C#/PLINQO - Detach and re-attach the same entity to the same context fail

I am using PLINQO for my LINQ-TO-SQL data layer.

I have the following piece of code (not real code, just to re-produce the error I am getting):

var context = new MyDataContext();
var user = context.User.GetByKey("username");
user.Detach();
context.User.Attach(user);

Executing the last line of code results with InvalidOperationException with the following error message: "Cannot attach an entity that already exists."

I thought that the Detach method should detach the entity from the con开发者_Go百科text and it seems that it just removing the link from the entity to the context but the context still "remembers" the entity.

How can I detach the entity completely so I will not get the error ?

Thanks, Koby

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I came into conclusion that my desing was incorrect and did not take into account the restrictions on linqtosql, I did changes to the code so situation like that will not happen and if it will an exception will be thrown.

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Try to use ObjectStateManager with attached entity:

var context = new MyDataContext();
var user = context.User.GetByKey("username");
// change field values
...
user.AnyUserField = "123";
...
context.AcceptAllChanges();
context.ObjectStateManager.ChangeObjectState(user, EntityState.Added); // or use EntityState.Modified if it already exist anywhere
context.SaveChanges();