System.Xml.XmlBinaryReaderSession.TryLookup C# (CSharp) Method

        public bool TryLookup(XmlDictionaryString value, out XmlDictionaryString result)
        {
            if (value == null)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(nameof(value)));
            if (value.Dictionary != this)
            {
                result = null;
                return false;
            }
            result = value;
            return true;
        }

        public string GetValue(IXmlDictionary staticDictionary, XmlBinaryReaderSession readerSession)
        {
            int id = this.DictionaryId / 2;
            XmlDictionaryString dicString = XmlDictionaryString.Empty;
            bool found;
            if (this.IsSession)
            {
                if (readerSession == null)
                {
                    return null;
                }

                found = readerSession.TryLookup(id, out dicString);
            }
            else
            {
                if (staticDictionary == null)
                {
                    return null;
                }

                found = staticDictionary.TryLookup(id, out dicString);
            }

            if (found)
            {
                return dicString.Value;
            }
            else
            {
                throw new ArgumentException("Cannot find value for dictionary string with ID = " + this.DictionaryId);
            }
        }