String builder in c# json problem with \"

Question

I created an exaple to demonstrate the problem. I am trying by string builder create a json but there is one problem when the Model.Code contains the \". If the model value contains double quote json is not valid.

public class Model
{
    public string Name { get; set; }
    public string Code { get; set; }
}

        List<Model> list = new List<Model>();
        list.Add(new Model()
        {
            Name = "Test1",
            Code = "124565123"
        });

        list.Add(new Model() {
            Name = "Test2",
            Code= "123 \"45"
        });

        list.Add(new Model()
        {
            Name = "Test3",
            Code = "456"
        });

        var sb = new StringBuilder();

        sb.Append($"\"item_name\":\"{list[0].Name}\",");
        sb.Append($"\"item_id\":\"{list[0].Code}\",");

        sb.Append($"\"item_name\":\"{list[1].Name}\",");
        sb.Append($"\"item_id\":\"{list[1].Code}\",");

        sb.Append($"\"item_name\":\"{list[2].Name}\",");
        sb.Append($"\"item_id\":\"{list[2].Code}\",");

        return sb.ToString();

In general, you need to handle escaping of special characters, like ". — Stephan Møller, Dec 21 '22 at 13:14
Why build the JSON like this instead of simply serialize the list? — Zohar Peled, Dec 21 '22 at 13:16

Nitin Sawant · Answer 1 · 2022-12-22T13:58:05.457

2

Add reference to Newtonsoft Json.NET library and serialize the list to json

string json = JsonConvert.SerializeObject(list);

edited Dec 22 '22 at 13:58

answered Dec 21 '22 at 14:00

Nitin Sawant

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score 0 · Answer 2 · answered Dec 21 '22 at 15:39

since you are using StringBuilder, " will be Considered as " in the String value just like below

"item_name":"Test1","item_id":"124565123","item_name":"Test2","item_id":"123 "45","item_name":"Test3","item_id":"456",

so , if you want to Convert it to Json , then Json will not Consider value with Double Quote In Between.

Moreover, backslash with double quote ' \" ' suppose to Escape Special Character while Converting to json

I am not sure that you want to Keep that special Character in you Json string If yes then In My Opinion you should try by placing double backslash \\" and Double Quote before your Special Character. and json will Accept it

ex.

\\"45

String builder in c# json problem with \"

2 Answers2