In my model, i use the base class "NamedElement" which defines the Name property for all other classes. This property is browsable and updatable but in a derived class, i want to force this property readonly.

How can i override this attribut ?

Can you explain the use of DomainTypeDescriptor ?

Thank you,

Hi Malain,

DomainTypeDescriptor is currently used to generate code to ADD extra properties to the set exposed on an element (typically seen in the properties grid). You can't use it to override the properties of a base class.

I've raised bugs to this effect, but I don't know whether we'll have time to fix them before V1 now.

You can, however, achieve the same effect in custom code by creating a TypeDescriptionProvider-derived class and attaching it to your derived class. It should return a custom ElementTypeDescriptor-derived class. which has its GetProperties method overridden.

The GetProperties override should call the base GetProperties and then walk the list returned looking for the PropertyDescriptor poining at NamedElement.Name

Replace that PropertyDescriptor instance with your own PropertyDescriptor instance (a class derived from ElementPropertyDescriptor) that has the behavior you want - in this case, you'd return true from IsReadOnly.

A bit long-winded, I'm afraid - this is broadly what the code generator would do for you with a DomainTypeDescriptor. However, using this method does ensure that your objects will behave as you expect in any System.ComponentModel container.

Thank you Claudio,

Yes, i know this is the more "elegant" solution but sometimes the implementation is not trivial and you must do some compromises. (This is a personal opinion)

Kind regards,

Thank you Gareth,

I had seen this but i hoped a more simplest solution.

Just a suggestion
Is it possible to add a property modifier attribute on a domain property ? Then, i can override my property and add some custom attributes in a custom partial code.

I need the same thing with a role definition. I want to initialize a role when it is used for the first time. The best solution is to override the property's accessors in a partial code and for that, i must be able to indicate that the role is virtual.

Thanks.