/// <summary>
/// <para> Map all items </para>
/// </summary>
/// <typeparam name="TFrom"> Type to map from </typeparam>
/// <typeparam name="TTo"> Type to map to </typeparam>
/// <param name="from"> Object enumerable to map from </param>
/// <param name="toExpression"> Object collection to map to </param>
/// <param name="match"> Match function to find objects in the 'to' items given a 'from' item </param>
/// <param name="context"> Context </param>
public void MapAll <TFrom, TTo>(
IEnumerable <TFrom> from,
Expression <Func <IEnumerable <TTo> > > toExpression,
Func <TFrom, TTo, bool> match,
IMapperContext context)
where TTo : class
{
if (toExpression == null)
{
throw new ArgumentNullException("toExpression");
}
if (from == null)
{
return;
}
var toMember
= new CollapseMembersExpressionVisitor()
.Modify(toExpression);
var toOriginal = toMember.GetValue();
var toItemType = GetEnumerableElementType(toMember.Type);
var toList = toOriginal as IList;
if (toOriginal == null ||
toList == null ||
toList.IsFixedSize || toList.IsReadOnly)
{
// create a new member list when null or readonly
toList = (IList)
(Implements(toMember.Type, typeof(IList)) &&
!toMember.Type.IsArray
? Activator.CreateInstance(toMember.Type)
: Activator.CreateInstance(
typeof(Collection <>).MakeGenericType(new[] { toItemType }))
);
// set it to the member, knowing it is an IEnumerable<TTo>
toMember.SetValue((IEnumerable <TTo>)toList);
}
// get original 'to' items for matching, and clear from member list
var toListOriginal = toOriginal == null
? new List <TTo>()
: toOriginal.ToList();
toList.Clear();
// prepare to map each 'from' item
var fromItemType = typeof(TFrom);
var mapper = Get(fromItemType, toItemType);
var mapperMethod = mapper.GetType().GetMethod("Invoke");
foreach (var fromItem in from)
{
// find the 'to' item or create one
var toItem = default(TTo);
if (match != null)
{
toItem = toListOriginal
.SingleOrDefault(t => match(fromItem, t));
toListOriginal.Remove(toItem);
}
if (toItem == null)
{
toItem = context.Create <TTo>();
}
// map
mapperMethod.Invoke(mapper,
new object[] { fromItem, toItem, context });
toList.Add(toItem);
context.Update(toItem);
}
if (!toListOriginal.Any())
{
return;
}
foreach (var toItem in toListOriginal)
{
context.Delete(toItem);
}
}