private static ExpressionEvaluator GetExpressionEvaluator(IModelNode dataSourceNode, CriteriaOperator criteriaOperator)
{
var typeInfo = dataSourceNode.GetGenericListArgument();
var descendants = ReflectionHelper.FindTypeDescendants(typeInfo);
var propertyDescriptors = descendants.SelectMany(info => info.Members).DistinctBy(info => info.Name).Select(info => new XafPropertyDescriptor(info, info.Name)).Cast <PropertyDescriptor>().ToArray();
var evaluatorContextDescriptor = new EvaluatorContextDescriptorDefault(new PropertyDescriptorCollection(propertyDescriptors));
return(new ExpressionEvaluator(evaluatorContextDescriptor, criteriaOperator, false, XpandModuleBase.Dictiorary.CustomFunctionOperators));
}