internal void Initialize()
{
if (expression != null)
{
var modelExpression = DeclaringType.GetExpression(PropertyType, expression);
// Expressions that do not require root instances (like static properties or constant expressions)
if (modelExpression.CompiledExpression.Method.GetParameters().Length == 0)
{
calculation = i => modelExpression.CompiledExpression.DynamicInvoke();
}
// Expressions requiring a root instance
else
{
calculation = i => modelExpression.CompiledExpression.DynamicInvoke(i);
}
}
}