如何检查附加到 EF 上下文的 POCO 的状态？

Question

What is the way to check the State of an entity which is a POCO (not derived from EntityObject) and that is attached to the EF context?

Thanks!

Answer 1

If you are using the DbContext and c is your entity reference

            var state = Context.Entry(c).State;

if you are using ObjectContext.

//if x is your entity reference
var state = context.ObjectStateManager.GetObjectStateEntry(x);

Answer 2

if you are employing an identifier field and using DBContext , you may check using the following, assuming that the Id of entity is entityId;

if(Context.Entities.Local.Any(q => q.Id == entityId))
{
    // already attached to the context
}

refer to this :

The Local property of DbSet provides simple access to the entities of the set that are currently being tracked by the context and have not been marked as Deleted. Accessing the Local property never causes a query to be sent to the database.