Question

参考此问题：EF4.1 Code First Complex Type as primary key

此后有变化吗？或者除了创建重复的持久性对象之外是否还有可能的解决方法？

Answer 1

解决方法是在基类中实现与PK相关的逻辑，从中派生实体。

编辑：基于引用问题的快速示例

class TestDbContext : DbContext
{
    public DbSet<Voyage> Voyages { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Voyage>()
            .HasKey(v => v.Id);

        base.OnModelCreating(modelBuilder);
    }
}

public class VoyageNumber
{
    private string _number;

    public VoyageNumber() { }

    public string Id
    {
        get
        {
            return _number;
        }
        set
        {
            if( !string.IsNullOrEmpty( _number ) )
            {
                throw new InvalidOperationException("Id already set");
            }

            if( string.IsNullOrEmpty( value ) )
            {
                throw new ArgumentException("Value cannot be null or empty string");
            }

            _number = value;
        }
    }
}

public class Voyage : VoyageNumber
{
}

EF 6/7复合类型作为主键

1 个答案: