Cheap Silverlight 4 Hosting :: Configure an AuthenticationDomainService using Ria Services Class Library

Using a Ria Services Class library to collect DomainServices and DomainContexts in

a solution is a good practice because everyone know the value of having classes separated in projects instead of having them in the web project.

To workaround to this problem you may simply write by hand this class and put it in the client side part of the Ria Services library project. The code can be copied by an AuthenticationDomainContext generated in the web project but it is very simple and we show you the code here:

public sealed partial class RiaContext : System.Windows.Ria.RiaContextBase

{

#region Extensibility Method Definitions

partial void OnCreated();

#endregion

public RiaContext()

{

this.OnCreated();

}

public new static RiaContext Current

{

get

{

return ((RiaContext)(System.Windows.Ria.RiaContextBase.Current));

}

}

public new User User

{

get

{

return ((User)(base.User));

}

}

}

With this class you can configure the Authentication Domain Context as you did with the generated class. So you have to add it to the App.config, in the ApplicationLifetimeObjects tag and then add a kind of authentication like the WindowsAuthentication and FormsAuthentication.

The second drawback is that if you run the project this way and then you call the Login() method (or any other method) of the RiaContext you will get an error:

The DomainContextType is null or invalid and there are no contexts generated from AuthenticationBase

This probably come from the fact that the RiaContext is not correctly initializated so when the class search for a valid domaincontext to handle the Login call it fails because it does not find it. The tip to correct this behavior is to specify the DomainContext property in the Authentication you have choosed. Here is how to change the App.xaml file:

As you can see you have simply to give an instance of the generated Authentication Domain context class to the FormsAuthentication (or Windows Authentication as well). The RiaContext need to have this instance to make the calls to the BL methods in the Domain Service.

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Cheap Silverlight 4 Hosting :: Configure an AuthenticationDomainService using Ria Services Class Library

By: dotnetgeek

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