.net 如何在JsonConverter中将数组转换为对象

我想通过使用JsonConverter将属性的类型从数组更改为对象。例如，我有这样一个属性[{Name:aaa}]。序列化之后，我希望得到如下结果{{uu po:Add，Objects:[{Name:aaa}]}

因此，我创建了一个用于自定义序列化程序的类：

public class Serializer : ISerializer
{
    public JsonSerializerSettings SerializerSettings { get; set; }

    public Serializer()
    {
        SerializerSettings = new JsonSerializerSettings();
        SerializerSettings.Converters.Add(new ParseArrayToObjectJsonConverter());
    }

    public class ParseArrayToObjectJsonConverter : JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            if (objectType.GetTypeInfo().Name.EndsWith("Array"))
            {
                return true;
            }
            return false;
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {

        }
    }
}

我看到JsonWriter有一个属性public WriteState WriteState{get；}，它可以返回如下枚举：public enum WriteState{Error=0，Closed=1，Object=2，Array=3，Constructor=4，property=5，Start=6}

---

在WriteJson方法中，writer.WriteEstate的类型是WriteEstate.Array，但问题是我无法设置WriteEstate的值以返回对象。您是否有其他解决方案来处理此问题？

我认为您误解了如何在JSONTransfer中使用JsonWriter。你永远不应该弄乱作者的财产。它是一个只读属性，指示写入程序当前正在写入的内容。你不能直接改变它。相反，您应该使用编写器的WriteXxx方法来实际写出所需的JSON。下面是如何实现将数组包装到对象中的JsonConverter：

public class WrapArrayInObjectJsonConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        // This will cause the converter to wrap ALL IEnumerables (except strings) in an object.
        return typeof(IEnumerable).IsAssignableFrom(objectType) && objectType != typeof(string);

        // If you only want to this converter to wrap specific kinds of arrays, change this
        // method accordingly.  For example, this will only wrap Foo[] or List<Foo>:
        //return typeof(IEnumerable<Foo>).IsAssignableFrom(objectType);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        IEnumerable array = (IEnumerable)value;
        writer.WriteStartObject();
        writer.WritePropertyName("__po");
        writer.WriteValue("Add");
        writer.WritePropertyName("Objects");
        writer.WriteStartArray();
        foreach (object item in array)
        {
            serializer.Serialize(writer, item);
        }
        writer.WriteEndArray();
        writer.WriteEndObject();
    }

    public override bool CanRead
    {
        get { return false; }
    }

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

输出：

{"__po":"Add","Objects":[{"Name":"aaa"},{"Name":"bbb"}]}

---

Fiddle:

JsonWriter拥有此属性public WriteState WriteState{get；}谁可以返回这样的枚举“public enum WriteState{Error=0，Closed=1，Object=2，Array=3，Constructor=4，property=5，Start=6}”'在我的情况下Writer.WriteState的值是WriteState.Array，但问题是我无法设置Writer.WriteState的值以返回对象。这正是我需要的。非常感谢您。@Brian先生：

{"__po":"Add","Objects":[{"Name":"aaa"},{"Name":"bbb"}]}