How to apply json-patch to plain json in .net core?

Question

JsonPatchDocument.Apply method works on an object graph, but instead I want to apply a json patch to plain json.

For example, suppose I have this json:

{ "name": "JSON Patch", "text": "OLD" }

How can I apply a patch like this with C#?

[ { "op": "replace", "path": "/text", "value": "NEW VALUE" } ]

How is this done using C# and .NET core?

Thanks for your input. No, in this scenario, it is a Xamarin Forms client that receives a json patch (from an api service) and applies it to a local stored document. — netcoredev, Sep 15 '20 at 23:16

score 8 · Accepted Answer · answered Sep 15 '20 at 01:54

Here is a snippet of code which applies patch:

using System;
using System.Collections.Generic;
                    
public class Program
{
    public static void Main()
    {
        var json="{ \"name\": \"JSON Patch\", \"text\": \"OLD\" }";
        var jsonObj = Newtonsoft.Json.JsonConvert.DeserializeObject(json);
        var operationStrings = "[ { \"op\": \"replace\", \"path\": \"/text\", \"value\": \"NEW VALUE\" } ] ";
        var ops = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Microsoft.AspNetCore.JsonPatch.Operations.Operation>>(operationStrings);
        
        var patchDocument = new Microsoft.AspNetCore.JsonPatch.JsonPatchDocument(ops, new Newtonsoft.Json.Serialization.DefaultContractResolver());
        
        patchDocument.ApplyTo(jsonObj);
        Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(jsonObj));
    }
}

This was very helpful to me today, thank you! – ogg130 Dec 11 '20 at 20:24 — ogg130, Dec 11 '20 at 20:24

How to apply json-patch to plain json in .net core?

1 Answers1