Convert string to JSON object and send it as response

Question

I am constructing a string like the following:

List<string> itemList = new List<string>();

foreach (i in items)
{
 itemList.Add("{ type: " + i.DocumentType + " ,id: " + i.ID + " ,name: " + i.name + " }" );
}

I want to convert the itemList to a JSON object and return it as response in my controller.

Please help.

What framework are you using? ASP.NET Web API? ASP.NET MVC? ASP.NET Core MVC? — mason, Apr 28 '20 at 16:37
why are you constructing List instead of creating a list of objects? — ssilas777, Apr 28 '20 at 16:42
ssilas777, could you please guide me to create a list of objects . — Aziz Qureshi, Apr 28 '20 at 16:43
Did you read the Newtonsoft documentation? It shows lots of examples. And there are many many other examples online using that library, including on this site. It should not be hard to search for. Do you really need to ask people to repeat it again? Do some basic research, then ask us if you have a problem with the code you're trying. Or check the answers below, which already show examples for you. — ADyson, Apr 28 '20 at 16:46

score 4 · Accepted Answer · answered Apr 28 '20 at 16:45

In ASP.Net MVC you could use Linq to get your List in your desired style and then convert to Json using Json(). ie:

public JsonResult GetMyItems()
{
   var myItems = items.Select(i => new { 
                    type = i.DocumentType,
                    id = i.ID,
                    name = i.name
                 });

   return Json(myItems, JsonRequestBehavior.AllowGet);
}

score 1 · Answer 2 · answered Apr 28 '20 at 16:45

1

See Serializing and Deserializing JSON

public class Data {
 public Data(string type, long id, string name) {
  Type = type;
  Id = id;
  Name = name
 }
 public string Type { get; set; }
 public long Id { get; set; }
 public string Name {get; set;
}

var itemList = items.Select(i => Data(i.DocumentType , i.ID, i.name).ToList();
string json = JsonConvert.SerializeObject(itemList);

answered Apr 28 '20 at 16:45

Nafis Islam

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Note that this is not what OP wants to do even if they try to ask for it. – Alexei Levenkov Apr 28 '20 at 16:47

Convert string to JSON object and send it as response

2 Answers2