how to generate json string with an integer as key?

Question

I want to generate json string like this in C# language

{
  "error": "0",
  "message": "messages",
  "data": {
    "version": "sring",
    "1": [
      {
        "keyword": "",
        "title": ""
      },
      {
        "keyword": "",
        "title": ""
      }
    ],
    "2": [
      ...
    ],
    "3": [
      ...
    ]
  }
}

there is a problem here, "1":[{},{}],how to generate this part? I'm using asp.net mvc project by the way, I want to return this json string to the client web browser.

Answer 1

This response can be simply generated using Dictionary<string, object> with arrays as values.

public class KeywordTitle
{
    public string keyword { get; set; }
    public string title { get; set; }
}

public class Response
{
    public string error { get; set; }
    public string message { get; set; }
    public Dictionary<string, object> data { get; set; }
}

var dictionary = new Dictionary<string, object> {
    {"version", "sring"}
};

dictionary.Add("1", new []
{
    new KeywordTitle { keyword = "", title = "" },
    new KeywordTitle { keyword = "", title = "" },
    new KeywordTitle { keyword = "", title = "" }
});

JsonConvert.SerializeObject(new Response
{
    error = "0",
    message = "messages",
    data = dictionary
});

It generates:

{
    "error" : "0",
    "message" : "messages",
    "data" : {
        "version" : "sring",
        "1" : [{
                "keyword" : "",
                "title" : ""
            }, {
                "keyword" : "",
                "title" : ""
            }, {
                "keyword" : "",
                "title" : ""
            }
        ]
    }
}

If it is your API, then it is a good idea to extract version in order to make all objects in data be of the same type, and keys of type int.