Question 288394 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Change a list to specific format of JSON

I have a list with each item as:

public class Item
{
    public string Name { get; set; }
    public string Value { get; set; }
}

Imagine the list has two items like below (in fact it can have several items)

Item1 : Name=A / Value=1000

Item2 : Name=B / Value=2000

I want to have a JSON like this:

{
    "Date":"2023-11-19",
    "A":"1000",
    "B":"2000"
}
Tags:

3

Answers


  1. 0

    You can use the .ToDictionary() to convert the list of objects into a key-value pair (Dictionary).

    Based on your output, unsure where is the Date comes from. If the Date is not appeared in the list and you want it to be appeared in the key-value pair, you need to add the Date.

    using System.Linq;

Dictionary<string, string> dictionary = items.ToDictionary(x => x.Name, x => x.Value);

// Add Date attribute
dictionary.Add("Date", $"{DateTime.Now:yyyy-MM-dd}");
    Login or Signup to reply.
  2. 0

    Please find the attached code below :

    using System;
using System.Collections.Generic;
using Newtonsoft.Json;

public class Item
{
    public string Name { get; set; }
    public string Value { get; set; }
}

public class Program
{
     public static void Main()
    {
        // Create a list of Item objects
        List<Item> itemList = new List<Item>
        {
            
            new Item { Name = "A", Value = "1000" },
            new Item { Name = "B", Value = "2000" }
        };
        var additionalProperties = new
        {
            A = "1000",
            B = "2000"
        };
        var mergedObject = new Dictionary<string, string>();
        foreach (var item in itemList)
        {
            mergedObject.Add(item.Name, item.Value);
        }
        mergedObject.Add("Date", "2023-11-19");
        string jsonString = JsonConvert.SerializeObject(mergedObject, Formatting.Indented);
        Console.WriteLine(jsonString);
    }
}

    enter image description here

    Working .Netfiddle here

    Login or Signup to reply.
  3. 0

    To convert a list of Item objects into a JSON format as specified, you can use LINQ and Newtonsoft.Json in C# to achieve this transformation.

    Here’s an example:

    using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;

public class Item
{
    public string Name { get; set; }
    public string Value { get; set; }
}

class Program
{
    static void Main()
    {
        // Assuming you have a list of Item objects
        List<Item> itemList = new List<Item>
        {
            new Item { Name = "A", Value = "1000" },
            new Item { Name = "B", Value = "2000" }
            // Add more items as needed
        };

        // Create a dictionary from the list using ToDictionary
        var dictionary = itemList.ToDictionary(item => item.Name, item => item.Value);

        // Add Date key with current date to the dictionary
        dictionary.Add("Date", DateTime.Now.ToString("yyyy-MM-dd"));

        // Convert the dictionary to JSON
        string jsonResult = JsonConvert.SerializeObject(dictionary, Formatting.Indented);

        Console.WriteLine(jsonResult);
    }
}

    This code first creates a list of Item objects. Then, it transforms this list into a dictionary where the Name property of each Item object becomes a key, and the Value property becomes the value in the dictionary. Additionally, it adds a "Date" key to the dictionary with the current date.

    Finally, it converts the dictionary into a JSON string using Newtonsoft.Json’s SerializeObject method, resulting in the desired JSON format:

    {
  "A": "1000",
  "B": "2000",
  "Date": "2023-11-19"
}

    This output contains the "Date" key along with the keys/values from the Item objects in the desired format.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search