/// <summary>
/// Determines whether [is attached to] [the specified entity].
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="entity">The entity.</param>
/// <returns>
/// <c>true</c> if [is attached to] [the specified entity]; otherwise, <c>false</c>.
/// </returns>
/// <exception cref="System.ArgumentNullException">entity</exception>
public bool IsAttachedTo <T>(T entity) where T : class
{
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
ObjectStateEntry entry;
if (ObjectStateManager.TryGetObjectStateEntry(entity, out entry))
{
return(entry.State != EntityState.Detached);
}
return(false);
}
public void Attach(object entity)
{
bool attached = false;
ObjectStateManager stateManager = (this.context as IObjectContextAdapter).ObjectContext.ObjectStateManager;
ObjectStateEntry stateEntry = null;
if (stateManager.TryGetObjectStateEntry(entity, out stateEntry))
{
attached = stateEntry.State != System.Data.Entity.EntityState.Detached;
}
if (!attached)
{
this.context.Entry(entity).State = System.Data.Entity.EntityState.Modified;
}
}
public void Attach <TEntity>(TEntity entity)
where TEntity : EntityObject
{
if (entity.EntityState != EntityState.Detached)
{
return;
}
// Let's see if the same entity with same key values are already there
ObjectStateEntry entry;
if (ObjectStateManager.TryGetObjectStateEntry(entity, out entry))
{
}
else
{
_AttachMethodCache[typeof(TEntity).Name](this, entity);
}
}
/// <summary>
/// Gets the state of the entity.
/// </summary>
/// <param name="manager">The manager.</param>
/// <param name="entity">The entity.</param>
/// <remarks>
/// For more detail, see “RIA Services and Entity Framework POCOs”
/// [http://thedatafarm.com/blog/data-access/ria-services-and-entity-framework-pocos/]
/// by Julie Lerman
/// </remarks>
public static EntityState GetEntityState(ObjectStateManager manager, object entity)
{
if (manager == null)
{
return(default(EntityState));
}
ObjectStateEntry entry;
if (manager.TryGetObjectStateEntry(entity, out entry))
{
return(entry.State);
}
else
{
return(EntityState.Detached);
}
}