Question

在我的DAL中的RepositoryBase中，我有以下代码......我似乎无法弄清楚ObjectQuery query = ObjectSet; ？我接近了吗？

public IEnumerable<T> QueryObjectGraph(Expression<Func<T, bool>> filter, params string[] children)
    {
        //ObjectQuery<T> query = ObjectSet;  //nope...requires 1 type argument
        //ObjectQuery<T> query = ObjectSet<T>; //nope......type used like variable
        // ObjectQuery<T> query = ObjectSet<T>(); //nope ...type used like variable
        //ObjectQuery<T> query = new ObjectSet<T>(); //nope...no constructors defined
        IQueryable<T> query;

        foreach (var child in children)
        {
            query = query.Include(child);
        }

        return query.Where(filter);
    }

Answer 1

放松男人。不是故意听起来很粗鲁。你只是不知道自己在做什么。如果你看这里http://msdn.microsoft.com/en-us/library/dd412719.aspx，你会发现ObjectSet是ObjectQuery，所以赋值确实有效。但是你必须首先创建ObjectSet！

“因为我是专家”

看起来这个代码很有效

using (var ctx = new ModelContainer())
{
    ObjectQuery<Person> objectQuery = ctx.People;
}

和ctx.People的类型是ObjectSet

您的代码中注释掉了什么是ObjectSet？在哪里创建？

EF ObjectQuery <t> query = ObjectSet;如此接近</t>

1 个答案: