Using JsonPatchDocument With PatchAsync In Blazor Client

Question

In my Blazor Client project, I have the following code:

    @using Microsoft.AspNetCore.JsonPatch

    ...

    var doc = new JsonPatchDocument<Movie>()
         .Replace(o => o.Title, "New Title");

    await Http.PatchAsync("api/patch/" + MovieId, doc);

This won't compile with the following error:

Error CS1503 Argument 2: cannot convert from 'Microsoft.AspNetCore.JsonPatch.JsonPatchDocument' to 'System.Net.Http.HttpContent'

After some research, I've installed Newtonsoft.Json but I'm unsure how to configure the project to use it, or if indeed this is the correct solution for getting JsonPatchDocument working in a Blazor Project?

If JsonPatchDocument is not supported by Blazor, how can I implement a HTTP Patch request?

@enet Thanks for replying, yes I did but that document doesn't describe how a JsonPatchDocument object can be used as the HttpContent parameter, or if such an object is supported within a Blazor Client project. — John Steed
– John Steed, Commented May 23, 2020 at 15:44

benjamin · Accepted Answer · 2020-10-16 13:14:00Z

3

I just had a different but related issue. You are correct that you need to be using Newtonsoft.Json instead of System.Text.Json on the client application. Here is an extension method that will turn your JsonPatchDocument into an HttpContent.

 public static class HttpClientExtensions
 {
     public static async Task<HttpResponseMessage> PatchAsync<T>(this HttpClient client,
     string requestUri,
     JsonPatchDocument<T> patchDocument)
     where T : class
 {
     var writer = new StringWriter();
     var serializer = new JsonSerializer();
     serializer.Serialize(writer, patchDocument);
     var json = writer.ToString();

     var content = new StringContent(json, Encoding.UTF8, "application/json-patch+json");
     return await client.PatchAsync(requestUri, content);
 }

I know it's late but I hope it's helpful.

edited Oct 16, 2020 at 13:14

answered Oct 16, 2020 at 11:49

benjamin

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