System.ComponentModel.Composition Example

Daniel Vasquez Lopez — Sat, 07 Nov 2009 01:06:00 GMT

I started playing with the .NET Framework 4.0 composition namespace (also known as MEF) and I want to share the most simple example I could write. The program prints out the providerName field, but the actual value is provided by the ExternalProvider class. The CompositionContainer class is able to wire the ExternalProvider.Name property and the Program.providerName field using the Export and Import attributes.

Add the System.ComponentModel.Composition.dll assembly to your project’s references.

Really simple, I think.

using System;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.Reflection;
class ExternalProvider {
    [Export("ProviderName")]
    public string Name {
        get {
            return "Spider";
        }
    }
}
class Program {
    static void Main() {
        new Program().Run();
    }
    [Import("ProviderName")]
    string providerName;
    void Run() {
        new CompositionContainer(new AssemblyCatalog(Assembly.GetExecutingAssembly())).ComposeParts(this);
        Console.WriteLine(this.providerName);
    }
}

Write your own UI Rewrite Template Extension!

Daniel Vasquez Lopez — Sun, 28 Sep 2008 06:21:00 GMT

The GoLive release of URL Rewrite Module is now available and has a lot of improvement thanks to the IIS Community feedback (and tons of internal brainstorm meetings!). A new feature is the ability to create Rewrite Rules by using Rewrite Templates, Rewrite Templates are UI extensions that help to simplify the creation of rules.

URL Rewrite Module includes 3 templates and more interesting, it allows you to add your own Rewrite Template.

Take a look to the following walkthrough if you haven’t play with Rewrite Templates:

http://learn.iis.net/page.aspx/497/user-friendly-url---rule-template/

I want to show you how easy is to write your own Rewrite Template extension, here is how this demo should look like:

As you know, iis.net has already some good articles that explain how to create an IIS Manager UI Module, so allow me to reuse the following article:

http://learn.iis.net/page.aspx/269/how-to-create-a-simple-iis-manager-module/

Follow the article above and once you are done with it, please do the following changes.

Add the assembly Microsoft.Web.Management.Rewrite.Client.dll to your C# project. If you can’t find the assembly reference in the GAC, download it from here.
Replace the code in DemoModule.cs by the following code that registers your extension in the URL Rewrite UI Module:

using System;
using Microsoft.Web.Management.Client;
using Microsoft.Web.Management.Iis.Rewrite.RewriteTemplates;
using Microsoft.Web.Management.Server;

namespace ExtensibilityDemo
{
internal sealed class DemoModule : Module
{
    protected override void Initialize(IServiceProvider serviceProvider, ModuleInfo moduleInfo)
    {
      base.Initialize(serviceProvider, moduleInfo);

      IExtensibilityManager extensibilityManager = (IExtensibilityManager)
        GetService(typeof(IExtensibilityManager));

      extensibilityManager.RegisterExtension(typeof(RewriteTemplateFeature),
        new DemoRewriteTemplateFeature(this));
    }
}
}

Add a new file named DemoRewriteTemplateFeature.cs and copy and paste following code:

Download the demo from here:

To install it, you will need to GAC the assembly RewriteExtensibilityDemo.dll and register the module in administration.config by adding the following entry under the moduleProviders section:

Daniel Vasquez Lopez's Blog : Extensibility

System.ComponentModel.Composition Example

Write your own UI Rewrite Template Extension!