System.Runtime.Serialization.DataContractSet.InternalAdd C# (CSharp) Method

        internal void InternalAdd(XmlQualifiedName name, DataContract dataContract)
        {
            DataContract dataContractInSet = null;
            if (Contracts.TryGetValue(name, out dataContractInSet))
            {
                if (!dataContractInSet.Equals(dataContract))
                {
                    if (dataContract.UnderlyingType == null || dataContractInSet.UnderlyingType == null)
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.DupContractInDataContractSet, dataContract.StableName.Name, dataContract.StableName.Namespace)));
                    else
                    {
                        bool typeNamesEqual = (DataContract.GetClrTypeFullName(dataContract.UnderlyingType) == DataContract.GetClrTypeFullName(dataContractInSet.UnderlyingType));
                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.DupTypeContractInDataContractSet, (typeNamesEqual ? dataContract.UnderlyingType.AssemblyQualifiedName : DataContract.GetClrTypeFullName(dataContract.UnderlyingType)), (typeNamesEqual ? dataContractInSet.UnderlyingType.AssemblyQualifiedName : DataContract.GetClrTypeFullName(dataContractInSet.UnderlyingType)), dataContract.StableName.Name, dataContract.StableName.Namespace)));
                    }
                }
            }
            else
            {
                Contracts.Add(name, dataContract);

                if (dataContract is ClassDataContract)
                {
                    AddClassDataContract((ClassDataContract)dataContract);
                }
                else if (dataContract is CollectionDataContract)
                {
                    AddCollectionDataContract((CollectionDataContract)dataContract);
                }
                else if (dataContract is XmlDataContract)
                {
                    AddXmlDataContract((XmlDataContract)dataContract);
                }
            }
        }