The Unity Application Block (i.e. Unity) is a lightweight, extensible dependency injection container for .NET with support for interception.

The Unity Application Block (i.e. Unity Container) is a lightweight, extensible dependency injection container for .NET. It also supports interception.

Unity targets both .NET CLR and Silverlight.

Installing Unity can most easily be done using its NuGet package:

Install-Package Unity

More information at:

Hello world in c#

interface IMessageWriter 
{
    void WriteMessage(string message);
}

class ConsoleWriter : IMessageWriter 
{
    public void WriteMessage(string message) 
    { 
        Console.WriteLine(message); 
    }
}

class HelloWorldService 
{
    private readonly IMessageWriter _writer;

    public HelloWorldService(IMessageWriter writer) 
    {
       _writer = writer;
    }

    public void Go() 
    {
       _writer.WriteMessage("Hello World!");
    }
}

using (var container = new UnityContainer()) 
{        
    container.RegisterType<IMessageWriter, ConsoleWriter>();

    var helloWorldService = container.Resolve<HelloWorldService>();

    helloWorldService.Go();    
}
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