c# - 使用 JSON.NET 序列化/反序列化动态属性名称

Question

我有以下类(class):

public class MyRequest
{
    public string Type {get;set;}
    public string Source {get;set;}
}

我想从名为 Type 的值的 JSON 字段中序列化/反序列化 Source 的值，例如:

{
    "type": "bank",
    "bank": "Some value"
}

或

{
    "type": "card",
    "card": "Some value"
}

两者都绑定(bind)到 Source 属性。

Answer 1

您可以创建自定义 JsonConverter处理动态属性名称:

public class MyRequestConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(MyRequest);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JObject jo = JObject.Load(reader);
        string type = (string)jo["type"];
        MyRequest req = new MyRequest
        {
            Type = type,
            Source = (string)jo[type ?? ""]
        };
        return req;
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        MyRequest req = (MyRequest)value;
        JObject jo = new JObject(
            new JProperty("type", req.Type),
            new JProperty(req.Type, req.Source));
        jo.WriteTo(writer);
    }
}

要使用转换器，请将 [JsonConverter] 属性添加到您的类中，如下所示:

[JsonConverter(typeof(MyRequestConverter))]
public class MyRequest
{
    public string Type { get; set; }
    public string Source { get; set; }
}

这是一个有效的往返演示:https://dotnetfiddle.net/o7NDTV