在Json.NET中将Dictionary <,>序列化为数组

Question

如何使Json.NET序列化程序将IDictionary<,>实例序列化为具有键/值属性的对象数组？默认情况下,它将Key的值序列化为JSON对象的属性名称.

基本上我需要这样的东西:

[{"key":"some key","value":1},{"key":"another key","value":5}]

代替:

{{"some key":1},{"another key":5}}

我尝试添加KeyValuePairConverter到序列化程序设置但它没有任何效果.(我发现这个转换器被忽略的类型IDictionary<>,但因为它们是从其他图书馆接收,所以从改变我不能轻易改变我的对象的类型IDictionary<>,以ICollection<KeyValuePair<>>不选择我.)

Answer 1

我能够让这个转换器工作.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

public class CustomDictionaryConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return (typeof(IDictionary).IsAssignableFrom(objectType) || 
                TypeImplementsGenericInterface(objectType, typeof(IDictionary<,>)));
    }

    private static bool TypeImplementsGenericInterface(Type concreteType, Type interfaceType)
    {
        return concreteType.GetInterfaces()
               .Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == interfaceType);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        Type type = value.GetType();
        IEnumerable keys = (IEnumerable)type.GetProperty("Keys").GetValue(value, null);
        IEnumerable values = (IEnumerable)type.GetProperty("Values").GetValue(value, null);
        IEnumerator valueEnumerator = values.GetEnumerator();

        writer.WriteStartArray();
        foreach (object key in keys)
        {
            valueEnumerator.MoveNext();

            writer.WriteStartObject();
            writer.WritePropertyName("key");
            writer.WriteValue(key);
            writer.WritePropertyName("value");
            serializer.Serialize(writer, valueEnumerator.Current);
            writer.WriteEndObject();
        }
        writer.WriteEndArray();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

以下是使用转换器的示例:

IDictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("some key", 1);
dict.Add("another key", 5);

string json = JsonConvert.SerializeObject(dict, new CustomDictionaryConverter());
Console.WriteLine(json);

这是上面的输出:

[{"key":"some key","value":1},{"key":"another key","value":5}]