public QDescriptorConverter(MapperConfiguration conf, Expression query)
{
ContextExpression = new Stack <Expression>();
ContextParameters = new Stack <ParameterExpression>();
Mapper = new Mapping(conf);
MemberNodeConverter = new MemberNodeConverter(Mapper);
Query = query;
}
public void VisitProjection(QNode node)
{
var left = ContextExpression.Pop();
Type projectorType = null;
var dynamicProperties = new List <DynamicProperty>();
var bindings1 = MemberNodeConverter.ConvertToBindings(ContextParameters.Peek(), node);
foreach (var binding in bindings1)
{
var property = new DynamicProperty(binding.Key, binding.Value.Type);
dynamicProperties.Add(property);
}
projectorType = ClassFactory.Instance.GetDynamicClass(dynamicProperties);
var resultProperties = projectorType.GetProperties();
var bindingsSource = new List <Expression>();
var bindingsProperties = new List <PropertyInfo>();
foreach (var binding in bindings1)
{
bindingsProperties.Add(resultProperties.FirstOrDefault(x => x.Name == binding.Key));
bindingsSource.Add(binding.Value);
}
var bindings = new List <MemberBinding>();
for (var i = 0; i < bindingsSource.Count; i++)
{
var exp = Expression.Bind(bindingsProperties[i], bindingsSource[i]);
bindings.Add(exp);
}
var lambda =
Expression.Lambda(
Expression.MemberInit(Expression.New(projectorType.GetConstructor(Type.EmptyTypes)), bindings),
ContextParameters.Peek());
var result = BuildMethodCallExpression(MethodType.Select, left, lambda);
ContextExpression.Push(result);
HasProjection = true;
Mapper.EnableMapping = false;
}
public void VisitMember(QNode node)
{
var member = MemberNodeConverter.ConvertToMemberExpression(ContextParameters.Peek(), node);
ContextExpression.Push(member);
}