以以下三张表为例。

SpecificationAttribute对应多个SpecificationAttributeOption。所以他们的关系是一对多。

在SpecificationAttribute。要先定义SpecificationAttributeOption的字段 。

如下所示。

private ICollection<SpecificationAttributeOption> _specificationAttributeOptions;

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定义字段后。就可以定导航关系了。

       /// <summary>        /// Gets or sets the specification attribute options        /// </summary>        public virtual ICollection<SpecificationAttributeOption> SpecificationAttributeOptions        {            get { return _specificationAttributeOptions ?? (_specificationAttributeOptions = new List<SpecificationAttributeOption>()); }            protected set { _specificationAttributeOptions = value; }        }

反之在SpecificationAttributeOption中SpecificationAttribute是一的一端。

所以在SpecificationAttributeOption只要定义一个就够了。当然的定义SpecificationAttributeId

代码如下。

        /// <summary>        /// Gets or sets the specification attribute identifier        /// </summary>        public int SpecificationAttributeId { get; set; }

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同时导航关系如下所示

        /// <summary>        /// Gets or sets the specification attribute        /// </summary>        public virtual SpecificationAttribute SpecificationAttribute { get; set; }

这样就完成了一对多的关系。总结如下：一对多这种关系，则在一的端把多的端定义成为

这个是定义字段    private ICollection<T> _xxxxxxxs;

接着定义属性     
        /// <summary>        /// Gets or sets the product specification attribute        /// </summary>        public virtual ICollection<T> Ts        {            get { return _xxxxxxxxs ?? (_xxxxxxxxs  = new List<Ts>()); }            protected set { _xxxxxxxxs  = value; }        }
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这样就完成了在一的端对.多端的定义

在多的端.只要把一的这一端的Id定义下..

        public int SpecificationAttributeOptionId { get; set; }         public virtual SpecificationAttributeOption SpecificationAttributeOption { get; set; }

OK.完成