Get a property's value using reflection

Question

Let's say I have several classes that extend from MyAbstractClass each containing their own properties that do not exist on MyAbstractClass. How would I get a property value from one of those classes?

Something like this: (pseudocode)

Method GetPropertyValue(myAbstractClass As MyAbstractClass) As %String 
{
  Set myPropertyValue = myAbstractClass.GetType().GetProperty("MyProperty").GetValue();
  Quit myPropertyValue
}

So far I have this:

Method GetPropertyValue(argBusinessObject As BusinessObject)
{
    // get class name. 
    set className = argBusinessObject.%PackageName()_"."_argBusinessObject.%ClassName()

    set dictionary = ##class(%Dictionary.ClassDefinition).%OpenId(className)
    if (dictionary '= "")
    {
        for index=1:1:dictionary.Properties.Count()
        {
            #dim clsPropDef As %Dictionary.PropertyDefinition
            // Get the property name from the class
            set clsPropDef = dictionary.Properties.GetAt(index)

            if (..PropertyName = clsPropDef.Name) {             
                // we have the property
                // Set the propName so that it gets included
                // now what?
            }
        }
    }
}

Answer 1

Method GetPropertyValue(PropertyName)
{
  Q $PROPERTY(##this,Name)
}

In older versions of Cache you would use $ZOBJPROPERTY instead of $PROPERTY. Apparently prior to version 2010.1.

Answer 2

You don't need to cast types in Cache.

If you need to get a known property, you may use usual syntax:

Set myPropertyValue = myAbstractClass.MyProperty

If you need to get a property which is not known, you may use $property function

Set myPropertyName = "PropertyNumber"_i
Set myPropertyValue = $property(myAbstractClass,myPropertyName)