public static Expression MapItemExpr(IConfigurationProvider configurationProvider, ProfileMap profileMap, Type sourceType, Type destType, Expression contextParam, out ParameterExpression itemParam)
{
var sourceElementType = ElementTypeHelper.GetElementType(sourceType);
var destElementType = ElementTypeHelper.GetElementType(destType);
itemParam = Expression.Parameter(sourceElementType, "item");
var typePair = new TypePair(sourceElementType, destElementType);
var itemExpr = ExpressionBuilder.MapExpression(configurationProvider, profileMap, typePair, itemParam, contextParam);
return(ExpressionFactory.ToType(itemExpr, destElementType));
}
public static Expression MapCollectionExpression(IConfigurationProvider configurationProvider,
ProfileMap profileMap, IMemberMap memberMap, Expression sourceExpression, Expression destExpression,
Expression contextExpression, Type ifInterfaceType, MapItem mapItem)
{
var passedDestination = Expression.Variable(destExpression.Type, "passedDestination");
var newExpression = Expression.Variable(passedDestination.Type, "collectionDestination");
var sourceElementType = ElementTypeHelper.GetElementType(sourceExpression.Type);
var itemExpr = mapItem(configurationProvider, profileMap, sourceExpression.Type, passedDestination.Type,
contextExpression, out ParameterExpression itemParam);
var destinationElementType = itemExpr.Type;
var destinationCollectionType = typeof(ICollection <>).MakeGenericType(destinationElementType);
if (!destinationCollectionType.IsAssignableFrom(destExpression.Type))
{
destinationCollectionType = typeof(IList);
}
var addMethod = destinationCollectionType.GetDeclaredMethod("Add");
Expression destination, assignNewExpression;
UseDestinationValue();
var addItems = ExpressionFactory.ForEach(sourceExpression, itemParam, Expression.Call(destination, addMethod, itemExpr));
var mapExpr = Expression.Block(addItems, destination);
var clearMethod = destinationCollectionType.GetDeclaredMethod("Clear");
var checkNull =
Expression.Block(new[] { newExpression, passedDestination },
Expression.Assign(passedDestination, destExpression),
assignNewExpression,
Expression.Call(destination, clearMethod),
mapExpr
);
if (memberMap != null)
{
return(checkNull);
}
var elementTypeMap = configurationProvider.ResolveTypeMap(sourceElementType, destinationElementType);
if (elementTypeMap == null)
{
return(checkNull);
}
var checkContext = ExpressionBuilder.CheckContext(elementTypeMap, contextExpression);
if (checkContext == null)
{
return(checkNull);
}
return(Expression.Block(checkContext, checkNull));
void UseDestinationValue()
{
if (memberMap?.UseDestinationValue == true)
{
destination = passedDestination;
assignNewExpression = Expression.Empty();
}
else
{
destination = newExpression;
Expression createInstance = passedDestination.Type.NewExpr(ifInterfaceType);
var isReadOnly = Expression.Property(ExpressionFactory.ToType(passedDestination, destinationCollectionType), "IsReadOnly");
assignNewExpression = Expression.Assign(newExpression,
Expression.Condition(Expression.OrElse(Expression.Equal(passedDestination, Expression.Constant(null)), isReadOnly), ExpressionFactory.ToType(createInstance, passedDestination.Type), passedDestination));
}
}
}
