Ok. Here is the case:

===========code===================
 public static void TestGetFieldables()
       {
           byte[] bin = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
Directory dir = new Lucene.Net.Store.RAMDirectory(); IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
           Document doc = new Document();
           doc.Add(new Field("bin1", bin, Field.Store.YES));
           doc.Add(new Field("bin2", bin, Field.Store.COMPRESS));
doc.Add(new Field("junk", "junk text", Field.Store.NO, Field.Index.ANALYZED));

           writer.AddDocument(doc);
           writer.Close();

           IndexReader reader = IndexReader.Open(dir);
System.Collections.Hashtable lazyFields = new System.Collections.Hashtable();
           lazyFields["bin1"] = "bin1";
FieldSelector sel = new SetBasedFieldSelector(new System.Collections.Hashtable(), lazyFields);
           doc = reader.Document(reader.MaxDoc() - 1, sel);
Lucene.Net.Documents.Fieldable[] fieldables = doc.GetFieldables("bin1") as Lucene.Net.Documents.Fieldable[]; // <- Exception is here
           System.Diagnostics.Debug.Assert(fieldables!=null);
           System.Diagnostics.Debug.Assert(1== fieldables.Length);
           reader.Close();
}
===========/code===================

System.InvalidCastException was unhandled
Message="At least one element in the source array could not be cast down to the destination array type."
 Source="mscorlib"
==============================

Digy (JIRA) пишет:
[ https://issues.apache.org/jira/browse/LUCENENET-194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755601#action_12755601 ]
Digy commented on LUCENENET-194:
--------------------------------

Hi Iliev,

Everything works fine. I get no exceptions.

Can you post a test case showing the bug?

DIGY

Bug in Lucene.Net.Document.Document.cs GetFieldables method
-----------------------------------------------------------

                Key: LUCENENET-194
                URL: https://issues.apache.org/jira/browse/LUCENENET-194
            Project: Lucene.Net
         Issue Type: Bug
           Reporter: Iliev Andrei
  Original Estimate: 0h
 Remaining Estimate: 0h

                public Fieldable[] GetFieldables(System.String name)
                {
                        /*****skip***/
return (Fieldable[]) result.ToArray(typeof(Field)); } SHOULD BE return (Fieldable[]) result.ToArray(typeof(Fieldable)), otherwise exception will arise.


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