通用 C# 复制构造函数
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Generic C# Copy Constructor
提问by lomaxx
What would be the best way to write a generic copy constructor function for my c# classes? They all inherit from an abstract base class so I could use reflection to map the properties, but I'm wondering if there's a better way?
为我的 c# 类编写通用复制构造函数的最佳方法是什么？它们都继承自一个抽象基类，因此我可以使用反射来映射属性，但我想知道是否有更好的方法？
采纳答案by Marc Gravell
回答by ?yvind Skaar
Avoid reflection if you can. Each class should have the responsibility of copying its own properties, and send it further to the base method.
如果可以，请避免反射。每个类都应该负责复制自己的属性，并将其进一步发送给基方法。
回答by Vordreller
A copy constructor basically means you have a single parameter, which is the object you're going to copy.
复制构造函数基本上意味着您只有一个参数，即您要复制的对象。
Also, do a deep copy, not a shallow copy.
另外，做深拷贝，而不是浅拷贝。
If you don't know what deep and shallow copies are, then here's the deal:
如果你不知道深拷贝和浅拷贝是什么，那么这就是交易：
Suppose you're copying a class that has a single row of integers as field.
假设您正在复制一个具有单行整数作为字段的类。
A shallow copy would be:
浅拷贝将是：
public class Myclass()
{
private int[] row;
public MyClass(MyClass class)
{
this.row = class.row
}
}
deep copy is:
深拷贝是：
public class Myclass()
{
private int[] row;
public MyClass(MyClass class)
{
for(int i = 0; i<class.row.Length;i++)
{
this.row[i] = class.row[i];
}
}
}
A deep copy really gets the actuall values and puts them in a new field of the new object, whilst a shallow copy only copies the pointers.
深拷贝真正获取实际值并将它们放入新对象的新字段中，而浅拷贝仅复制指针。
With the shallow copy, if you set:
使用浅拷贝，如果你设置：
row[3] = 5;
And then print both rows, both prints will have 5 as value of the 4th number. With a deep copy however, only the first print will have this, since the rows don't have the same pointers.
然后打印两行，两个打印的第 4 个数字的值都是 5。然而，对于深拷贝，只有第一次打印才会有这个，因为行没有相同的指针。
回答by B2K
Here's a constructor that I'm using. Note that this is a shallow constructor, and rather simplistic, due to the nature of my base class. Should be good enough to get you started.
这是我正在使用的构造函数。请注意，由于我的基类的性质，这是一个浅层构造函数，而且相当简单。应该足以让你开始。
public partial class LocationView : Location
{
public LocationView() {}
// base class copy constructor
public LocationView(Location value) {
Type t = typeof(Location);
PropertyInfo[] properties = t.GetProperties();
foreach (PropertyInfo pi in properties)
{
pi.SetValue(this, pi.GetValue(value, null), null);
}
}
public Quote Quote { get; set; }
}
回答by Nikita Ilin
You may reference valueinjecter and fasterflect nuget packages and use:
您可以参考 valueinjecter 和 fastflect nuget 包并使用：
public class Myclass()
{
private string _property;
public MyClass(MyClass obj)
{
this.InjectFrom(obj.DeepClone());
}
}
