET Framework 3.0
Registers a validation callback for the current response.
Namespace: System.Web
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
public void AddValidationCallback ( HttpCacheValidateHandler handler, Object data )
public function AddValidationCallback ( handler : HttpCacheValidateHandler, data : Object )
Not applicable.
Parameters
- handler
The HttpCacheValidateHandler value.
- data
The arbitrary user-supplied data that is passed back to the AddValidationCallback delegate.
TheAddValidationCallback method provides a mechanism to check the response programmatically in the cache before the response is returned to the client by the output cache.
Before the response is served from the Web server cache, all registered handlers are queried to ensure resource validity. If any handler sets a flag indicating that the cached response is not valid, the entry is marked as not valid and expelled from the cache. In this case, as well as when any handler indicates that the cached response should be ignored for this request, the request is then handled as if it were a cache miss.
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