Introspection invoke with array as parameters

Hello,

I have an issue understanding something using invoke

I have a shared method that take the following as parameters

pWindow as DesktopWindow, pSelectedEntity as User = nil, optional pEntitiesToLoad() as User = nil, optional pEntitiesToExclude() as User = nil, pFilters as Dictionary = nil

I have this method on different classes that I use and I want to invoke this method using introspection but I got illegalCastException regarding the 2 optional arrays

This code does not work

var tClass as Introspection.TypeInfo = GetTypeInfo(User)
if tClass<>nil then
  var tMethods() as Introspection.MethodInfo = tClass.GetMethods()
  for each tMethod as introspection.MethodInfo in tMethods
    if tMethod.IsShared and tMethod.Name = "pick" then
      var tParams() as introspection.ParameterInfo = tMethod.GetParameters()
      var params() as Variant
      params.Add(self)
      params.add(nil)
      params.add(nil)
      params.add(nil)
      params.add(nil)
      tEntity=tMethod.Invoke(nil,params)
      exit
    end if
  next
end if

If I replace some params by this, its working

var params() as Variant
params.Add(self)
params.add(nil)
var tArray(-1) as User
params.add(tArray)
params.add(tArray)
params.add(nil)

but if I replace the array declaration by:

var tArray(-1) as User

It does not work anymore.

I would like to have this code working regardless of the class that I use or is it an issue with introspection?

Thank you

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