[英]Deserializing complex Json objects
我想反序列化一個復雜的,並且說構造不好的json。 我編寫的代碼不會反序列化對象, MovieInfo
屬性為null。 您可以在代碼中找到示例json。 我想避免使用JObject.Parse
和dynamic
對象。 我在這里想念什么?
using System.Collections.Generic;
using Newtonsoft.Json;
namespace ComplexJsonExample
{
class Program
{
static void Main(string[] args)
{
string jsonInText = @"
{
""movies"" : [
{
""Harry Potter"" : [
{ ""rating"": ""great""},
{ ""rating"": ""horrible""}
]
},
{
""Guardians of the galaxy"" : [
{ ""rating"": ""cool""},
{ ""rating"": ""awesome""}
]
}
]
}
";
var movieList = JsonConvert.DeserializeObject<MovieList>(jsonInText);
}
}
public class MovieList
{
[JsonProperty("movies")]
public IList<Movie> Movies { get; set; }
}
public class Movie
{
IDictionary<string, IList<MovieRating>> MovieInfo { get; set; }
}
public class MovieRating
{
[JsonProperty("rating")]
public string Rating { get; set; }
}
}
我認為這有點hack,但是它可以正常工作,並將json字符串反序列化為所需的格式:
class MovieConverter : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return objectType == typeof(Movie);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var movie = new Movie(){
MovieInfo = new Dictionary<string,IList<MovieRating>>()
};
while (reader.Read() && reader.Value != null)
{
var name = (string)reader.Value;
reader.Read();
var ratings = ((JArray)serializer.Deserialize(reader)).Values<string>("rating");
movie.MovieInfo.Add(name, ratings.Select(r => new MovieRating(){ Rating = r}).ToList());
}
return movie;
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
throw new NotImplementedException();
}
}
我確實必須對原始對象進行兩項更改,首先我將MovieInfo
訪問MovieInfo
公開,以便可以訪問它,其次添加JsonConverterAttribute
:
[JsonConverter(typeof(MovieConverter))]
public class Movie
{
public IDictionary<string, IList<MovieRating>> MovieInfo { get; set; }
}
這有點丑陋,但您可以這樣做:
class MovieList
{
[JsonProperty("movies")]
public Movie[] Movies { get; set; }
}
class Movie : Dictionary<string, MovieRating[]>
{
}
class MovieRating
{
[JsonProperty("rating")]
public string Rating { get; set; }
}
奇怪的是,電影是只有一個鍵(其標題)的字典,但它與JSON結構匹配。 反序列化后,您始終可以將其映射到更明智的方式。
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