JSON.NET为什么它添加到列表，而不是覆盖？ [英] JSON.NET Why does it Add to List instead of Overwriting?

问题描述

public class MyClass {
    public List<int> myList = new List<int> { 1337 };
    public MyClass() {}
}

var myClass = JsonConvert.DeserializeObject<MyClass>("{myList:[1,2,3]}");
Console.WriteLine(string.Join(",", myClass.myList.ToArray())); //1337,1,2,3

为什么它显示1337,1,2,3代替1,2,3？有没有一种方法/设置，使JSON.NET覆盖列表，而不是添加元素呢？

Why does it display 1337,1,2,3 instead of 1,2,3? Is there a way/setting to make JSON.NET overwrite List instead of adding elements to it?

我需要不修改构造函数的解决方案。

I need a solution that doesn't modify the constructor.

推荐答案

如果你不希望这种行为，你可以通过在 JSONSerializerSettings 对象，指定你不想重复使用实例的成员现有对象：

If you don't want this behavior, you can change it by passing in a JSONSerializerSettings object that specifies you don't want to reuse existing objects in the instance's members:

var settings = new JsonSerializerSettings
{
    ObjectCreationHandling = ObjectCreationHandling.Replace
};

var myInstance = JsonConvert.DeserializeObject<MyClass>("{myList:[1,2,3]}", settings);

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