private MemberBinding ToMemberBinding(Expression it, SelectClause selectClause)
{
Expression navigationProperty = Expression.MakeMemberAccess(it, _navigationProperty);
if (_isCollection)
{
// NavigationProperty = it.NavigationProperty.Select( arg => new Item { ... } ).ToArray()
// NavigationProperty = it.NavigationProperty.Select( arg => new Item { ... } ).ToList()
// apply all constraints
if (Select != null)
{
navigationProperty = Select.ApplyTo(navigationProperty);
}
if (Orderby != null)
{
navigationProperty = Orderby.ApplyTo(navigationProperty);
}
if (Filter != null)
{
navigationProperty = Filter.ApplyTo(navigationProperty);
}
if (Skip != null)
{
navigationProperty = Skip.ApplyTo(navigationProperty, ItemType);
}
if (Top != null)
{
navigationProperty = Top.ApplyTo(navigationProperty, ItemType);
}
// build proper select of properties
var expression = BuildSelectLambdaExpression(ItemType, selectClause, NestedExpands);
navigationProperty = Expression.Call(null,
SelectInfo.MakeGenericMethod(ItemType, ItemType),
navigationProperty,
expression
);
// add ToList/ToArray
var loadFunction = _navigationProperty.PropertyType.IsArray
? ToArrayInfo.MakeGenericMethod(ItemType)
: ToListInfo.MakeGenericMethod(ItemType);
navigationProperty = Expression.Call(null,
loadFunction,
navigationProperty
);
}
else
{
// NavigationProperty = new Item { ... }
navigationProperty = BuildMemberInit(ItemType, navigationProperty, selectClause, NestedExpands);
}
return(Expression.Bind(_navigationProperty, navigationProperty));
}
