DataContractSerializer 不调用我的构造函数? [英] DataContractSerializer doesn't call my constructor?

问题描述

我刚刚意识到一些疯狂的事情，我认为这是完全不可能的:反序列化对象时，DataContractSerializer 不会调用构造函数！

I just realized something crazy, which I assumed to be completely impossible : when deserializing an object, the DataContractSerializer doesn't call the constructor !

以这个类为例:

[DataContract]
public class Book
{
    public Book()
    { // breakpoint here
    }

    [DataMember(Order = 0)]
    public string Title { get; set; }
    [DataMember(Order = 1)]
    public string Author { get; set; }
    [DataMember(Order = 2)]
    public string Summary { get; set; }
}

当我反序列化那个类的对象时，断点没有被命中.我完全不知道这是怎么可能的，因为它是这个对象的唯一构造函数！

When I deserialize an object of that class, the breakpoint is not hit. I have absolutely no idea how it is possible, since it is the only constructor for this object !

我假设编译器可能因为 DataContract 属性而生成了一个额外的构造函数，但我无法通过反射找到它...

I assumed that perhaps an additional constructor was generated by the compiler because of the DataContract attribute, but I couldn't find it through reflection...

所以，我想知道的是:如何在不调用构造函数的情况下创建我的类的实例??

So, what I'd like to know is this : how could an instance of my class be created without the constructor being called ??

注意:我知道我可以在反序列化开始时使用 OnDeserializing 属性来初始化我的对象，这不是我的问题的主题.

NOTE: I know that I can use the OnDeserializing attribute to initialize my object when deserialization begins, this is not the subject of my question.

推荐答案

DataContractSerializer(如 BinaryFormatter)不使用 any 构造函数.它将对象创建为空内存.

DataContractSerializer (like BinaryFormatter) doesn't use any constructor. It creates the object as empty memory.

例如:

    Type type = typeof(Customer);
    object obj = System.Runtime.Serialization.
        FormatterServices.GetUninitializedObject(type);

假设反​​序列化过程(或必要时回调)将完全初始化它.

The assumption is that the deserialization process (or callbacks if necessary) will fully initialize it.

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