How to Inject a Dependency to a Page Class Using Microsoft Unity 2.0?

I have a page with the below property:

    public partial class CustomPage : Page
{
    [Dependency]
    public ILogger Logger { get; set; }

    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write((this.Logger == null) ? "Not initialized" : "Initialized");
    }
}

As can be seen, the ILogger is a dependency which should be injected to this class.

The Unity config file has been configured like this:

<unity>
  <alias alias="ILogger" type="Logging.ILogger, AssemblyName" />
  <alias alias="Logger" type="Logging.Logger, AssemblyName" /> 
  <container>
    <register type="ILogger" mapTo="Logger">
      <lifetime type="singleton"/>
    </register>   
  </container>
</unity>

In m开发者_如何转开发y Global.ascx file, Application_Start event I have the below code:

var container = new UnityContainer();
container.LoadConfiguration();
container.Resolve<CustomPage>();

What I expect is that when the CustomPage runs, the ILogger get injected but the actual behaviour is that it's always null.

How to configure it properly?

Thanks

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Use ASP.NET Page Factory.

You need to add a constructor to your CustomPage class and in the Factory to pass the appropriate arguments.

Yair

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I created a base page class where the property dependency injection happens on Page_PreInit:

public class BasePage<T> : Page where T: class
{
    [Dependency]
    public ILogger Logger { get; set; }

    protected void Page_PreInit(object sender, EventArgs args)
    {
        ((IContainerAccessor)HttpContext.Current.ApplicationInstance).Container.BuildUp<T>(this as T);
    }
    }

No need to have a separate handler.

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You can write a HttpModule and handle one of the pre-request events which are fired per request and after your page is created. This is the spot you need to inject your properties.