EF3 核心内存数据库 OrderBy "sequence contains no elements" 异常

Question

这在连接到 SQL 时工作正常，但在使用内存数据库时抛出异常

Actors 集合在 Movie 构造函数中初始化为 new List<Actor>。

public class Actor
{
    public int ActorId { get; set; }
    public string Name { get; set; }
}

public class Movie
{
    public Movie()
    {
        Actors = new List<Actor>();
    }

    public int MovieId { get; set; }
    public string Name { get; set; }

    public virtual ICollection<Actor> Actors { get; set; }
}

var searchQuery = context.Movies.Where(m => m.Name == "Jaws");
searchQuery = searchQuery.OrderBy(m => m.Actors.Min(a => a.BirthDate ?? DateTime.MaxValue));

Answer 1

试试这个，在构造函数中删除 Actor = new List<Actor>

public Movie()
{
}

在您的查询中 .Include(m => m.Actor)

var searchQuery = context.Movies.Include(m => m.Actors).Where(m => m.Name == "Jaws");

EF3 核心内存数据库 OrderBy "sequence contains no elements" 异常

EF3 core in-memory database OrderBy "sequence contains no elements" exception

entity-framework

linq-to-sql