Question 247351 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Convert Json string to a different type

I have an object like this

"maqVeicEquip": 
{
    "item": 
    {
        "tipoMaq": "03",
        "marca": "DAF",
        "idadeMediaFrota": "1",
        "quantidade": "2",
        "indOnus": "true",
        "valorMedio": "0.00",
        "outrasInformacoes": "XF105 FTT510 - BCO PACCAR",
        "percPropriedade": "100.00"
    }
}

I can’t deserialize it because the item is a List<>. You guys know some way to force deserialize item as a List<Item>?

Here is my class

public class MaqVeicEquip
{
    public List<Item> item { get; set; }
    
    public class Item
    {
        public string tipoMaq { get; set; }
        public string marca { get; set; }
        public string idadeMediaFrota { get; set; }
        public string quantidade { get; set; }
        public string indOnus { get; set; }
        public string valorMedio { get; set; }
        public string outrasInformacoes { get; set; }
        public string percPropriedade { get; set; }
    }
}
Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    thank you guys, i changed from

    public List<Item> item { get; set; }

    to

    public object item { get; set; }

    and solve the issue. using dynamic as type also solve the issue.


  2. 0

    You can not change the rules of deserialization. An object will deserialize to an object & an array/list will deserialize to List<Item>. So, I would suggest you declare the Item as an Object rather than a List<Item>. However, you may create a read-only property that may convert the Item Object to List<Item> and finally return List<Item>.

    Login or Signup to reply.
  3. 0

    If you use Newtonsoft.Json for serialisation, you can

    a) Define a custom converter as follows:

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

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JToken token = JToken.Load(reader);
        if (token.Type == JTokenType.Array)
        {
            return token.ToObject<List<T>>();
        }
        return new List<T> { token.ToObject<T>() };
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        List<T> list = (List<T>)value;
        if (list.Count == 1)
        {
            serializer.Serialize(writer, list[0]);
        }
        else
        {
            serializer.Serialize(writer, list);
        }
    }
}

    b) Apply a custom converter to the property of your class:

    public class MaqVeicEquip
{
    [JsonConverter(typeof(SingleOrArrayConverter<Item>))]
    public List<Item> item { get; set; }

    public class Item
    {
        public string tipoMaq { get; set; }
        public string marca { get; set; }
        public string idadeMediaFrota { get; set; }
        public string quantidade { get; set; }
        public string indOnus { get; set; }
        public string valorMedio { get; set; }
        public string outrasInformacoes { get; set; }
        public string percPropriedade { get; set; }
    }
}

    c) Deserialise the JSON to an object:

    var str = @"
{
    ""item"": 
    {
        ""tipoMaq"": ""03"",
        ""marca"": ""DAF"",
        ""idadeMediaFrota"": ""1"",
        ""quantidade"": ""2"",
        ""indOnus"": ""true"",
        ""valorMedio"": ""0.00"",
        ""outrasInformacoes"": ""XF105 FTT510 - BCO PACCAR"",
        ""percPropriedade"": ""100.00""
    }
}
";

var obj = JsonConvert.DeserializeObject<MaqVeicEquip>(str);

    Now, the obj should consist of the following data:

    enter image description here

    Hope this helps or at least pushes you in a good direction.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search