JSON.net - 字段是字符串或List <string>

Question

我有一种情况,JSON从服务器REST返回的返回一个Movie-objects列表,所有这些都是通过大量信息进行的.该REST服务结果中的几个字段根据可用信息而变化.

一个例子:电影总是有一些屏幕截图(图像),演员和导演.根据所讨论的电影,可能有一个或多个图像,一个或多个演员和一个或多个导演.几个案例的示例JSON:

{
    "title": "Movie title",
    "images": [
        "http://www.url.com/img_0.jpg",
        "http://www.url.com/img_1.jpg",
        "http://www.url.com/img_2.jpg",
        "http://www.url.com/img_3.jpg",
        "http://www.url.com/img_4.jpg"
    ],
    "actors": [
        "Steven Berkoff",
        "Nikolaj Coster-Waldau",
        "Julie Cox"
    ],
    "directors": "Simon Aeby"
},
{
    "title": "Another movie",
    "images": "http://www.url.com/img_1.jpg",
    "actors": "actor 1"
    "directors": [
        "Justin Bieber",
        "Justin Timberlake"
    ]
}

问题是,使用JSON.net,我如何创建一个处理这个问题的转换器？我一直在搜索互联网,但仍未找到解决方案.

关于同一个问题的另一个问题:如果字段是字符串列表或简单字符串,如何使JSON.NET以任何方式创建List(如果只是一个简单的字符串,则创建一个包含一个成员的列表)

编辑:这个REST服务不受我的控制

Answer 1

好吧,我这样做很有趣,但不要认为是有用的或最好的方式,无论如何......

将"动态"属性声明为对象,然后创建方法以获取像ImagesAsList或ImagesAsString之类的属性.我用扩展方法做到了.....

var movies = JsonConvert.DeserializeObject<List<Movie>>(str);

类

class Movie
{

    [JsonProperty("title")]
    public string Title { get; set; }

    [JsonProperty("images")]
    public object Images { get; set; }

    [JsonProperty("actors")]
    public object Actor { get; set; }

    [JsonProperty("directors")]
    public object Directors { get; set; }
}

扩展方法

static class MovieExtension
{
    public static List<string> ImagesAsList(this Movie m)
    {
        var jArray = (m.Images as JArray);
        if (jArray == null) return null;

        return jArray.Select(x => x.ToString()).ToList();
    }

    public static string ImagesAsString(this Movie m)
    {
        return m.Images as string;
    }

}

编辑

在阅读@yamen评论后,我做了一些改动,如:

var settings = new JsonSerializerSettings();
settings.Converters.Add(new MoviesConverter());

var movies = JsonConvert.DeserializeObject<List<Movie>>(str, settings);

类

class Movie
{

    [JsonProperty("title")]
    public List<string> Title { get; set; }

    [JsonProperty("images")]
    public List<string> Images { get; set; }

    [JsonProperty("actors")]
    public List<string> Actor { get; set; }

    [JsonProperty("directors")]
    public List<string> Directors { get; set; }
}

变流器

class MoviesConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return (objectType == typeof(string)) || (objectType == typeof(List<string>)) ;
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.StartArray)
        {
            var l = new List<string>();
            reader.Read();
            while (reader.TokenType != JsonToken.EndArray)
            {
                l.Add(reader.Value as string);

                reader.Read();
            }
            return l;
        }
        else
        {
            return new List<string> { reader.Value as string };
        }
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        //ToDo here we can decide to write the json as 
        //if only has one attribute output as string if it has more output as list
    }
}