MEF's Asp.net Hello World Program

1. Learn about MEF
2. Simple demo
3.CodeDownload

1. Learn about MEF
 
MEF is an open-source project on codeplex. Address: http://mef.codeplex.com/, project objective: simplifying the design of extensible applications and components.

2. Simple demo

2.1 create an Asp.net web application and add the system. componentmodel. Composition application.

2.2 Add a web form page aspnetmefbasic. aspx. The background code is as follows:

Using System;
Using System. Collections. Generic;
Using System. LINQ;
Using System. Web;
Using System. Web. UI;
Using System. Web. UI. webcontrols;

NamespaceMEF
{
UsingSystem. componentmodel. composition;
UsingSystem. componentmodel. Composition. Hosting;

Public Partial ClassAspnetmefbasic: system. Web. UI. Page
{
[Import]
Class1 C1;

Protected   Void Page_load ( Object Sender, eventargs E)
{
// Step 1:
// Find the Assembly (. dll) that has the stuff
// We need (I. e. [Export] Ed stuff) and put it in our catalog
Directorycatalog catalog =  
New Directorycatalog (system. Io. Path. Combine (appdomain. currentdomain. basedirectory, " Bin " ));

// Step 2:
// To do anything with the stuff in the catalog, we need
// Put into a container (which has methods to do the magic stuff)
Compositioncontainer container =  
New Compositioncontainer (Catalog );

//Step 3:
//Now lets do the magic bit-wiring everything up
Container. composeparts (This);

//Step 4:
//Lets see if it works
Div1.innertext=C1.s1;
}
}

} 

2.3 Add a class class1 with the following code:

 Using  System;
 Using  System. Collections. Generic;
  Using  System. LINQ;
  Using  System. Web;

  Namespace  MEF
{
  Using  System. componentmodel. composition;

[Export]
  Public     Class  Class1
{
  Public    String  S1  =     "  Hello World  "  ;  
  }
} 

2.4 run the aspnetmefbasic. aspx webpage. The result is as follows:

3. Download Code

/Files/xuqiang/mef.rar