System.Data.Entity.Core.SchemaObjectModel.SchemaEntityType.ResolveTopLevelNames C# (CSharp) Method

        internal override void ResolveTopLevelNames()
        {
            base.ResolveTopLevelNames();

            if (BaseType != null)
            {
                if (!(BaseType is SchemaEntityType))
                {
                    AddError(
                        ErrorCode.InvalidBaseType, EdmSchemaErrorSeverity.Error,
                        Strings.InvalidBaseTypeForItemType(BaseType.FQName, FQName));
                }
                // Since the base type is not null, key must be defined on the base type
                else if (_keyElement != null
                         && BaseType != null)
                {
                    AddError(
                        ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error,
                        Strings.InvalidKeyKeyDefinedInBaseClass(FQName, BaseType.FQName));
                }
            }
            // If the base type is not null, then the key must be defined on the base entity type, since
            // we don't allow entity type without keys. 
            else if (_keyElement == null)
            {
                AddError(
                    ErrorCode.KeyMissingOnEntityType, EdmSchemaErrorSeverity.Error,
                    Strings.KeyMissingOnEntityType(FQName));
            }
            else if (null == BaseType
                     && null != UnresolvedBaseType)
            {
                // this is already an error situation, we won't do any resolve name further in this type
                return;
            }
            else
            {
                _keyElement.ResolveTopLevelNames();
            }
        }