Looks like Patterns and Practice Group as M$ is coming out with a new Validation Block.

http://blogs.msdn.com/tomholl/archive/2006/11/27/validation-application-block-revealed.aspx

Frans, is there anyway in the future we could possibly have something similar to this build-in to the framework? It would be a very nice flexible option for standard validations and such.

so you could simply say..

if (!entity.IsValid)
{
    MessageBox.Show(entity.BrokenRules.ToString());
}

At least now we could feel alittle more 'Domain-Driven'

KristianP wrote:

so you could simply say..

if (!entity.IsValid)
{
    MessageBox.Show(entity.BrokenRules.ToString());
}

At least now we could feel alittle more 'Domain-Driven'

You can already do:

if (!entity.IsValid)
{
    MessageBox.Show( ((IDataErrorInfo)entity).Error );
}

How is the above better?

BOb

Well, with an object based rule system, things are alot more flexible. Not only can we use encapsulate and re-use common validators, but we can also plug-in our own rules based on certain context at run-time.