C# IProperty.IsPrimaryKey方法代码示例

        public PropertyMetadata(IProperty property, Type dbContextType)
        {
            Contract.Assert(property != null);
            Contract.Assert(property.ClrType != null); //Do we need to make sure this is not called on Shadow properties?

            PropertyName = property.Name;
            TypeName = property.ClrType.FullName;

            IsPrimaryKey = property.IsPrimaryKey();
            // The old scaffolding has some logic for this property in an edge case which is
            // not clear if needed any more; see EntityFrameworkColumnProvider.DetermineIsForeignKeyComponent
            IsForeignKey = property.IsForeignKey();

            IsEnum = property.ClrType.GetTypeInfo().IsEnum;
            IsReadOnly = property.IsReadOnlyBeforeSave;
            IsAutoGenerated = property.IsStoreGeneratedAlways;

            ShortTypeName = TypeUtil.GetShortTypeName(property.ClrType);

            Scaffold = true;
            var reflectionProperty = property.DeclaringEntityType.ClrType.GetProperty(property.Name);
            if (reflectionProperty != null)
            {
                var scaffoldAttr = reflectionProperty.GetCustomAttribute(typeof(ScaffoldColumnAttribute)) as ScaffoldColumnAttribute;
                if (scaffoldAttr != null)
                {
                    Scaffold = scaffoldAttr.Scaffold;
                }
            }

            IsEnumFlags = false;
            if (IsEnum)
            {
                var flagsAttr = property.ClrType.GetTypeInfo().GetCustomAttribute(typeof(FlagsAttribute)) as FlagsAttribute;
                IsEnumFlags = (flagsAttr != null);
            }
        }

        private void DetectKeyChange(InternalEntityEntry entry, IProperty property, Sidecar snapshot)
        {
            if (!snapshot.HasValue(property))
            {
                return;
            }

            // TODO: Perf: make it fast to check if a property is part of any key
            var isPrimaryKey = property.IsPrimaryKey();
            var isPrincipalKey = _model.GetReferencingForeignKeys(property).Any();
            var isForeignKey = property.IsForeignKey();

            if (isPrimaryKey
                || isPrincipalKey
                || isForeignKey)
            {
                var snapshotValue = snapshot[property];
                var currentValue = entry[property];

                // Note that mutation of a byte[] key is not supported or detected, but two different instances
                // of byte[] with the same content must be detected as equal.
                if (!StructuralComparisons.StructuralEqualityComparer.Equals(currentValue, snapshotValue))
                {
                    if (isForeignKey)
                    {
                        entry.StateManager.Notify.ForeignKeyPropertyChanged(entry, property, snapshotValue, currentValue);
                    }

                    if (isPrimaryKey)
                    {
                        entry.StateManager.UpdateIdentityMap(entry, snapshot.GetPrimaryKeyValue());
                    }

                    if (isPrincipalKey)
                    {
                        entry.StateManager.Notify.PrincipalKeyPropertyChanged(entry, property, snapshotValue, currentValue);
                    }

                    snapshot.TakeSnapshot(property);
                }
            }
        }

        private bool DetectPrincipalKeyChange(StateEntry entry, IProperty property)
        {
            // TODO: Perf: make it fast to check if a property is part of the primary key
            var isPrimaryKey = property.IsPrimaryKey();

            // TODO: Perf: make it faster to check if the property is at the principal end or not
            var foreignKeys = _configuration.Model.GetReferencingForeignKeys(property).ToArray();

            if (isPrimaryKey || foreignKeys.Length > 0)
            {
                var snapshotValue = entry.RelationshipsSnapshot[property];
                var currentValue = entry[property];

                if (!StructuralComparisons.StructuralEqualityComparer.Equals(currentValue, snapshotValue))
                {
                    if (isPrimaryKey)
                    {
                        _configuration.StateManager.UpdateIdentityMap(entry, entry.RelationshipsSnapshot.GetPrimaryKeyValue());
                    }

                    _notifier.PrincipalKeyPropertyChanged(entry, property, snapshotValue, currentValue);

                    entry.RelationshipsSnapshot.TakeSnapshot(property);

                    return true;
                }
            }

            return false;
        }