How to get around “Internal .NET Framework Data Provider error 1025.”?

Question

I am using the Entity Framework 4.3, POCO, database first and I am getting the following error:

Internal .NET Framework Data Provider error 1025.

Answer 1

The semantics of your query look good to me; clearly, getting an internal provider error is not the intended behaviour! I would have expected some more explicit mesage about EF not being able to translate your query into a store operation, if that's in fact what the problem is.

Another way to do what you want would be:

var names = new[] {"Name1", "Name2"};
var nameCount = names.Length;

var ctx = new DatabaseContext("EFPlayingEntities");
var result = ctx.As
    .Where(a => a.Bs
                 .Select(b => b.SomeName)
                 .Intersect(names)
                 .Count() == a.Bs.Count());

(get every A such that intersecting its Bs' names with the fixed list gives all the Bs)

although I haven't tried this to see if EF can translate this successfully.

Another way:

var names = new[] {"Name1", "Name2"};

var ctx = new DatabaseContext("EFPlayingEntities");
var result = ctx.As
    .Where(a => !a.Bs.Select(b => b.SomeName).Except(names).Any());

(get every A such that the list of its Bs' names is reduced to nothing by taking out the fixed list)

also untried.