如何使用JSON.NET序列化静态或const成员变量? [英] How to serialize static or const member variables using JSON.NET?

问题描述

我无法在任何地方找到答案，但是当我尝试使用静态或const成员变量序列化结构或类时，默认情况下它们不会序列化.如果我尝试通过设置 MemberSerialization.OptIn 来强制序列化，则会收到错误消息.

I haven't been able to find the answer to this anywhere, but when I try to serialize a struct or class with static or const member variables, they don't serialize by default. If I try to force serialization by setting MemberSerialization.OptIn, I get an error.

例如.

[JsonObject(MemberSerialization.OptIn)]
public class Test
{    
    [JsonProperty]
    public int x = 1;

    [JsonProperty]
    public static int y = 2;
}

如果我尝试使用以下方法序列化此类:

If I try to serialize this class with:

Test t = new Test();
string s = JsonConvert.SerializeObject( t );

我收到错误从测试"的"y"获取值的错误.如果y为常量，也会发生同样的情况.

I get the error Error getting value from 'y' on 'Test'. The same happens if y is const.

我的理论是，静态和const值存储在内存中的某个特殊位置，并且由于某些原因，Json序列化器死于尝试访问它们.不过，这完全是直觉，我在 C#参考中一无所获对于静态有什么帮助.我对C#还是比较陌生-到目前为止，这确实是一个好奇心问题，比什么都重要.

My theory is that static and const values are stored somewhere special in memory, and for some reason the Json serializer dies trying to access them. That's entirely a hunch though, and I see nothing in the C# Reference for Static that's of any help. I'm relatively new to C# - and this is really a curiosity question more than anything at this point.

推荐答案

如果愿意，它当然可以序列化静态变量.序列化是通过使用Reflection API检查对象和类型来完成的，这些API允许您执行任何操作"-出于技术原因，这些值无法序列化.

It could certainly serialize the static variable if it wanted to. Serialization is done by inspecting objects and types with the Reflection APIs, and those APIs allow you to do "anything" -- there is no technical reason these values cannot be serialized.

但是，出于逻辑原因，默认情况下不支持此操作:这没有多大意义.您正在序列化一个 instance ，并且 static 或 const 成员在逻辑上不是实例的一部分，而是整个类的一部分.

There is, however, a logical reason not to support this by default: it doesn't make much sense. You are serializing an instance, and static or const members are not logically part of an instance but of the class as a whole.

也就是说，如果它是一个属性，您仍然可以序列化 static 成员:

That said, you can still serialize static member if it's a property:

[JsonProperty]
public static int y { get; set; } // this will be serialized

当然，您可以通过创建自定义的 JsonConverter 来完全覆盖序列化器的行为.

And of course you can completely override the serializer's behavior by creating a custom JsonConverter.

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