Lucene.Net.Index.IndexReader.NumDocs C# (CSharp) Method

        public abstract int NumDocs();

		/// <summary>Add an IndexReader whose stored fields will not be returned.  This can
		/// accellerate search when stored fields are only needed from a subset of
		/// the IndexReaders.
		/// 
		/// </summary>
		/// <throws>  IllegalArgumentException if not all indexes contain the same number  </throws>
		/// <summary>     of documents
		/// </summary>
		/// <throws>  IllegalArgumentException if not all indexes have the same value  </throws>
		/// <summary>     of {@link IndexReader#MaxDoc()}
		/// </summary>
		public virtual void  Add(IndexReader reader, bool ignoreStoredFields)
		{
			
			if (readers.Count == 0)
			{
				this.maxDoc = reader.MaxDoc();
				this.numDocs = reader.NumDocs();
				this.hasDeletions = reader.HasDeletions();
			}
			
			if (reader.MaxDoc() != maxDoc)
			// check compatibility
				throw new System.ArgumentException("All readers must have same maxDoc: " + maxDoc + "!=" + reader.MaxDoc());
			if (reader.NumDocs() != numDocs)
				throw new System.ArgumentException("All readers must have same numDocs: " + numDocs + "!=" + reader.NumDocs());
			
			System.Collections.IEnumerator i = reader.GetFieldNames(IndexReader.FieldOption.ALL).GetEnumerator();
			while (i.MoveNext())
			{
                System.Collections.DictionaryEntry fi = (System.Collections.DictionaryEntry) i.Current;

				// update fieldToReader map
				System.String field = fi.Key.ToString();
				if (fieldToReader[field] == null)
					fieldToReader[field] = reader;
			}
			
			if (!ignoreStoredFields)
				storedFieldReaders.Add(reader); // add to storedFieldReaders
			readers.Add(reader);
		}