Upgrade from Lucene.NET 3 to Lucene.NET 4.0

clauses

-Assert.AreEqual(2, ((BooleanQuery)query.Clauses[0].Query).Clauses.Count);
+Assert.AreEqual(2, ((BooleanQuery)query.Clauses[0].Query).Clauses.Length);

fieldable

-		private List<Func<T, IFieldable>> dataCtors = new List<Func<T, IFieldable>>();
+		private List<Func<T, IIndexableField>> dataCtors = new List<Func<T, IIndexableField>>();

numericfield

-		public static NumericField SetDate(this NumericField field, DateTime date)
+		public static IntField SetDate(this IntField field, DateTime date)
 		{
-			return field.SetIntValue(date.AsID());
+			field.SetIntValue(date.AsID());
+			return field;
 		}

offsetgap

-			/// <summary> Return the offsetGap from the analyzer assigned to field </summary>
-			public override int GetOffsetGap(IFieldable field)
+			public override int GetOffsetGap(string fieldName)
 			{
-				var analyzer = map.GetAnalyzer(field.Name);
+				var analyzer = map.GetAnalyzer(fieldName);
 				if (analyzer == null)
 					analyzer = defaultAnalyzer;
-				return analyzer.GetOffsetGap(field);
+				return analyzer.GetOffsetGap(fieldName);
 			}

StandardNoStopWordsAnalyser.cs

public class StandardNoStopWordsAnalyser : StandardAnalyzer
{
  public StandardNoStopWordsAnalyser() : base(Version.LUCENE_29, new HashSet<string>()) { } 
}

StandardNoStopWordsAnalyzer replacement

// Equivalent of StandardNoStopWordsAnalyser
new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_43, new CharArraySet(Lucene.Net.Util.Version.LUCENE_43, 0, ignoreCase: false));

termattribute1

-this.termAtt = AddAttribute<TermAttribute>();
+this.termAtt = AddAttribute<CharTermAttribute>();

termattribute2

-termAtt.SetTermBuffer(termAtt.Term.Trim());
+termAtt.Clear();
+termAtt.Append(termAtt.ToString().Trim());

usings

using Lucene.Net.Analysis.Standard;
using Lucene.Net.Analysis.Util;

version

-var luceneParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "text", new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29));
+var luceneParser = new QueryParser(Lucene.Net.Util.Version.LUCENE_43, "text", new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_43));