LinqToSQL and the exception “ ExecuteReader requires an open and available Connection.”

问题

I have a collection called dbUsers of type IQueryable

These are pulled from a linqtosql database context i.e.

IQueryable<Data.LinqToSQL.User> dbUsers = DBContext.Users

Calling ToList on this object:

IList<Data.LinqToSQL.User> users = dbUsers.ToList();

Results in an exception:

ExecuteReader requires an open and available Connection. The connection's current state is connecting.

What am I doing wrong here?

Cheers

回答1:

see if this works for you:

IList<Data.LinqToSQL.User> users = (from u in DBContext.Users select u).ToList();

if not you might need to do something like:

DBContext context = new DBContext();
IList<Data.LinqToSQL.User> users = (from u in context.Users select u).ToList();

回答2:

I think this is a threading problem with the DataContext. I am getting similar problems. Check this question for more details.

Additionally read this and this.

来源：https://stackoverflow.com/questions/441293/linqtosql-and-the-exception-executereader-requires-an-open-and-available-conne