ASP.NET Core 6 : The best way to list a group of numbers in a string?

October 16, 2024

I have a string of numbers in the form of an object like this :

{ "7": "14", "8": "16", "10": "18", "19": "20" }

I want to put the numbers before ":" in a list and the numbers after it in a list, what is the best way to do this?

>Solution :

Working with Newtonsoft.Json, you can convert it to JObject and extract the keys and values via Properties() an Values().

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Linq;

JObject jObj = JObject.Parse(input);
var keys = jObj.Properties()
    .Select(x => x.Name)
    .Where(x => int.TryParse(x, out _))
    .ToList();
var values = jObj.Values()
    .Select(x => x.ToString())
    .Where(x => int.TryParse(x, out _))
    .ToList();

From the Dictionary<string, string> instance, you can work with System.Linq to extract the Key and Value.

using System.Collections.Generic;
using System.Linq;

var dict = /* Dictionary<string, string> instance */;
        
var keys = dict.Select(x => x.Key)
    .Where(x => int.TryParse(x, out _))
    .ToList();
var values = dict.Select(x => x.Value)
    .Where(x => int.TryParse(x, out _))
    .ToList();