Mono.TextEditor.TextViewMargin.SearchPatternWorkerDoWork C# (CSharp) Method

		void SearchPatternWorkerDoWork (object sender, System.ComponentModel.DoWorkEventArgs e)
		{
			SearchWorkerArguments args = (SearchWorkerArguments)e.Argument;
			System.ComponentModel.BackgroundWorker worker = (System.ComponentModel.BackgroundWorker)sender;
			List<TextSegment> newRegions = new List<TextSegment> ();
			int offset = args.Engine.SearchRequest.SearchRegion.IsInvalid ? 0 : args.Engine.SearchRequest.SearchRegion.Offset;
			do {
				if (worker.CancellationPending)
					return;
				SearchResult result = null;
				try {
					result = args.Engine.SearchForward (worker, args, offset);
				} catch (Exception ex) {
					Console.WriteLine ("Got exception while search forward:" + ex);
					break;
				}
				if (worker.CancellationPending)
					return;
				if (result == null || result.SearchWrapped)
					break;
				offset = result.EndOffset;
				newRegions.Add (result.Segment);
			} while (true);
			HashSet<int> updateLines = null;
			if (args.OldRegions.Count == newRegions.Count) {
				updateLines = new HashSet<int> ();
				for (int i = 0; i < newRegions.Count; i++) {
					if (worker.CancellationPending)
						return;
					if (args.OldRegions [i].Offset != newRegions [i].Offset || args.OldRegions [i].Length != newRegions [i].Length) {
						int lineNumber = Document.OffsetToLineNumber (args.OldRegions [i].Offset);
						if (lineNumber > args.LastLine)
							break;
						if (lineNumber >= args.FirstLine)
							updateLines.Add (lineNumber);
					}
				}
			}
			Application.Invoke (delegate {
				this.selectedRegions = newRegions;
				if (updateLines != null) {
					var document = textEditor.Document;
					if (document == null)
						return;
					foreach (int lineNumber in updateLines) {
//						RemoveCachedLine (Document.GetLine (lineNumber));
						document.RequestUpdate (new LineUpdate (lineNumber));
					}
					document.CommitDocumentUpdate ();
				} else {
					UpdateRegions (args.OldRegions.Concat (newRegions), args);
				}
				OnSearchRegionsUpdated (EventArgs.Empty);
			});
		}