Entity Framework 6在运行时检查导航属性是多对多还是一对多的方法

Question

For example, I have the following classes

class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<Team> Teams { get; set; }
    public ICollection<Address> Addresses { get; set; }
}
class Team
{
    public int Id { get; set; }
    public string Name { get; set; }
    public ICollection<User> Users { get; set; }
}
class Address
{
    public int Id { get; set; }
    public string AddressType { get; set; }
    public string Address { get; set; }
    public int UserId { get; set; }
}

I have a way to determine at runtime if property is navigation property using ObjectContext metadata thanks to entity framework check if property is navigation property

But what I need additionally is to know if property is many-to-many (like Teams property in the example above) or one-to-many (like Addresses). Is there a way to do this?

Answer 1

In case someone will need same thing - here is some way of doing it:

var navigationProperties = objectContext.MetadataWorkspace
                        .GetItems<EntityType>(DataSpace.OSpace)
                        .Single(p => p.FullName == typeof(User).FullName)
                        .NavigationProperties;

var one = navigationProperties.Where(navigationProperty => navigationProperty.FromEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One).ToList();
var many = navigationProperties.Where(navigationProperty => navigationProperty.FromEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many).ToList();