1 Accessing the dictionary directly
2 Using a Dictionary Adapter

Using Nullables

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You can exploit the nullables support of .NET 2.0 to make your code more readble and maintainable.

Accessing the dictionary directly

Assuming we want to be able to access a session variable named "UserId", and that we need to make sure that the value exists before reading it. With direct access to the Session dictionary, the code would look something like that:


...
if (Session["UserId"] != null)
{
    int UserId = (int)Session["UserId"];
    someService.DoImportantStuffOn(UserId);
}
...

Using a Dictionary Adapter

Now let's do te same using the Dictionary Adapter.

First, we have to declare the interface. This time we'd use a nullable int.


public interface IUserIdAware
{
    int UserId? { get; set; }
}

Now we can use the adapter to get a cleaner access:


...
IUserIdAware TypedSession = new DictionaryAdapterFactory().GetAdapter<IUserIdAware>(Session);
if (TypedSession.UserId.HasValue)
    someService.DoImportantStuffOn(TypedSession.UserId.Value);
...

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Using Nullables

Accessing the dictionary directly

Using a Dictionary Adapter