Converting JSON to Object fails - Cannot deserialize the current JSON object into System.Collections.Generic.List

Question

I\'m using the API of www.textlocal.in, which returns a JSON formatted object.

JSON

{  
   \"warnings\":[  
      {  
         \"messag         


        

Answer 1

Based on string you class structure should be like this :

public class Warning
{
    public string message { get; set; }
    public string numbers { get; set; }
}

public class Message
{
    public int num_parts { get; set; }
    public string sender { get; set; }
    public string content { get; set; }
}

public class Message2
{
    public string id { get; set; }
    public long recipient { get; set; }
}

public class RootObject
{
    public List<Warning> warnings { get; set; }
    public int balance { get; set; }
    public int batch_id { get; set; }
    public int cost { get; set; }
    public int num_messages { get; set; }
    public Message message { get; set; }
    public string receipt_url { get; set; }
    public string custom { get; set; }
    public List<string> inDND { get; set; }
    public List<Message2> messages { get; set; }
    public string status { get; set; }
}

---

It looks like your class structure is not proper, Make use of visual studio and generate C# class from json string and then using that generated class try to deserialize class.

Read : Visual Studio Generate Class From JSON or XML

Answer 2

Looks like this is a very old post, still thought of answering.

First of all, your Json data is singular which means, either

var a = JsonConvert.DeserializeObject<List<jsonToObj[]>>(richTextBox1.Text);

or

var a = JsonConvert.DeserializeObject<List<jsonToObj>>(richTextBox1.Text);

may not work for you.

You can either try:

var a = JsonConvert.DeserializeObject<jsonToObj>(richTextBox1.Text);

or

enclose the data with [ and ], which would do the trick.

make sure your parsing single object vs list of objects.

Answer 3

I simulated your problem and made the following changes that worked:

1. Change the method that deserializes to this:

   var a = JsonConvert.DeserializeObject<jsonToObj>(richTextBox1.Text);
   

   The result of the JSON you receive is not a List, so it will not work to deserialize to List<>.

2. The recipient property of the messages class receives values larger than an integer, so it must be transformed into a long like this:

   public long recipient { get; set; }
   

These changes solve your problem.

Answer 4

First of all you have to figure out what your API returns.

Right now you're trying to parse a List of jsonToObj Arrays (List<jsonToObj[]>). You have to decide whether to use a jsonToObj[] or List<jsonToObj> or a simple jsonToObj which your API provides now:

var a = JsonConvert.DeserializeObject<jsonToObj>(richTextBox1.Text);

But this then throws:

JSON integer 918819437284 is too large or small for an Int32. Path 'messages[0].recipient', line 25, position 33."

So make sure you use a Long for that.

public class messages
{
    public string id { get; set; }
    public long recipient { get; set; }
}

Furthermore you can add inDND to your jsonToObj class if you need the info:

public class jsonToObj
{
  ...
  public string[] inDND { get; set; }
  ...
}