ASP.NET.in.a.Nutshell.Second.Edition [Electronic resources] نسخه متنی

This interface is required to process HTTP requests.
It's implemented by the
System.Web.UI.Page and
HttpApplication classes, but you can use
IHttpHandler to create a custom HttpHandler for a
lower-level programming model. You can still access the
HttpContext object (and, through its properties,
built in objects like HttpRequest and
HttpResponse), but you cannot use the higher-level
Page abstraction. Common uses of handlers include
filters and CGI-like applications, especially those returning binary
data.

When using the IHttpHandler interface, you must
implement the ProcessRequest( ) method and
IsReusable property. The ProcessRequest(
) method receives an HttpContext object,
which gives you access to ASP.NET's built-in
objects. Use the IsReusable property to declare
whether a single instance of your handler can serve multiple
requests.

You will also need to modify <httphandlers>
section of the web.config file to make your
custom handler a target for HTTP requests. You can map requests based
on the requested page, file type, or HTTP method (GET, PUT, or POST).
If you want to create a handler that can process all requests, you
should create a custom HttpModule using the
IHttpModule interface.

public interface 
IHttpHandler  {
// Public Instance Properties
public bool 
IsReusable {get; }
// Public Instance Methods
public void 
ProcessRequest (HttpContext 
context );
}

Implemented By

HttpApplication,
IHttpAsyncHandler,
System.Web.Services.Discovery.DiscoveryRequestHandler,
System.Web.UI.Page

Returned By

HttpContext.Handler,
IHttpHandlerFactory.GetHandler( ),
System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(
),
System.Web.UI.PageParser.GetCompiledPageInstance(
)

Passed To

HttpContext.Handler,
IHttpHandlerFactory.ReleaseHandler( ),
System.Web.Services.Protocols.WebServiceHandlerFactory.ReleaseHandler(
)