URL rewriting / mapping in ASP.Net

URL rewriting or mapping is an important feature of a web application, by which you can give search engine friendly URLs in your application and provide extra security to your application.

following is very simple approach, how to do that-

1) You need to add following section in your Web.config


<system.web>
<urlMappings enabled="true">
<add url="~/fakename.aspx" mappedUrl="~/actualpageurl.aspx" />
<add url="~/Registration.aspx" mappedUrl="~/signup.aspx" />
</urlMappings>
</system.web>


2) Add ASp.Net folder "App_Browsers" in your application







3) Add a new item in that folder as "Form.browser"

Code- Form.browser

<browsers>

<browser refID="Default">
<controlAdapters>
<adapter controlType="System.Web.UI.HtmlControls.HtmlForm"
adapterType="FormRewriterControlAdapter" />
</controlAdapters>
</browser>

</browsers>




4) Create a class file as follows

//Form.cs

using System;
using System.Web.UI;
using System.Web;

public class FormRewriterControlAdapter : System.Web.UI.Adapters.ControlAdapter
{

protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
base.Render(new RewriteFormHtmlTextWriter(writer));
}
}


public class RewriteFormHtmlTextWriter : HtmlTextWriter
{

public RewriteFormHtmlTextWriter(HtmlTextWriter writer)
: base(writer)
{
this.InnerWriter = writer.InnerWriter;
}

public RewriteFormHtmlTextWriter(System.IO.TextWriter writer)
: base(writer)
{
base.InnerWriter = writer;
}

public override void WriteAttribute(string name, string value, bool fEncode)
{

// If the attribute we are writing is the "action" attribute, and we are not on a sub-control,
// then replace the value to write with the raw URL of the request - which ensures that we'll
// preserve the PathInfo value on postback scenarios

if ((name == "action"))
{

HttpContext Context = default(HttpContext);
Context = HttpContext.Current;

if (Context.Items["ActionAlreadyWritten"] == null)
{

// Because we are using the UrlRewriting.net HttpModule, we will use the
// Request.RawUrl property within ASP.NET to retrieve the origional URL
// before it was re-written. You'll want to change the line of code below
// if you use a different URL rewriting implementation.

value = Context.Request.RawUrl;

// Indicate that we've already rewritten the <form>'s action attribute to prevent
// us from rewriting a sub-control under the <form> control

Context.Items["ActionAlreadyWritten"] = true;
}

}


base.WriteAttribute(name, value, fEncode);

}
}


5) Thats all and you are ready to rewrite your incoming URLs without any complex code for HTTP-module
and any actionless form.


IMPORTANT: If you go for Actionless form then it has a side effect that disables page validators.

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