C# 将列表复制到另一个列表（新列表不应引用旧列表）
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Copying a list to another (new list should not reference to old list)
提问by Sunny
Possible Duplicate:
How do I clone a generic list in C#?
可能的重复：
如何在 C# 中克隆通用列表？
I want to copy a list to another in C#. The problem is that existing methods like copytocreates a new list from another list. But if I make some changes to new list the old list also gets changed. Its because of their reference type behaviour. If there any way (apart from foreachloop) to create a new list from another list which will not reference the same object
我想在 C# 中将一个列表复制到另一个列表。问题在于现有方法如copyto从另一个列表创建一个新列表。但是如果我对新列表进行一些更改，旧列表也会更改。这是因为它们的引用类型行为。如果有任何方法（除了foreach循环）从另一个不会引用同一对象的列表中创建一个新列表
回答by Roy Dictus
So what you want is a deep copy of the list -- where the 2nd list contains copies of the elements of the 1st list. In that case, when an element of any list changes, the other list remains unchanged.
所以你想要的是列表的深层副本——其中第二个列表包含第一个列表元素的副本。在这种情况下，当任何列表的元素发生变化时，另一个列表保持不变。
How to do that, depends on whether the elements of your list are reference types or value types. A value type list can be easily cloned like so:
如何做到这一点，取决于列表中的元素是引用类型还是值类型。值类型列表可以很容易地克隆，如下所示：
List<int> deepCopy = new List<int>(originalList);
For a reference type list, you can use serialization, like so:
对于引用类型列表，您可以使用序列化，如下所示：
public List<MyObject> DeepCopy()
{
MemoryStream ms = new MemoryStream();
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(ms, this);
ms.Position = 0;
return (List<MyObject>) bf.Deserialize(ms);
}
