public static IEnumerable <PropertyDescription> Retrieve(Expression expression, Expression target)
{
var visitor = new GetMemberAccessesVisitor(target);
visitor.Visit(expression);
return(visitor.Members.Select(member => new PropertyDescription(member.Name, member.GetMemberType())));
}
public override QueryExpressions GetSubQueryExpression(ExpressionBuilder builder, Expression projection, TypeMap typeMap, ExpressionRequest request, Expression instanceParameter, TypePairCount typePairCount)
{
var letMapInfos = _savedPaths.Select(path =>
new {
path.LetExpression,
MapFromSource = path.GetSourceExpression(instanceParameter),
Property = path.GetPropertyDescription(),
path.Marker
}).ToArray();
var properties = letMapInfos.Select(m => m.Property).Concat(GetMemberAccessesVisitor.Retrieve(projection, instanceParameter));
var letType = ProxyGenerator.GetSimilarType(typeof(object), properties);
TypeMap letTypeMap;
lock (ConfigurationProvider)
{
letTypeMap = TypeMapFactory.CreateTypeMap(request.SourceType, letType, typeMap.Profile);
}
var secondParameter = Parameter(letType, "dtoLet");
ReplaceSubQueries();
var firstExpression = builder.CreateMapExpressionCore(request, instanceParameter, typePairCount, letTypeMap, base.New());
return(new QueryExpressions(firstExpression, projection, secondParameter));
void ReplaceSubQueries()
{
foreach (var letMapInfo in letMapInfos)
{
var letProperty = letType.GetProperty(letMapInfo.Property.Name);
var letPropertyMap = letTypeMap.FindOrCreatePropertyMapFor(letProperty);
letPropertyMap.CustomMapExpression = Lambda(letMapInfo.LetExpression.ReplaceParameters(letMapInfo.MapFromSource), secondParameter);
projection = projection.Replace(letMapInfo.Marker, MakeMemberAccess(secondParameter, letProperty));
}
projection = new ReplaceMemberAccessesVisitor(instanceParameter, secondParameter).Visit(projection);
}
}
