Many applications need to return data in a structured format, and JSON (JavaScript object representation) is usually used. JSON is a lightweight data format that is easy to read manually and easy to analyze machine. Although

can be used to manually build a JSON string, but external libraries such as newtonsoft.json can significantly simplify this process.

Newtonsoft.json provides a direct JSON serialization method. The following is a specific step:

product class:

1. Public Class Product {{ public string name {get; set;} public datetime expiry {get; set;} public decimal price {get; set;} public string [] Sizes {get; set;} }

public class Product
{
    public string Name { get; set; }
    public DateTime Expiry { get; set; }
    public decimal Price { get; set; }
    public string[] Sizes { get; set; }
}

use

Product product = new Product();
product.Name = "Apple";
product.Expiry = new DateTime(2008, 12, 28);
product.Price = 3.99M;
product.Sizes = new string[] { "Small", "Medium", "Large" };

3. json variables now include a json string of
Product

string json = JsonConvert.SerializeObject(product);

Newtonsoft.json library provides detailed documents on JSON data serialization and deepertaization. By using this library, you can efficiently handle the creation of the JSON string and achieve flexible data exchange in the C#application.