String to comma separated array using Newtonsoft

Question

I have an input string like

[{"brand_id":"112"},{"brand_id":"114"},{"brand_id":"14"}]

and I want to convert the string to a format like this using Newtonsoft.

[112,114,14]

Answer 1

Parse input string to JArray, then use .Select() to get value of particular key(in Your case it is brand_id)

using System.Linq;
using Newtonsoft.Json.Linq;
...
//Input string 
string json = @"[{'brand_id':'112'},{'brand_id':'114'},{'brand_id':'14'}]"; 
//Convert input string to JArray
JArray jArray = JArray.Parse(json);
//Select only specific field
var brandIds = jArray.Select(x => x["brand_id"]);

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Try online: C# fiddle

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If you already have model defined for the input string, then you can use DeserializeObject() method which is explained by @YongShun