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PageTypeBuilder with Dynamic properties (updated)

I’m currently working on a project where we started using PageTypeBuilder after a refactoring process. We had some dynamic properties we needed to make available. I therefore made a hack around PTB that includes support for dynamic properties.

The concept is easy. In your top PageType base class you add an attribute. Then you tag up your properties but use Dynamic Property instead of PageTypeProperty

[DynamicPropertyContainer]
public class BasePageData : TypedPageData 
{
    [DynamicProperty]
    public string JavaScript { get; set; }
}

The code will find all class's tagged with DynamicPropertyContainer and find all properties in those classes tagged with DynamicProperty. If it finds 2 properties with the same name it will skip the last one :)

In front code you can of course use

<%=CurrentPage.JavaScript%>

I’,m using the version of PTB that is compailed for CMS 5, so it could maybe be some change in the CMS 6 version. But I needed to copy some code to my own project cause use of internal and private… (sorry couldn’t resist:) ). 

The code is available as 4 cs files, and 1 dll.

Quick Tip

Some times you need to access the property instead of the underline object that PageTypeBuilder returns. So if you make a class like this

public static class ClassInfo<T>
{
    public static string GetName<R>(Expression<Func<T, R>> expr)
    {
        var node = expr.Body as MemberExpression;
        if (object.ReferenceEquals(null, node))
            throw new InvalidOperationException("Expression must be of member access");
        return node.Member.Name;
    }
}

Then you can access the property like this

CurrentPage.Property[ClassInfo<BasePageData>(p=>p.JavaScript)]
Sep 03, 2010

Joel Abrahamsson
(By Joel Abrahamsson, 9/21/2010 12:33:35 PM)

Hi Anders!

You could use the GetPropertyName extension method that ships with PTB to accomplish what you do with the ClassInfo class.

It should also be added that while PTB doesn't support creating dynamic properties you can use it to access their values in a strongly typed way.

For more about why PTB doesn't support adding dynamic properties and how to use it to access their values see http://joelabrahamsson.com/entry/working-with-dynamic-properties-and-page-type-builder.

Guest
(By Guest, 9/21/2010 12:33:35 PM)

Hi Joel

Thanks for the tip on GetPropertyName

The reason for this code is to ensure that the dynamic properties are created. That’s one of the huge benefits of PTB also. That’s way I used the same concept to create the properties.

If PTB should support dynamic properties is totally up to you, but I see benefit of automatically created dynamic properties. I have to say that I also like dynamic properties as a concept, and are not a huge fan of inherit properties thou the page tree.


/ Anders Hattestad

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