Question

当通过代码功能使用NHibernate的映射时，如何将实体的Id映射到私有支持字段？

public abstract class Entity : IEntity
{
    private Guid? _id;

    protected Entity() { }

    protected Entity(Guid? id)
    {
        _id = id;
    }

    #region IEntity Members

    /// <summary>
    /// Gets the unique id for this entity.
    /// </summary>
    /// <value>The id.</value>
    public Guid? Id
    {
        get { return _id;
    }
}

映射：

public abstract class GuidKeyedClassMapping<T> : ClassMapping<T> where T : class, IEntity
{
    protected GuidKeyedClassMapping()
    {
        // What to write here???
        Id(x=> x.Id);
    }
}

尝试用字符串指出属性或字段但无济于事。

Id(x => "_id", m => m.Access(Accessor.Field));

...给我：

类型＆＃39; System.Exception＆＃39;的例外情况发生在NHibernate.dll但是未在用户代码中处理附加信息：无效表达式类型：预期ExpressionType.MemberAccess，Found Constant

Answer 1

Id(x => x.Id, m => m.Access(Accessor.Field));应该有效，因为_id匹配LowerCaseUnderscoreStrategy。注意x.Id必须像第一个代码一样指定

如何在NHibernate的代码映射中将Id映射到私有后备字段？

1 个答案: