Ejemplo de HttpModule personalizado

El siguiente módulo personalizado simplemente devuelve un mensaje de página Web al principio de cualquier solicitud HTTP y otro después de procesarse la solicitud. La función Init siguiente registra controladores para dos eventos HttpApplication, BeginRequest y EndRequest. Cada controlador se escribe como un método privado del modulo. Cuando se provocan los eventos registrados, ASP.NET llama al método de controlador apropiado, que escribe una página Web y termina.

using System;
using System.Web; 
using System.Collections;

public class HelloWorldModule : IHttpModule {
    public String ModuleName { 
        get { return "HelloWorldModule"; } 
    }    
    
    // In the Init function, register for HttpApplication 
    // events by adding your handlers.
    public void Init(HttpApplication application) {
        application.BeginRequest += (new EventHandler(this.Application_BeginRequest));
        application.EndRequest += (new EventHandler(this.Application_EndRequest));
    }
    
    // Your BeginRequest event handler.
    private void Application_BeginRequest(Object source, EventArgs e) {
        HttpApplication application = (HttpApplication)source;
        HttpContext context = application.Context;
        context.Response.Write("<h1><font color=red>HelloWorldModule: Beginning of Request</font></h1><hr>");
    }
    
    // Your EndRequest event handler.
    private void Application_EndRequest(Object source, EventArgs e) {
        HttpApplication application = (HttpApplication)source;
        HttpContext context = application.Context;
        context.Response.Write("<hr><h1><font color=red>HelloWorldModule: End of Request</font></h1>");
    }        
    
    public void Dispose() 
    {
    }
}

[Visual Basic]
Imports System
Imports System.Web
Imports System.Collections

Public Class HelloWorldModule
    Implements IHttpModule

    Public ReadOnly Property ModuleName() As [String]
        Get
            Return "HelloWorldModule"
        End Get
    End Property

    ' In the Init function, register for HttpApplication 
    ' events by adding your handlers.
    Public Sub Init(ByVal application As HttpApplication) Implements IHttpModule.Init
        AddHandler application.BeginRequest, AddressOf Me.Application_BeginRequest
        AddHandler application.EndRequest, AddressOf Me.Application_EndRequest
    End Sub

    ' Your BeginRequest event handler.
    Private Sub Application_BeginRequest(ByVal [source] As [Object], ByVal e As EventArgs)
        Dim application As HttpApplication = CType([source], HttpApplication)
        Dim context As HttpContext = application.Context
        context.Response.Write("<h1><font color=red>HelloWorldModule: Beginning of Request</font></h1><hr>")
    End Sub

    ' Your EndRequest event handler.
    Private Sub Application_EndRequest(ByVal [source] As [Object], ByVal e As EventArgs)
        Dim application As HttpApplication = CType([source], HttpApplication)
        Dim context As HttpContext = application.Context
        context.Response.Write("<hr><h1><font color=red>HelloWorldModule: End of Request</font></h1>")
    End Sub

    Public Sub Dispose() Implements IHttpModule.Dispose
    End Sub
End Class

Registre el módulo de la siguiente manera:

<configuration>
    <system.web>
        <httpModules>
            <!-- <add name="HelloWorldModule" 
                      type="HelloWorldModule, HelloWorldModule" /> -->
        </httpModules>
    </system.web>
</configuration>

Vea también

Compatibilidad con el motor de tiempo de ejecución para HTTP | HttpModules Controlar eventos públicos | Controlar y provocar eventos