System.IO.StringReader.Dispose C# (CSharp) Method

        protected override void Dispose(bool disposing)
        {
            _s = null;
            _pos = 0;
            _length = 0;
            base.Dispose(disposing);
        }

		private Token(string tokenXml, Uri audience, TokenDecryptor decryptor) {
			Requires.NotNullOrEmpty(tokenXml, "tokenXml");
			Requires.True(decryptor != null || !IsEncrypted(tokenXml), null);
			Contract.Ensures(this.AuthorizationContext != null);

			byte[] decryptedBytes;
			string decryptedString;

			using (StringReader xmlReader = new StringReader(tokenXml)) {
				var readerSettings = MessagingUtilities.CreateUntrustedXmlReaderSettings();
				using (XmlReader tokenReader = XmlReader.Create(xmlReader, readerSettings)) {
					Contract.Assume(tokenReader != null); // BCL contract should say XmlReader.Create result != null
					if (IsEncrypted(tokenReader)) {
						Logger.InfoCard.DebugFormat("Incoming SAML token, before decryption: {0}", tokenXml);
						decryptedBytes = decryptor.DecryptToken(tokenReader);
						decryptedString = Encoding.UTF8.GetString(decryptedBytes);
						Contract.Assume(decryptedString != null); // BCL contracts should be enhanced here
					} else {
						decryptedBytes = Encoding.UTF8.GetBytes(tokenXml);
						decryptedString = tokenXml;
					}
				}
			}

			var stringReader = new StringReader(decryptedString);
			try {
				this.Xml = new XPathDocument(stringReader).CreateNavigator();
			} catch {
				stringReader.Dispose();
				throw;
			}

			Logger.InfoCard.DebugFormat("Incoming SAML token, after any decryption: {0}", this.Xml.InnerXml);
			this.AuthorizationContext = TokenUtility.AuthenticateToken(this.Xml.ReadSubtree(), audience);
		}