private Expression VisitParameterInteral(ParameterExpression p, bool ignoreParamStack)
{
DbReference dbRef = null;
if (p.Type.IsAnonymouse() || p.Type.IsGrouping())
{
var dbSelect = _state.GetLastSelect();
dbRef = _dbFactory.BuildRef(null);
dbRef.OwnerSelect = dbSelect;
var collection = p.Type.IsGrouping()
? dbSelect.GroupBys.AsEnumerable()
: dbSelect.Selection;
foreach (var selectable in collection)
{
dbRef.RefSelection[selectable.GetAliasOrName()] = selectable;
}
}
if (dbRef == null && !ignoreParamStack && _state.ParamterStack.Count > 0)
{
var dbRefs = _state.ParamterStack.Peek();
if (dbRefs.ContainsKey(p))
{
dbRef = dbRefs[p];
}
}
// if we can not find the parameter expression in the ParamterStack,
// it means this is the first time we translates the parameter, so we
// need to look for it in the most recently translated select
// this is required because we may not always has select on the top
// of the stack, especially we translating arguments for method calls
if (dbRef == null)
{
var dbSelect = _state.GetLastSelect();
var refCol = (_state.ResultStack.Peek() as IDbRefColumn) ??
dbSelect.Selection.OfType <IDbRefColumn>().LastOrDefault();
dbRef = refCol != null ? refCol.Ref : dbSelect.From;
}
if (dbRef == null)
{
throw new NullReferenceException();
}
_state.ResultStack.Push(dbRef);
return(p);
}
internal IDbSelect GetSelect()
{
return(_state.GetLastSelect());
}
