internal static void UpdateFromReference(IProperty property, IEntity entity, PropertyValue value)
{
var relationPro = property.As <RelationProperty>();
if (relationPro == null || value.IsNullOrEmpty() ||
relationPro.RelationPropertyType != RelationPropertyType.Entity)
{
return;
}
var refEntity = value.GetStorageValue().As <IEntity>();
var relationKey = RelationshipUnity.GetRelationship(relationPro);
if (relationKey == null)
{
return;
}
IEntity descEntity;
IEntity sourceEntity;
if (relationKey.Style == RelationshipStyle.One2Many)
{
descEntity = entity;
sourceEntity = refEntity;
}
else
{
descEntity = refEntity;
sourceEntity = entity;
}
foreach (var key in relationKey.Keys)
{
descEntity.InternalSetValue(key.OtherProperty, sourceEntity.InternalGetValue(key.ThisProperty));
}
}
/// <summary>
/// 清空并标识，将删除实体集中的所有对象。
/// </summary>
/// <param name="value"></param>
internal static void SetEntitySetToNull(PropertyValue value)
{
if (value.IsNullOrEmpty())
{
return;
}
value.GetStorageValue().As <IEntitySetInternalExtension>(e => e.IsNeedClear = true);
}
/// <summary>
/// 改为移除状态，确定该该实体删除。
/// </summary>
/// <param name="value"></param>
internal static void SetEntityToNull(PropertyValue value)
{
if (value.IsNullOrEmpty())
{
return;
}
value.GetStorageValue().As <IEntity>(entity => entity.SetState(EntityState.Detached));
}
/// <summary>
/// 获取指定属性的值。
/// </summary>
/// <param name="instance">要读取的实体实例。</param>
/// <param name="propertyName">要读取的属性的名称。</param>
/// <returns>指定属性的值。</returns>
public override object ReadValue(TEntity instance, string propertyName)
{
var property = PropertyUnity.GetProperty(typeof(TEntity), propertyName, true);
if (property != null && property is ILoadedProperty)
{
var value = instance.InternalGetValue(property);
return(PropertyValue.IsNullOrEmpty(value) ? null : value.GetStorageValue());
}
return(null);
}
/// <summary>
/// 检查 EntitySet 里的元素是还被销毁。
/// </summary>
/// <param name="property"></param>
/// <param name="oldValue"></param>
/// <param name="newValue"></param>
/// <returns></returns>
private bool CheckEntitySetDestroy(IProperty property, PropertyValue oldValue, PropertyValue newValue)
{
if (!property.Is <EntitySetProperty>())
{
return(false);
}
if (oldValue == null || oldValue.IsNullOrEmpty())
{
oldValue = ProcessSupposedProperty(property);
}
if (oldValue != null && !oldValue.IsNullOrEmpty() && !newValue.IsNullOrEmpty())
{
var oldSet = oldValue.GetStorageValue() as IEntitySetInternalExtension;
oldSet.As <IList>(s => s.Clear());
var newSet = newValue.GetStorageValue() as IEntitySetInternalExtension;
newSet.ShiftDetachedList(oldSet);
return(true);
}
return(false);
}
/// <summary>
/// 内部设置属性值的方法。
/// </summary>
/// <param name="property"></param>
/// <param name="value"></param>
private void InternalSetValue(IProperty property, PropertyValue value)
{
if ((value.IsNullOrEmpty()))
{
if (SetNullable(property))
{
return;
}
}
if (property is RelationProperty)
{
lazyMgr.SetValueCreated(property.Name);
}
valueEntry.Modify(property.Name, value);
}
/// <summary>
/// 将一个实体对象添加到 <see cref="DataTable"/> 对象里，该 <see cref="DataTable"/> 的结构必须保证与实体结构相符。
/// </summary>
/// <param name="entity">当前的实体对象。</param>
/// <param name="table">一个使用 <see cref="Construct"/> 构造的 <see cref="DataTable"/>。</param>
public static void Putin(this IEntity entity, DataTable table)
{
Guard.ArgumentNull(entity, "entity");
Guard.ArgumentNull(table, "table");
var properties = PropertyUnity.GetPersistentProperties(entity.EntityType)
.Where(s => table.Columns.Contains(s.Name)).ToList();
var count = properties.Count;
var data = new object[count];
for (var i = 0; i < count; i++)
{
var value = entity.InternalGetValue(properties[i]);
data[i] = PropertyValue.IsNullOrEmpty(value) ? DBNull.Value : value.GetStorageValue();
}
table.Rows.Add(data);
}
/// <summary>
/// 检查关联属性的空值，如果属性值已设置为null，则不应显示给客户端。
/// </summary>
/// <param name="property">要检查的属性。</param>
/// <param name="value">属性的值。</param>
/// <returns></returns>
internal static PropertyValue CheckReturnValue(IProperty property, PropertyValue value)
{
var relationPro = property.As <RelationProperty>();
if (relationPro == null || value.IsNullOrEmpty())
{
return(value);
}
switch (relationPro.RelationPropertyType)
{
case RelationPropertyType.Entity:
return(CheckReturnEntityValue(value.GetStorageValue().As <IEntity>(), value));
case RelationPropertyType.EntitySet:
return(CheckReturnEntitySetValue(value.GetStorageValue().As <IEntitySetInternalExtension>(), value));
default:
return(value);
}
}
/// <summary>
/// 读取实体实例的所有值。
/// </summary>
/// <param name="instance">要读取的实体实例。</param>
/// <returns>所有属性的值。</returns>
public override IEnumerable <object> ReadValues(TEntity instance)
{
return(PropertyUnity.GetLoadedProperties(typeof(TEntity), true)
.Select(p => instance.InternalGetValue(p))
.Select(value => PropertyValue.IsNullOrEmpty(value) ? null : value.GetStorageValue()));
}
