在 Actions 中执行 Actions 以进行集合而不创建新集合

Question

我有对象集合，其中每个对象都包含其他对象集合。我只想以某种方式修改我的原始对象集合，不应该分配额外的内存。一切都应该发生在记忆中。

我正在寻找一些模板化的 Action 或 Func，以便通过混合使用声明性和函数式方法，不会形成新的集合，并且在内存中我的原始集合也会被修改。

下面是集合的层次结构

public class ConsignmentAddress
{
    public int ConsignmentAddressId { get; set; }
    public int AddressTypeId { get; set; }
    public string Street { get; set; }
    public string Town { get; set; }
    public string ZipCode { get; set; }
    public int ConsignmentId { get; set; }


}
public class ConsignmentLine
{
    public int ConsignmentLineId { get; set; }
    public int PackagingId { get; set; }
    public double Amount { get; set; }
    public double Weight { get; set; }
    public int ConsignmentId { get; set; }
    public int? PackagingAidId { get; set; }


}
public class PackagingAid
{
    public int PackagingAidId { get; set; }
    public int ConsignmentId { get; set; }
    public int PackagingId { get; set; }
    public double Quantity { get; set; }
}
public class Consignment
{
    public int ConsignmentId { get; set; }
    public int ClientSubsidiaryId { get; set; }
    public int ForwarderId { get; set; }
    public int Sourcepaty { get; set; }
    public int ParentId { get; set; }
    public int ProductId { get; set; }

    public ICollection<PackagingAid> PackagingAids { get; set; }
    public ICollection<ConsignmentLine> ConsignmentLines { get; set; }
    public ICollection<ConsignmentAddress> ConsignmentAddresses { get; set; }

    public Consignment()
    {
        PackagingAids = new List<PackagingAid>();
        ConsignmentLines = new List<ConsignmentLine>();
        ConsignmentAddresses = new List<ConsignmentAddress>();
    }        
}

我的目的是编写通用扩展方法，它应该对我上面提到的层次结构中的所有类型的对象进行操作。

public static class ConsignmentExtension
{
    public static T Set<T>(this T input, Action<T> updater)
    {
        updater(input);
        return input;
    }
}

我的客户端代码是首先获取列表中 10000 个对象的列表，然后仅重置几个属性（寄售、对应寄售的寄售地址、对应寄售的寄售行和对应寄售的包装辅助）

我编写的 Foreach 方法运行良好，但我希望为同一个集合提供模板化和高效的方法。

consignments.ForEach(cons => 
        {
                                        cons.ConsignmentId = -1;
                                        cons.ConsignmentAddresses.ToList().ForEach(address => 
                                        {
                                            address.ConsignmentId = -1;
                                            address.ConsignmentAddressId = -1;
                                        });
                                        cons.ConsignmentLines.ToList().ForEach(line => 
                                        {
                                            line.ConsignmentId = -1;
                                            line.ConsignmentLineId = -1;
                                            line.PackagingAidId = -1;
                                        });
                                        cons.PackagingAids.ToList().ForEach(aid => 
                                        {
                                            aid.ConsignmentId = -1;
                                            aid.PackagingAidId = -1;
                                        });                                             
        });

但我正在寻找类似声明式风格的东西。

var updatedConsignments = from consignment in consignments
                                  select consignment.Set<Consignment>(con =>
                                  {
                                      con.ConsignmentId = -1;
                                      con.ConsignmentAddresses.Set<dynamic>(address => { address.ConsignmentId = -1; address.ConsignmentAddressId = -1; });
                                      con.ConsignmentLines.Set<dynamic>(line => { line.PackagingAidId = -1; line.ConsignmentId = -1;line.ConsignmentLineId = -1; });
                                      con.PackagingAids.Set<dynamic>(aid => { aid.ConsignmentId = -1; aid.PackagingAidId = -1; });
                                  });

这有可能吗？ 提前致谢。

Answer 1

这可以写成

public static class ConsignmentExtension
{
   public static IEnumerable<dynamic> SetEach(this IEnumerable<dynamic> input, Action<dynamic> updater)
   {
       foreach (var item in input)
       {
           updater(item);
       }

       return input;
}

}

用法：

           var addresses = new [] 
            {
                new ConsignmentAddress()
            };

            addresses.SetEach(a => a.ConsignmentId = -1);

            var packages = new []
            {
                new PackagingAid()
            };
            packages.SetEach(p => p.PackagingAidId = -1);