Ii. Understand the operating mechanism of ASP. NET (for example, URL rewriting Based on httphandler)

URL rewriting is to put some articles like article. aspx? Path of ID = 28
Rewrite to article/28 /.

When the user accesses article/28/
We use Asp.net to redirect this request to article. aspx? Id = 28 path
There are two ways to do this.

I. httpmodule-based solution
This solution has some disadvantages. We will discuss the specific disadvantages later.
I once wrote an articleArticle《URL rewriting without components (applicable to larger projects)"
It is written in this mode.

Ii. httphandler-based solution
This example is based on this solution.
Let's take this example.

Iii. httphandlerfactory-based solution
As its name implies, This is a factory that can process requests based on different files.

Let's look at webconfig first, just like webconfig described in the previous section.

<? XML version = "1.0" ?>
< Configuration >
< System. Web >
< Compilation Debug = "True" > </ Compilation >
< Httphandlers >
< Add Verb = "*" Path = "*. Jsp" Type = "Xland. myhandler"   />
</ Httphandlers >
</ System. Web >
</ Configuration >  

Verb indicates one or more of the permitted actions "get", "Post", and "put". The asterisk "*" indicates that all allow
Path allows access to files with the JSP extension
Type specifies the httphandler Processing Method

The following describes the myhandler method.

Using System;
Using System. Collections. Generic;
Using System. Web; // Reference a web namespace
Using System. text;
  Namespace Xland
{
Public   Class Myhandler: ihttphandler // Inherit ihttphandler
{
Public   Void Processrequest (httpcontext context) // Implementation Interface Method
{
String Path = Context. Request. url. pathandquery;
Int Startnum = Path. lastindexof ( ' / ' ) +   1 ;
String Name = Path. substring (startnum );
String [] Parames = Name. Split ( ' - ' );
String Truename =   " / " + Parames [ 0 ] + " . Aspx " + " ? Id = " + Parames [ 1 ]. Replace ( " . Jsp " , "" );
Context. server. Execute (truename );
}
Public   Bool Isreusable // Implementation Interface Method
{
Get { Return   False ;}
}
}
}

My intention is to put a user request like article-49.jsp
Convert to article. aspx? Id = 49
The last sentence is to execute the specified page processing.Program

See article. aspx.

Using System;
Using System. collections;
Using System. configuration;
Using System. DaTa;
Using System. LINQ;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. htmlcontrols;
Using System. Web. UI. webcontrols;
Using System. Web. UI. webcontrols. webparts;
Using System. xml. LINQ;
Namespace _ 1
{
Public   Partial   Class Article: system. Web. UI. Page
{
Protected   Void Page_load ( Object Sender, eventargs E)
{
Response. Write ( " The received ID is "   + Request [ " ID " ]);
}
Protected   Void Button#click ( Object Sender, eventargs E)
{
Response. Write ( " Return successful " );
}
}
}

I made the PostBack event of the button on the page. It can be successfully executed here.

< Httphandlers >
< Add Verb = "*" Path = "*. Jsp" Type = "Xland. myhandler"   />
</ Httphandlers >

The aboveCodeIs to process all. jsp extension files
You can write

< Httphandlers >
  < Add Verb = "*" Path = "* 123.jsp" Type = "System. Web. UI. pagehandlerfactory" Validate = "True"   />
< Add Verb = "*" Path = "*. Jsp" Type = "Xland. myhandler"   />
</ Httphandlers >  

Returning a class of files to Asp.net for processing
Then, you can register ihttphandlerfactory to process the part you want to process.