Eager loading Lucene.Net docs

gistfile1.cs

// Only load the fields that the query asks for.

// The Lucene.Net signature for this is wonky, as
// Java Lucene takes a Set<String>. As a result,
// we are obliged to create this hashtable where
// the keys == values.
var loadFields = new Hashtable();
foreach (var fieldName in request.ResultFields)
{
    loadFields.Add(fieldName, fieldName);
}

// No lazy loading, since we already know exactly
// which fields we need to work with.
var selector = new SetBasedFieldSelector(loadFields, new Hashtable());
var luceneDoc = reader.Document(aDoc, selector);