As an update, this is what I have done to make itwork, but I'd still love to know if there is another way to do this and I'mbarking up the wrong tree ...

So when my application starts, each module willlook in my database store to find if there are any formats registered againstentity properties in their namespace. For each entity and property, a method iscalled on my base entity (the one all IdeaBlade entities inherit from).   This method saves the property name andformat required in a dictionary, and once per entity only adds a propertyinterceptor action for the whole entity. Then finally when a property on the entity is set, the action is calledand it loops through the dictionary and adds verifiers for each of theproperties that need formats.  Then theproperty interceptor action is removed.

Here is example code:  This would be called from Module.Initialize()(hard-coded values for example purposes only)

EntityBaseentity = (EntityBase)Type.GetType("Courier").GetConstructor(new

Type[0]{ }).Invoke(newobject[0] { });

entity.RegisterPropertyInterceptor("Code","^[0-9]{4}$");

entity.RegisterPropertyInterceptor("AccountNumber","^[A-Z]{3}[-][0-9]{2}$");

Then this isinside my EntityBase class:

#region Property Formatting

private Dictionary<string, PropertyFormatting>propertyFormatInterceptorList = new Dictionary<string,PropertyFormatting>();

internal class PropertyFormatting

{

private readonly string format;

private readonly string formatMessage;                

internal PropertyFormatting(stringformat, string formatMessage, bool verifierIsLoaded)

{

this.format = format;

this.formatMessage = formatMessage;

}

internal string Format { get { return this.format; } }

internal stringFormatMessage { get { returnthis.formatMessage; } }

}

public voidRegisterFormatPropertyInterceptor(stringpropertyName, string format, string formatMessage)

{

string entityPropertyInterceptorKey = String.Format("{0}",this.EntityAspect.Entity.ToString());

if(!propertyFormatInterceptorList.ContainsKey(propertyName))

{

if (this.EntityAspect.EntityMetadata.EntityProperties.Where(ep=> ep.Name == propertyName).FirstOrDefault() != null)

{

propertyFormatInterceptorList.Add(propertyName, new PropertyFormatting(format,formatMessage, false));                           

List<PropertyInterceptorAction<PropertyInterceptorArgs<Entity, Object>>>actions = PropertyInterceptorManager.CurrentInstance

.GetActions<PropertyInterceptorArgs<Entity, Object>>(this.GetType(), null,PropertyInterceptorMode.BeforeSet)

.ToList();

if (actions.Where(a => a.Key ==entityPropertyInterceptorKey).FirstOrDefault() == null)

{

PropertyInterceptorManager.CurrentInstance.AddAction(

new PropertyInterceptorAction<PropertyInterceptorArgs<Entity, Object>>(

this.GetType(),

null,

PropertyInterceptorMode.BeforeSet,

new Action<PropertyInterceptorArgs<Entity, Object>>(PropertyFormatInterceptor),

0.0,

entityPropertyInterceptorKey));

}

}

}

}

public voidPropertyFormatInterceptor(PropertyInterceptorArgs<Entity, Object>args)

{

if (args.Instance.EntityAspect.EntityManager != null &&args.Instance.EntityAspect.EntityManager.VerifierEngine != null)

{

// This should only be called once

foreach (varpropertyFormatter in this.propertyFormatInterceptorList)

{

PropertyFormatting propertyFormatting =propertyFormatter.Value;

Verifier formatVerifier = new RegexVerifier(this.GetType(), propertyFormatter.Key, true, new NamedRegexPattern(propertyFormatting.FormatMessage,propertyFormatting.Format));

formatVerifier.VerifierOptions.ShouldExitOnBeforeSetError= true;

formatVerifier.VerifierOptions.ExecutionModes =IdeaBlade.Validation.VerifierExecutionModes.InstanceAndOnBeforeSetTriggers;

args.Instance.EntityAspect.EntityManager.VerifierEngine.AddVerifier(formatVerifier);

}

string entityPropertyInterceptorKey = String.Format("{0}",args.Instance.EntityAspect.Entity.ToString());

List<PropertyInterceptorAction<PropertyInterceptorArgs<Entity, Object>>>actions = PropertyInterceptorManager.CurrentInstance

.GetActions<PropertyInterceptorArgs<Entity, Object>>(this.GetType(), null,PropertyInterceptorMode.BeforeSet)

.ToList();

foreach (var action in actions.Where(a => a.Key ==entityPropertyInterceptorKey))

{

PropertyInterceptorManager.CurrentInstance.RemoveAction(action);

}

}

}

#endregion

I have one finalproblem now, but it's to do with the UI (WPF) not IdeaBlade.  The problem is that a UI textbox is bound tothe entity property.  Now I have the UItext box go red and the tooltip show the validation error message when the usertypes in the wrong thing, BUT the UI will still display what the user has typedin even though the actual entity property is something else.  So if anyone has any answers for this thatwould also be a help :)