How to create a Linq To Entities expression

HI, I'm using Linq To Entities and I'd like to convert this

return db.Products
         .Where(p => p.idUser.Equals(id) && 
                     p.Category.Genre.Any(g => g.visible))

into something like

Func<Genre, bool> expr = g => g.visible

return db.Products
         .Where(p => p.idUser.Equals(id) && 
                     p.Category.Genre.Any(expr))

s开发者_如何转开发o I can add more complexity with something like this

Func<Genre, bool> expr = g => g.visible
expr += g => g.position < 5

But I always have an 'internal 1025 error .NET'. Can anyone help me, please? Thanks.

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You need to use Expressions, not delegates. You can use the PredicateBuilder class by Joseph Albahari to build your predicate dynamically :

Expression<Func<Genre, bool>> expr = g => g.visible;
expr = expr.And(g => g.position < 5);