System.Net.EndPointListener.SearchListener C# (CSharp) Method

		HttpListener SearchListener (string host, Uri uri, out ListenerPrefix prefix)
		{
			prefix = null;
			if (uri == null)
				return null;

			//TODO: We should use a ReaderWriterLock between this and the add/remove operations.
			if (host != null) {
				int colon = host.IndexOf (':');
				if (colon >= 0)
					host = host.Substring (0, colon);
			}

			string path = HttpUtility.UrlDecode (uri.AbsolutePath);
			string path_slash = path [path.Length - 1] == '/' ? path : path + "/";
			
			HttpListener best_match = null;
			int best_length = -1;

			try {
				plock.AcquireReaderLock (-1);
				if (host != null && host != "") {
					foreach (ListenerPrefix p in prefixes.Keys) {
						string ppath = p.Path;
						if (ppath.Length < best_length)
							continue;

						if (p.Host == host && (path.StartsWith (ppath) || path_slash.StartsWith (ppath))) {
							best_length = ppath.Length;
							best_match = (HttpListener) prefixes [p];
							prefix = p;
						}
					}
					if (best_length != -1)
						return best_match;
				}

				best_match = MatchFromList (host, path, unhandled, out prefix);
				if (best_match != null)
					return best_match;

				best_match = MatchFromList (host, path, all, out prefix);
				if (best_match != null)
					return best_match;
			} finally {
				try {
					plock.ReleaseReaderLock ();
				} catch {}
			}
			return null;
		}