Asp.NET Handlers and Modules
- 1. ASP.NET Handlers & Modules Session Time: 30-45minutes By: Sunil Pottumuttu
- 2. Agenda • Introduction • The Problem • Extension Based Preprocessor • Event Based Preprocessor • Overall Picture • Steps to Implement • The Final Output
- 3. IIS & ASP.NET Request Workflow IIS IIS Application *.asmx aspnet_isapi.dll HTTP Machine.config Web.config Request *.asp asp.dll HTTP Process Request Response
- 4. ASP.NET Configuration • Machine.config defines default handlers or handler factories to manage requests • Web.config may alter Machine.config settings at the application level
- 5. Machine.config Overrides Web.config <httpHandlers> <add verb="*" path="*.aspx" type="System.Web.UI.PageHandlerFactory"/> <add verb="*" path="*.asmx" type="System.Web.Services.Protocols.WebServiceHandlerFactory, System.Web.Services, …/> <add verb="*" path="*.soap" type="System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFac tory, System.Runtime.Remoting, …/> <add verb="*" path="*.config" type="System.Web.HttpForbiddenHandler"/> </httpHandlers> <httpHandlers> <add verb=“GET" path="*.xml" type=“DotNetDashboard.Web.FileDownloadHandler, DotNetDashboard.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxx"/> <add verb="*" path=“displayImage.aspx" type=“DotNetDashboard.Web.ImageFormatter, DotNetDashboard.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxx” /> <add verb="*" path=“*.xls” type="System.Web.HttpForbiddenHandler"/> </httpHandlers>
- 6. HttpHandler - The Extension Based Preprocessor
- 7. HttpModule - Event Based Preprocessor
- 8. Hook to the Events
- 10. Some Handlers
- 11. IIS 7 – Handler Mappings & Demo
- 12. IIS 7 – Http Modules & Demo
- 13. Synchronous vs Asnchronous • synchronous request, the ProcessRequest method is executed, and any markup produced is sent to the browser once the entire request is processed • BeginProcessRequest and the EndProcessRequest
- 14. Virtual File Provider • Global.asax provides hooks into the events of the ASP.NET pipeline just like an httpModule • Global.asax provides is the capability to add handlers to events not available to modules, like Session_Start and Session_End. • httpModules have over Global. asax is the ability to compile modules into class libraries that can be used in multiple ASP.NET web sites
- 15. Modules vs Global.asax • synchronous request, the ProcessRequest method is executed, and any markup produced is sent to the browser once the entire request is processed • BeginProcessRequest and the EndProcessRequest
- 16. Imp Http Modules Events • BeginRequest • AuthenticateRequest • AuthorizeRequest • EndRequest • Error
- 17. Demo Material