如何使用 JSON.NET 将从 List 派生的类型序列化为类似数组的对象

Question

考虑以下派生自List 的类：

public class Foo : List<string>
{
    public string Bar { get; set; }
}

使用 JSON.NET 对其进行序列化会转储 Bar 属性并生成一个常规数组：

var foo = new Foo() { "a", "b", "c" };
foo.Bar = "baz";
JsonConvert.SerializeObject(foo); // ["a","b","c"]

我可以做些什么来获得以下类似数组的对象作为我的序列化结果？

{"0": "a", "1": "b", "2": "c", "length": 3, "bar": "baz"}

自定义序列化程序是唯一的方法，还是有 JSON.NET 设置可以为我做到这一点？

Answer 1

我认为获得所需内容的最简单的方法是执行以下操作：

var foo = new Foo() { "a", "b", "c" };
foo.Bar = "baz";

var data = foo
    .Select((value, index) => new { value, index })
    .ToDictionary(wrapper => wrapper.index.ToString(), wrapper => (object)wrapper.value);

data.Add("length", foo.Count);
data.Add("bar", foo.Bar);

var json = JsonConvert.SerializeObject(data);
//{"0":"a","1":"b","2":"c","length":3,"bar":"baz"}

为具有任意数量属性的所有元素解决此问题的更通用的方法将是此代码：

var foo = new Foo() { "a", "b", "c" };
foo.Bar = "baz";
foo.Beer = "beer";

var json = GetJsonWithItemsAndProperties(foo);
//{"0":"a","1":"b","2":"c","length":3,"Bar":"baz","Beer":"beer"}

//...//

private static string GetJsonWithItemsAndProperties<T>(IReadOnlyCollection<T> listWithProperties)
{
    var data = listWithProperties
        .Select((value, index) => new {value, index})
        .ToDictionary(wrapper => wrapper.index.ToString(), wrapper => (object) wrapper.value);

    data.Add("length", data.Count);

    listWithProperties.GetType()
        .GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance |
                        System.Reflection.BindingFlags.DeclaredOnly).ToList()
        .ForEach(p => data.Add(p.Name, p.GetValue(listWithProperties)));

    return JsonConvert.SerializeObject(data);
}