Where should i register by class in dependency injection?

Question

1.22/5 (2 votes)

See more:

I have implemented Dependency Injection,everything works fine.I am just confused where should i
place my Registertype<>() functions in the application?

Posted 17-Dec-13 0:40am

Sumit Bhargav

Updated 18-Dec-13 19:06pm

JoCodes

v3

Add a Solution

Comments

SarveshShukla 17-Dec-13 8:23am

What kind of application your are developing and in which technology?

Sumit Bhargav 17-Dec-13 8:34am

I am developing a web application in .Net technology.

4 solutions

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

SarveshShukla · Answer 1 · 2013-12-17T02:42:00

Solution 1

Normally web.config is used to register all your types with the Unity container and then in Global.asax.cs you can configure your unity container using web config section. Let me know if you need any other detail.

Posted 17-Dec-13 2:42am

SarveshShukla

Comments

Sumit Bhargav 17-Dec-13 8:56am

Thanks for replying,
I know that global.asax file will be used to implement Unity Container.I am confused in the Pattern of implementing it.I don't know how to configure it.

SarveshShukla · Answer 2 · 2013-12-17T18:09:00

Please find the code for configuring Unity container. Also please ensure that you have <unity> section in your web config where you would register your types

Ensure that you take a static container variable so that it is available for all request

C#

public static IUnityContainer container;

Below code should be present in Global.asax.cs Application_Start method

C#

container = new Microsoft.Practices.Unity.UnityContainer();
         
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
            section.Containers.Default.Configure(container);

or if you are not using config use below code to register type

C#

container.RegisterType<interface,class>();

Also add below code in prerequest handler so that your types are build by the container

C#

protected void Application_PreRequestHandlerExecute(object sender, EventArgs e)
{
    IHttpHandler httpHandler = HttpContext.Current.Handler as System.Web.UI.Page;

    if (httpHandler != null)
    {
        if (unityContainer != null)
        {
            unityContainer.BuildUp(httpHandler.GetType(), httpHandler);
        }
    }
}

Web.config changes
Add a new section for unity

XML

<configsections>

		<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />
	</configsections>

and then defines the unity section

XML

<unity>
<containers>
	<container>
		<types>
			<type type="Full Interface Name including Namespace, Assembly Name" mapto="Full class Name including Namespace, Assembly Name">
			</type>
		</types>
	</container>
</containers>
</unity>

Sumit Bhargav · Answer 3 · 2013-12-18T00:38:00

XML

<configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>

XML

<unity>
    <containers>
      <container>
        <types>
          <type type="IBLPotential" mapTo="Website1.App_Code.Potentials.BusinessLogic.BLPotential"></type>
          <type type="IPotentialBinding" mapTo="Website1.App_Code.Potentials.DataAccess.PotentialBinding"></type>
          <type type="IPotentialInfo" mapTo="Website1.App_Code.Potentials.DataAccess.PotentialInfo"></type>
          <type type="IPotentialNew" mapTo="Website1.App_Code.Potentials.DataAccess.PotentialNew"></type>
        </types>
      </container>
    </containers>
  </unity>

This is my web.config unity section.

Sumit Bhargav · Answer 4 · 2013-12-18T18:57:00

Solution 6

This is my web.config file

XML

<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>         
  </configSections>
  <unity>
    <containers>
      <container>
        <types>
          <type type="CRMLibrary.IBLPotential,CRMLibrary" mapTo="CRMLibrary.BLPotential,CRMLibrary"></type>
          <type type="CRMLibrary.IPotentialBinding,CRMLibrary" mapTo="CRMLibrary.PotentialBinding,CRMLibrary"></type>
          <type type="CRMLibrary.IPotentialInfo,CRMLibrary" mapTo="CRMLibrary.PotentialInfo,CRMLibrary"></type>
          <type type="CRMLibrary.IPotentialNew,CRMLibrary" mapTo="CRMLibrary.PotentialNew,CRMLibrary"></type>
        </types>
      </container>
    </containers>
  </unity>

This is my .asax file
void Application_Start(object sender, EventArgs e)
{
// Code that runs on application startup
IUnityContainer Container = new UnityContainer();
UnityConfigurationSection Section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
Section.Containers.Default.Configure(Container);
}

This is what i am doing in a class
UnityContainer IoC = new UnityContainer();
IBLPotential BPotential = IoC.Resolve<iblpotential>();

Posted 18-Dec-13 18:57pm

Sumit Bhargav

Updated 18-Dec-13 18:59pm

v3

Comments

Sumit Bhargav 19-Dec-13 1:00am

Dependency injection has been done and i had implemented interface iblpotential in class blpotential

Sumit Bhargav 19-Dec-13 1:20am

This is what i am doing in a class
UnityContainer IoC = new UnityContainer();
IBLPotential BPotential = IoC.Resolve<iblpotential>();

but it still gives the error

SoMad 19-Dec-13 1:39am

Have you solved your problem? From what you wrote here, it sounds like you are still getting an error. If that is the case, you should not post this as a solution and then accept it as the answer.

Soren Madsen

Sumit Bhargav 19-Dec-13 1:40am

i havn't solved it yet,It's by mistake.sorry

SarveshShukla 19-Dec-13 1:51am

Sumit, This will not work, you have created a container in application_start method but you are not using it for resolving types, instead you are creating a new IOC variable and using it to resolve the dependency.

Just use the code i gave in Solution 2 and then where ever you want your dependency to be injected for any property do this

[Dependency]
IBLPotential potential {get;set;}

Sumit Bhargav 19-Dec-13 2:02am

hi sarvesh,
where do i have to declare the variable?
in a class or in a .asax file?
"public static IUnityContainer container;"

SarveshShukla 19-Dec-13 2:20am

either declare it in Global.asax.cs or any other cs class it does not matters, only thing is you should use the same variable while registering and resolving your types

eg if in global.asax then use it like Global.unitycontainer.Resolve

else it would be YourClass.unitycontainer.Resolve

still this is not the best practice to use dependency injection, instead you should use [Dependency] attribute for property

Sumit Bhargav 3-Jan-14 1:30am

hi sarvesh,
sorry for being silent for a long time,got busy in some other work.
I am actually confused in implementing the global.asax.It contains script tag in it and the other necessary functions like Application_Start.How would i call the Global.asax in other class?
You said to use it like Global.unitycontainer.Resolve
But i dont have any Global class yet in the application it's just global.asax nothing else.

Where should i register by class in dependency injection?

4 solutions

Solution 1

Solution 2

Solution 3

Solution 6

Add your solution here

Preview 0

Where should i register by class in dependency injection?

4 solutions

Solution 1

Solution 2

Solution 3

Solution 6

Add your solution here

Preview 0

Existing Members

...or Join us