private static Expression GetEnumerableSizeAccessor(EnumerableMappingFacts facts, Expression accessSourceCollection)
{
Expression accessSourceCollectionSize;
// If it's an array, we want to access .Length to know its size, if it's ICollection<T>, we want .Count
// and for anything else we have to use .Count().
if (facts.SourceIsArray)
{
// source.Length
accessSourceCollectionSize = Expression.Property(accessSourceCollection, "Length");
}
else
{
if (facts.SourceIsCollection)
{
var genericCollection = typeof(ICollection<>).MakeGenericType(facts.SourceElementType);
var countProperty = genericCollection.GetProperty("Count");
// source.Count
accessSourceCollectionSize = Expression.Property(accessSourceCollection, countProperty);
}
else
{
var genericEnumerable = typeof(IEnumerable<>).MakeGenericType(facts.SourceElementType);
// source.Count()
accessSourceCollectionSize = Expression.Call(null, countMethod.MakeGenericMethod(facts.SourceElementType), accessSourceCollection);
}
}
return accessSourceCollectionSize;
}
private EnumerableMappingFacts FindEnumerableMappingFacts(
ParameterExpression source,
ParameterExpression destination,
ProposedTypeMapping complexTypeMapping)
{
var facts = new EnumerableMappingFacts();
if (complexTypeMapping.SourceMember != null)
{
facts.SourceEnumerableType = complexTypeMapping.SourceMember.PropertyOrFieldType;
}
else
{
facts.SourceEnumerableType = source.Type;
}
if (complexTypeMapping.DestinationMember != null)
{
facts.DestinationEnumerableType = complexTypeMapping.DestinationMember.PropertyOrFieldType;
}
else
{
facts.DestinationEnumerableType = destination.Type;
}
facts.DestinationElementType = CollectionTypeHelper.GetTypeInsideEnumerable(facts.DestinationEnumerableType);
facts.SourceElementType = CollectionTypeHelper.GetTypeInsideEnumerable(facts.SourceEnumerableType);
facts.CanAssignSourceElementsToDestination = CanAssignSourceElementToDestination(complexTypeMapping, facts.DestinationElementType, facts.SourceElementType);
// If we're working with a Dictionary as the source
if (facts.SourceElementType.IsGenericType
&& typeof(KeyValuePair<,>).IsAssignableFrom(facts.SourceElementType.GetGenericTypeDefinition()))
{
facts.SourceIsDictionaryType = true;
}
// If we're working with a Dictionary as the destination
if (facts.DestinationElementType.IsGenericType
&& typeof(KeyValuePair<,>).IsAssignableFrom(facts.DestinationElementType.GetGenericTypeDefinition()))
{
facts.DestinationIsDictionaryType = true;
}
facts.SourceIsArray = facts.SourceEnumerableType.IsArray;
var genericCollection = typeof(ICollection<>).MakeGenericType(facts.SourceElementType);
if (genericCollection.IsAssignableFrom(facts.SourceEnumerableType))
{
facts.SourceIsCollection = true;
}
else
{
facts.SourceIsIEnumerable = true;
}
facts.DestinationIsArray = facts.DestinationEnumerableType.IsArray;
if (options.Conventions.PreserveDestinationListContents
&& IsCollectionType(facts.DestinationEnumerableType)
&& !facts.DestinationIsArray)
{
facts.PreserveDestinationContents = true;
}
if (IsListType(facts.SourceEnumerableType))
{
facts.SourceIsList = true;
}
if (facts.DestinationEnumerableType.IsAssignableFrom(facts.SourceEnumerableType))
{
facts.CanAssignSourceToDestination = true;
}
if (facts.DestinationEnumerableType.IsInterface)
{
facts.DestinationCouldBeArray = !facts.DestinationIsDictionaryType;
}
else if (facts.DestinationIsArray)
{
facts.DestinationCouldBeArray = true;
}
return facts;
}