Friday, April 6, 2012

Rewrite URL-Implement URL Rewriting in ASP.NET

Reference articles:
  • Tip/Trick: Url Rewriting with ASP.NET by Scott Guthrie - Examines four approaches: 1) Use Request.PathInfo Parameters Instead of QueryStrings; 2) Using an HttpModule to Perform URL Rewriting; 3) Using an HttpModule to Perform Extension-Less URL Rewriting with IIS7; 4) ISAPIRewrite to enable Extension-less URL Rewriting for IIS5 and IIS6; also discusses how to handle ASP.NET postbacks correctly with URL rewriting.
  • URL Rewriting by Salman (CSharpFriends) - simple implementation of URL rewriting logic within the Application_BeginRequest() method of the Global.asax file.
  • Rewrite.NET - A URL Rewriting Engine for .NET by Robert Chartier (15Seconds.com). Solution steps:
    • Create the HttpModule to process the web request and rewrite the URL
    • Add the handler in Web.config
    • Create a configuration section in Web.config to define URL mapping rules
    • Add extensibility by creating a rules engine interface
    • Write class or classes to implement rules engine interface
    • Add code to the HttpModule to dynamically load the desired rules from Web.config
  • URL Rewriting in ASP.NET by Scott Mitchell (MSDN) - examines how to implement URL rewriting in a HTTP module; also explains how to handle postbacks.
  • URL Rewriting with ASP.NET by Richard Birkby (CodeProject) - shows how legacy ASP sites can be upgraded to ASP.NET, while maintaining links from search engines. Solution steps:
    • Create the configuration section in Web.config for defining URL mapping rules
    • Write the configuration section handler class, incorporating the URL rewriting logic
    • Create a call to handler in Global.asax in Application_BeginRequest() method
    • Compile the code and install the rewriter assembly in the Global Assembly Cache (GAC)
    • Configure IIS to map non- .aspx files to the ASP.NET ISAPI extension 

Related posts:

Differences Between IIS URL Rewriting and ASP.NET Routing 
SEO with ASP.NET 4.0 Framework

Related Resources

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