如何使用EF 4.3中的复杂密钥使用AddOrUpdate对数据进行种子设定

// 定义种子属性
public class MyEntity
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Seed { get; set; }
}

// 创建数据库
using (var context = new MyDbContext())
{
    context.MyEntities.Add(new MyEntity { Name = "John", Seed = 1 });
    context.MyEntities.Add(new MyEntity { Name = "Jane", Seed = 2 });
    context.MyEntities.Add(new MyEntity { Name = "Jim", Seed = 3 });
    context.SaveChanges();
}

// 使用 AddOrUpdate 函数更新数据
using (var context = new MyDbContext())
{
    context.MyEntities.AddOrUpdate(x => x.Seed, new List<MyEntity>
    {
        new MyEntity { Name = "John", Seed = 1 },
        new MyEntity { Name = "Jane", Seed = 2 },
        new MyEntity { Name = "Jim", Seed = 3 }
    });
    context.SaveChanges();
}