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My.Unity.Resolve(Of Ninja)
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I have been attempting to integrate the Unity Application Block into my website to allow me to share the same base object code between a WPF and an ASP.NET application. I will let you know how I am getting along later as I am still knee deep in refactoring, but I have found something a little useful.
I have created a custom “My” object in Visual Studio. This means that I can do “My.Unity.Container” to retrieve my UnityContainer object form anywhere is my code. I know it my be trivial to achieve in other ways, but I am a VB degenerate having fun, so leave me alone…
The first thing we need is a way of consistently creating a singleton instance of our UnityContainer across all of our code in the AppDomain.
1Imports Microsoft.Practices.Unity
2
3Public Class UnityContainer
4 Inherits Microsoft.Practices.Unity.UnityContainer
5
6 Private Shared sm_UnityContainer As Microsoft.Practices.Unity.UnityContainer
7 Private Shared sm_syncRoot As New Object
8
9 Private Sub New()
10 MyBase.New()
11 End Sub
12
13 Public Shared ReadOnly Property Current() As Microsoft.Practices.Unity.UnityContainer
14 Get
15 If (sm_UnityContainer Is Nothing) Then
16 SyncLock sm_syncRoot
17 If (sm_UnityContainer Is Nothing) Then
18 sm_UnityContainer = New UnityContainer
19 'Dim section As UnityConfigurationSection = ConfigurationManager.GetSection("unity")
20 'section.Containers.Default.Configure(sm_UnityContainer)
21 End If
22 End SyncLock
23 End If
24 Return sm_UnityContainer
25 End Get
26 End Property
27
28End Class
I have commented the lines out, but you could also initialise the Unity Container from a config file, but remember that it will be the top level config of your application root an not the config from the Assembly that you code happens to be in.
We could just leave it at that, and If you use C# this is about your lot, but in VB you have the “My” namespace that gives you access to some useful things all in one place.
In order to achieve this you need to create a Module in the “My” namespace that has a single property that access the previous class.
1Imports Common
2
3Namespace My
4
5 <HideModuleName()> _
6 Module MyUnityExtensions
7
8 Friend ReadOnly Property Unity() As UnityContainer
9 Get
10 Return UnityContainer.Current
11 End Get
12 End Property
13
14 End Module
15
16End Namespace
This the allows you to access the UnityContainer object in the same way that you would access My.User.
Inside the Unity object you will have all of the shared properties and methods that we created earlier.
To examine the use of this I have followed O1eg Smirnov ’s Ninja Dependency Injection scenario.
So, I have a Console application that registers a sword type and the resolves out a Ninja Object using Unity.
1Imports NinjaCommon
2
3Module Module1
4
5 Sub Main()
6
7 ' Register Weapon
8 My.Unity.RegisterType(Of IWeapon, Sword)()
9 'Create Ninja
10 Dim ninja = My.Unity.Resolve(Of Ninja)()
11 ' Ninja uses weapon
12 ninja.Weapon.use()
13 ' Create Battle
14 Dim battle As New NinjaClasses.Battle
15 ' Start the fight
16 battle.StartFight()
17
18 Console.ReadKey()
19 End Sub
20
21End Module
But it then instantiates a Battle class from the NinjaClasses assembly which uses it own My.Unity class to access the same UnityContainer object.
1Public Class Battle
2
3 Public Sub New()
4
5 End Sub
6
7 Public Sub StartFight()
8 Console.WriteLine("Fight Starting ")
9 ' Create 10 ninjas and get them to use their weapon.
10 For count = 1 To 10
11 Dim ninja = My.Unity.Resolve(Of NinjaCommon.Ninja)()
12 ninja.Weapon.use()
13 Next
14 Console.WriteLine("Fight ended")
15 End Sub
16
17End Class
Although this example in no way demonstrates the power of the Unity Application Block, and is a bit silly, I think it demonstartes the use of the “My” namespace.
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