[英]Deserialize Nested Dictionary in from Json C#
我有一個 class 這樣的東西
public class A{
public Guid userId { get; set; }
public Guid businessId { get; set; }
public Dictionary<int, long> rights { get; set; }
}
我想把這個 json 轉換成這個 class
{
"userId": "dc2af693-72e1-49a7-80aa-6416c6536bdf",
"businessId": "0110eea4-7a47-4a7c-95ea-10547ab49652",
"rights": "{\"19\":1,\"17\":15,\"18\":1,\"23\":1,\"1\":31,\"20\":3,\"3\":1,\"16\":0}",
}
但是當我試圖用 NewtonSoft.Json 轉換它時
JsonConvert.DeserializeObject<A>(json);
我收到以下錯誤Cannot Cast System.string to System.Dictionary<int,long>發生的事情是我的權利被轉換為類似這樣的字符串
"{"19":1, "17":15, "18":1, ..., "16":0}"
如果我再次反序列化這個字符串,它會按照我的意願工作,有沒有更好的方法來做到這一點。
由於rights
是字符串格式,您可以添加自定義JsonConverter
將字符串轉換為字典
public class A
{
public Guid userId { get; set; }
public Guid businessId { get; set; }
[JsonConverter(typeof(RightsSerializer))]
public Dictionary<int, long> rights { get; set; }
}
這是 RightsSerializer
public class RightsSerializer : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return objectType == typeof(Dictionary<int, long>);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
if (reader.TokenType == JsonToken.Null) return null;
var jt = JToken.Load(reader);
return JsonConvert.DeserializeObject<Dictionary<int, long>>(jt.Value<String>());
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
serializer.Serialize(writer, value);
}
}
和反序列化對象
var json = File.ReadAllText("json1.json");
var result = JsonConvert.DeserializeObject<A>(json);
將 class 更改為這樣的內容會有所幫助。 盡管您需要使代碼比這更好。
public class A
{
public Guid userId { get; set; }
public Guid businessId { get; set; }
//[JsonConverter(typeof(Dictionary<int, long>))]
public string rights { get; set; }
public Dictionary<int, long> rightss => JsonConvert.DeserializeObject<Dictionary<int, long>>(rights);
}
如果不反序列化兩次就無法做到這一點,但是您可以使用私有子類隱藏它。
public class A {
public Guid userId {get;set;}
public Guid businessId {get;set;}
public Dictionary<int, long> rights {get;set;}
private class B {
public Guid userId {get;set;}
public Guid businessId {get;set;}
public string rights {get;set;}
}
private B b;
public A (string json) {
var o = new JsonSerializerOptions();
o.AllowTrailingCommas = true;
b = JsonSerializer.Deserialize<B>(json, o);
userId = b.userId;
businessId = b.businessId;
rights = JsonSerializer.Deserialize<Dictionary<int, long>>(b.rights,o);
}
}
小提琴測試的用法:
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