T＆GT;名单，LT深复印件; [英] Deep copy of List<T>

问题描述

我想做一个泛型列表的深层副本，并想知道是否有任何其他方式然后创建复制方法，一次竟在复制每个成员之一。我有一个类，它看起来有点像这样的：

I'm trying to make a deep copy of a generic list, and am wondering if there is any other way then creating the copying method and actually copying over each member one at a time. I have a class that looks somewhat like this:

public class Data
{            
    private string comment;
    public string Comment
    {
        get { return comment; }
        set { comment = value; }
    }

    private List<double> traceData;
    public List<double> TraceData
    {
        get { return traceData; }
        set { traceData = value; }
    }
}

和我有上面的数据，即列表℃的列表;数据＆GT; 。我试图做的是情节名单的子集的跟踪数据到一个图形，可能会进行一些缩放或扫上的数据。我显然不需要绘制列表中的一切，因为他们不适合在屏幕上。

And I have a list of the above data, i.e List<Data>. What I'm trying to do is plot a trace data of the subset of List onto a graph, possibly with some scaling or sweeping on the data. I obviously don't need to plot everything in the list because they don't fit into the screen.

我最初试图获取列表的使用 List.GetRange（）法的子集，但似乎下列表＆LT;双＆GT; 正在复制浅，而不是深复制。当我得到的子集再次使用List.GetRange（），我得到previously修改的数据，其他地方没有检索到的原始数据。

I initially tried getting the subset of the list using the List.GetRange() method, but it seems that the underneath List<double> is being shallow copied instead of deep copied. When I get the subset again using List.GetRange(), I get previously modified data, not the raw data retrieved elsewhere.

谁能给我对如何处理这个方向？非常感谢。

Can anyone give me a direction on how to approach this? Thanks a lot.

推荐答案

在C＃中解决这个惯用的方法是实施的 ICloneable 在数据，并写了 ，做深拷贝克隆办法（然后presumably可以一次克隆列表的一部分 Enumerable.CloneRange 方法）。没有任何内置的伎俩或框架的方法，使其比这更容易。

The idiomatic way to approach this in C# is to implement ICloneable on your Data, and write a Clone method that does the deep copy (and then presumably a Enumerable.CloneRange method that can clone part of your list at once.) There isn't any built-in trick or framework method to make it easier than that.

除非内存和性能是一个真正的问题，我建议你尽量重新设计它的不可变运行数据的对象，不过，来代替。它会风要简单得多。

Unless memory and performance are a real concern, I suggest that you try hard to redesign it to operate on immutable Data objects, though, instead. It'll wind up much simpler.

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