Custom string from TextBox in webrequest

Question

i am trying to send a HttpWebRequest with the following body :

string body = "{\"prompt\": \"MyText\",\"n\": 2,\"size\": \"256x256\",\"response_format\":\"b64_json\"}";

the request works perfectly with this body, but everytime i try to change "MyText" with a text from textbox, i get an error 400 from server.

i tried this (return error 400): string body = "{\"prompt\":" +textBox1.Text+",\"n\": 2,\"size\": \"256x256\",\"response_format\":\"b64_json\"}";

any ideas ?

Answer 1

It is not recommended to build your JSON manually as you will highly expose to syntax errors due to missing/extra quotes, braces, etc especially when dealing with complex objects/arrays.

Using the libraries such as System.Text.Json or Newtonsoft.Json for the JSON serialization. This is safer and easier compared to building it manually.

using System.Text.Json;

var obj = new
    {
        prompt = textBox1.Text,
        n = 2,
        size = "256x256",
        response_format = "b64_json"
    };
        
string body = JsonSerializer.Serialize(obj);

using Newtonsoft.Json;
        
string body = JsonConvert.SerializeObject(obj);