private ProjectionModification CreateMethodCallExpression(ParameterExpression parameter, List <IRelatedBinding> relatedBindings, List <IUnprojectedBinding> unprojectedBindings)
{
//We will create an AnonymousType(this type is part of AgileFx), to hold the new projection.
var typeArgs = new List <Type>();
typeArgs.Add(queryableType.NonPrimitiveEnumerableItemType.TranslatedType);
relatedBindings.ForEach(binding => typeArgs.Add(binding.TranslatedType));
var anonType = typeTranslationUtil.GetAnonymousType(typeArgs.ToArray());
var ctor = anonType.GetConstructor(Type.EmptyTypes);
var newExpression = Expression.New(ctor);
//Fields in the Projected Type
var fieldsInProjectedType = new Dictionary <MemberInfo, SimpleType>();
//The first field is the original type. This goes in as Field0.
fieldsInProjectedType.Add(anonType.GetProperties()[0], queryableType.NonPrimitiveEnumerableItemType);
var memberBindings = new List <MemberBinding>();
//The first field is the original type. This goes in as Field0.
memberBindings.Add(Expression.Bind(anonType.GetProperties()[0], parameter));
int propCounter = 1;
var anonTypeProperties = anonType.GetProperties();
foreach (var binding in relatedBindings)
{
var propInfo = anonTypeProperties[propCounter];
memberBindings.Add(Expression.Bind(propInfo, binding.TranslatedExpression));
fieldsInProjectedType.Add(propInfo, null);
propCounter++;
}
var memberInit = Expression.MemberInit(newExpression, memberBindings);
var lambda = Expression.Lambda(memberInit, parameter);
var projectedType = new ProjectedType(queryableType.NonPrimitiveEnumerableItemType.Type, anonType, ctor, null, fieldsInProjectedType,
relatedBindings, unprojectedBindings);
Func <IQueryable <object>, Expression <Func <object, object> >, IQueryable <object> > f = Queryable.Select;
var selectMethod = f.Method.GetGenericMethodDefinition().MakeGenericMethod(queryableType.NonPrimitiveEnumerableItemType.TranslatedType, anonType);
var mce = Expression.Call(null, selectMethod, currentExpression, lambda);
return(new ProjectionModification {
ModifiedExpression = mce, QueryableType = RuntimeTypes.CreateEnumerable(projectedType)
});
}
