System.Runtime.Serialization.DataContractSet.this C# (CSharp) Метод

        public DataContract this[XmlQualifiedName key]
        {
            get
            {
                DataContract dataContract = DataContract.GetBuiltInDataContract(key.Name, key.Namespace);
                if (dataContract == null)
                {
                    Contracts.TryGetValue(key, out dataContract);
                }
                return dataContract;
            }
        }