ADO实体框架帮助

当然。我有 a long presentation on this .

作为对您问题的简单回答,您可以使用 ObjectQuery<T> 性质。

返回对象列表:

IEnumerable<Customer> result = Context.Customers;
return result;

返回一个对象:

return Context.Customers.Where(c => c.Id == someId).First();

投影到演示模型上:

return (from c in Customers
        where c.Id == someId
        select new CustomerPresentation
        {
            Id = c.Id,
            Name = c.Name,
            OrderCount = c.Orders.Count(),
            PhoneNumbers = from p in c.PhoneNumbers
                           select new PhoneNumberPresentation
                           {
                               AreaCode = p.AreaCode,
                               // etc.
                           },
            // etc.
        }).First();