Question

是否可以建立基于实体框架中的条件的关系？我的模型看起来像这样......

public class Document
{
    public int Id { get; set; }
    public string Name { get; set; }
    public OwnerType OwnerType { get; set; }
    public int OwnerId { get; set; }

    public virtual Organization OrganizationOwner { get; set; }
    public virtual User UserOwner { get; set; }
}

public enum OwnerType
{
    Organization = 1,
    User = 2
}

public class Organization
{
    public int Id { get; set; }
    public string Name { get; set; }

    //[other properties specific to Organization]

    public virtual List<Documents> Documents { get; set; }
}

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }

    //[other properties specific to User]


    public virtual List<Documents> Documents { get; set; }
}

所以，我想要建立一个关系，以便在OwnerType == OwnerType.Organization时自动填充Document实例的OrganizationOwner属性，并在OwnerType == OwnerType.User时填充UserOwner属性

这是否可以在EntityFramework中建立这种关系 - Code First？在映射中有这样的东西......

EntityTypeConfiguration<Document>.HasOptional(d => d.OrganizationOwner)
    .WithMany(o => o.Documents)
    .HasForeignKey(d => d.OwnerId)
    .Where(d => d.OwnerType == OwnerType.Organization);

EntityTypeConfiguration<Document>.HasOptional(d => d.UserOwner)
    .WithMany(u => u.Documents)
    .HasForeignKey(d => d.OwnerId)
    .Where(d => d.OwnerType == OwnerType.User);

我希望能够在上下文中设置Linq查询时利用OrganizationOwner和UserOwner上的连接，这样我就不必为每个Document对这些实体进行单独选择。这种关系是否受到支持，或者有更好的方法吗？感谢。

具有条件关系的实体框架

0 个答案: