我需要使用模式工厂的想法将 Person 类实体中的实体属性 Address 与 FactoryEntities 类中的表达式 linq 相关联，看看这就是我所拥有的并且我想要做的：

Address address = new Address();
address.Country = "Chile";
address.City = "Santiago";
address.ZipCode = "43532";
//Factory instance creation object
//This is idea
Person person = new FactoryEntity<Person>().AssociateWithEntity(p=>p.Address, address);

public class Person: Entity
{
    public string Name{ get; set; }
    public string LastName{ get; set; }
    public Address Address{ get; set; }
}

public class Address: Entity
{
    public string Country{ get; set; }
    public string City{ get; set; }
    public string ZipCode{ get; set; }
}

public class FactoryEntity<TEntity> where TEntity : Entity
{
    public void AssociateWithEntity<TProperty>(Expression<Func<TEntity, TProperty>> entityExpression, TProperty newValueEntity) where TProperty : Entity
    {
        if (instanceEntity == null || instanceEntity.IsTransient())
            throw new ArgumentNullException();

        /*TODO: Logic the association and validation 
        How set the newValueEntity into the property of entityExpression (x=>x.Direccion = direccion*/
    }
}

这有效：

以下辅助方法将 getter 表达式转换为 setter 委托。如果您想退货Expression<Action<T,TProperty>>而不是Action<T,TProperty>，只是不要调用Compile()方法在最后。

Note:代码来自 Ian Mercer 的博客：http://blog.abodit.com/2011/09/convert-a-property-getter-to-a-setter/ http://blog.abodit.com/2011/09/convert-a-property-getter-to-a-setter/

    /// <summary>
    /// Convert a lambda expression for a getter into a setter
    /// </summary>
    public static Action<T, TProperty> GetSetter<T, TProperty>(Expression<Func<T, TProperty>> expression)
    {
        var memberExpression = (MemberExpression)expression.Body;
        var property = (PropertyInfo)memberExpression.Member;
        var setMethod = property.GetSetMethod();

        var parameterT = Expression.Parameter(typeof(T), "x");
        var parameterTProperty = Expression.Parameter(typeof(TProperty), "y");

        var newExpression =
            Expression.Lambda<Action<T, TProperty>>(
                Expression.Call(parameterT, setMethod, parameterTProperty),
                parameterT,
                parameterTProperty
            );

        return newExpression.Compile();
    }