protected virtual Expression VisitExtendedMemberInit(ExtendedMemberInitExpression node)
{
var newExpression = VisitAndConvert(node.NewExpression, nameof(VisitExtendedMemberInit));
var arguments = Visit(node.Arguments).ToArray();
var entityType = model.FindEntityType(node.Type);
if (entityType != null)
{
var collectionMembers
= from n in entityType.GetNavigations()
where n.IsCollection()
from m in new[] { n.GetReadableMemberInfo(), n.GetWritableMemberInfo() }
select m;
for (var i = 0; i < arguments.Length; i++)
{
if (collectionMembers.Contains(node.WritableMembers[i]))
{
var sequenceType = node.WritableMembers[i].GetMemberType().GetSequenceType();
arguments[i]
= Expression.Coalesce(
arguments[i].AsCollectionType(),
Expression.New(typeof(List <>).MakeGenericType(sequenceType)));
}
}
}
return(node.Update(newExpression, arguments));
}
protected virtual Expression VisitExtendedMemberInit(ExtendedMemberInitExpression node)
{
var newExpression = VisitAndConvert(node.NewExpression, nameof(VisitExtendedMemberInit));
if (Finished)
{
return(node.Update(newExpression, node.Arguments));
}
var arguments = node.Arguments.ToList();
var readableMembers = node.ReadableMembers.ToList();
var writableMembers = node.WritableMembers.ToList();
var currentMember = path.Pop();
var currentMemberInfo = currentMember.GetReadableMemberInfo();
var foundMember = false;
for (var i = 0; i < arguments.Count; i++)
{
var argument = arguments[i];
if (node.ReadableMembers[i] == currentMemberInfo)
{
foundMember = true;
if (path.Count == 0)
{
arguments[i] = includedExpression;
Finished = true;
}
else
{
arguments[i] = Visit(argument);
}
break;
}
}
path.Push(currentMember);
if (!foundMember && currentMemberInfo.DeclaringType.IsAssignableFrom(node.Type))
{
Finished = true;
var writableMemberInfo = currentMember.GetWritableMemberInfo();
arguments.Add(
writableMemberInfo.GetMemberType().IsCollectionType()
? includedExpression.AsCollectionType()
: includedExpression);
readableMembers.Add(currentMember.GetReadableMemberInfo());
writableMembers.Add(writableMemberInfo);
return(new ExtendedMemberInitExpression(
node.Type,
node.NewExpression,
arguments,
readableMembers,
writableMembers));
}
else
{
return(node.Update(newExpression, arguments));
}
}