unable ban vigilant form 'system.object[]' 'myobject[]', gives?

scenario:

i'm now minute covering summary 3 identical webservices useable class. any webservice exposes set objects share commonality. i have combined set surrogate objects feat commonality. however covering i need modify between web use objects objects.

i've used tact emanate suitable form during run before i web use so:

    open stationary object[] createproperties(type type, iproperty[] properties)
    {
        //empty relapse null
        (properties==null || properties.length == 0)
            relapse null;

        //check form allowed
        checkpropertytypes("createproperties(type,iproperty[])",type);

        //convert array surrogate iproperty objects into
        // upheld use form e.g. service1.property
        object[] outcome = new object[properties.length];
        (int i = 0; i < properties.length; i++)
        {
            iproperty fromprop = properties[i];
            vigilant toprop = reflectionutility.createinstance(type, null);
            serviceutils.copyproperties(fromprop, toprop);
            result[i] = toprop;
        }
        relapse result;
    }

here's job code, use implementations:

property[] props = (property[])objectfactory.createproperties(typeof(property), properties);
_service.setproperties(folderitem.path, props);

so any use exposes opposite "property" vigilant i bury behind possess doing iproperty interface.

the tact formula works section tests producing an array objects whose elements suitable type. nonetheless job formula fails:

system.invalidcastexception: amateurish to
ban vigilant form 'system.object[]'
type
'myproject.property[]

any ideas?

i underneath sense any ban vigilant work enlarged contained vigilant convertable?