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Accepted
F. Iván
Asked: 2020-02-21 00:18:22 +0800 CST 2020-02-21 00:18:22 +0800 CST

How to deserialize a json that is from a class among a list of classes?

  • 772

I tell you my situation, I have a json file which I get such that:

string jsonData = System.IO.File.ReadAllText(path);

In this case, as an example, a json can be such that:

[
  {
  "nombre": "Ivan"
  },
  {
  "nombre": "Francisco"
  }
]

either

[{
  "edad": 55
}]

either

[
  {
  "dimensiones": 2500
 },{
  "dimensiones": 800
 },{
  "dimensiones": 500
 },
]

either

[
{
  "esNueva": false
}
]

The problem is that I have to deserialize it but I don't know what class it is going to belong to. As in the example suppose I have these 4 classes:

public class Persona
{
   string nombre{ get; set; }
}

public class Animal
{
   int edad{ get; set; }
}

public class Ropa
{
   bool esNueva { get; set; }
}

public class Foto
{
   int dimensiones { get; set; }
}

The idea is that the json is one of those classes but I don't know which one exactly. I've thought about making a class that resolves the string that corresponds to the json, but I don't know how to make a method that can return an object that I know but I'm not sure what it is.

How could I do this method?

c#

1 Answers

  1. Best Answer

    If you don't know which class the json belongs to, you could perform the test controlling the error

    Serialization Error Handling

    then the deserialization would be by trial and error, you deserialize each of the classes and see which one does not fail, then you know that it is that structure that coincides

    string jsonData = System.IO.File.ReadAllText(path);

var settings = new JsonSerializerSettings
{
    Error = delegate(object sender, ErrorEventArgs args)
    {
      args.ErrorContext.Handled = true;
    }
});

var persona = JsonConvert.DeserializeObject<Persona>(jsonData, settings);

if(persona != null)
{
    //si distinto de null entonces pudo deserializar
}

var animal = JsonConvert.DeserializeObject<Animal>(jsonData, settings);

if(animal != null)
{
    //si distinto de null entonces pudo deserializar
}

//igual al resto

    You try with each class and validate which one could deserialize.

    As long as you have a nullresponse, it fails and could not deserialize, the setting indicates that it does not throw the exception so you do not have to work with it try...catchand you can validate it with itif

    • 7