/// <summary>
/// Deals with any inner facades, continuing search inside them
/// </summary>
/// <param name="node">Constant expression</param>
/// <returns>The same expression, having scanned for member accesses</returns>
protected override Expression VisitConstant(ConstantExpression node)
{
if (node.Type.IsGenericType && node.Type.GetGenericTypeDefinition() == typeof(FacadeTypeQueryable <>))
{
var provider = ((IQueryable)node.Value).Provider as FacadeTypeQueryProvider;
if (provider != null)
{
var inner = new FieldAccessExtractor();
foreach (var field in inner.ExtractFields(provider.Source.InnerIQueryable))
{
this.AccessedFields.Add(field);
}
}
}
// Fix up the Expression tree to work with the underlying LINQ provider
//if ()
//{
// var provider = ((IQueryable)node.Value).Provider as FacadeTypeQueryProvider;
// if (provider != null)
// {
// try
// {
// return provider.Source.InnerIQueryable.Expression;
// }
// catch (Exception ex)
// {
// throw ex;
// }
// }
// return Source.InnerIQueryable.Expression;
//}
return(base.VisitConstant(node));
}
public static HashSet <string> ExtractFields(this IQueryable iq)
{
var fae = new FieldAccessExtractor();
return(fae.ExtractFields(iq));
}